var-200903-0284
Vulnerability from variot
The (1) Airline Product Set (aka ALPS), (2) Serial Tunnel Code (aka STUN), (3) Block Serial Tunnel Code (aka BSTUN), (4) Native Client Interface Architecture (NCIA) support, (5) Data-link switching (aka DLSw), (6) Remote Source-Route Bridging (RSRB), (7) Point to Point Tunneling Protocol (PPTP), (8) X.25 for Record Boundary Preservation (RBP), (9) X.25 over TCP (XOT), and (10) X.25 Routing features in Cisco IOS 12.2 and 12.4 allows remote attackers to cause a denial of service (device reload) via a series of crafted TCP packets. Cisco IOS Is TCP There is a defect in packet processing, so when one of the following functions is enabled, service operation is interrupted. (DoS) There is a vulnerability that becomes a condition. Multiple features of Cisco IOS (Internetwork Operating System) are prone to a denial-of-service vulnerability when handling specially crafted TCP packets. An attacker can exploit this issue to trigger an affected device to reload, causing denial-of-service conditions. This issue is documented by Cisco Bug ID CSCsr29468. A sequence of specially crafted TCP packets can cause the vulnerable device to reload.
Cisco has released free software updates that address this vulnerability.
Several mitigation strategies are outlined in the workarounds section of this advisory.
This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20090325-tcp.shtml
Note: The March 25, 2009, Cisco IOS Security Advisory bundled publication includes eight Security Advisories. All of the advisories address vulnerabilities in Cisco IOS Software. Each advisory lists the releases that correct the vulnerability or vulnerabilities in the advisory. The following table lists releases that correct all Cisco IOS Software vulnerabilities that have been published in Cisco Security Advisories on March 25, 2009, or earlier.
To determine the Cisco IOS Software release that is running on a Cisco product, administrators can log in to the device and issue the "show version" command to display the system banner. The system banner confirms that the device is running Cisco IOS Software by displaying text similar to "Cisco Internetwork Operating System Software" or "Cisco IOS Software." The image name displays in parentheses, followed by "Version" and the Cisco IOS Software release name. Other Cisco devices do not have the "show version" command or may provide different output.
The following example identifies a Cisco product that is running Cisco IOS Software Release 12.3(26) with an installed image name of C2500-IS-L:
Router#show version
Cisco Internetwork Operating System Software
IOS (tm) 2500 Software (C2500-IS-L), Version 12.3(26), RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2008 by cisco Systems, Inc.
Compiled Mon 17-Mar-08 14:39 by dchih
<output truncated>
The following example shows a product that is running Cisco IOS Software Release 12.4(20)T with an image name of C1841-ADVENTERPRISEK9-M:
Router#show version
Cisco IOS Software, 1841 Software (C1841-ADVENTERPRISEK9-M), Version 12.4(20)T, RELEASE SOFTWARE (fc3)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2008 by Cisco Systems, Inc.
Compiled Thu 10-Jul-08 20:25 by prod_rel_team
<output truncated>
Additional information about Cisco IOS Software release naming conventions is available in "White Paper: Cisco IOS Reference Guide" at the following link: http://www.cisco.com/warp/public/620/1.html .
Products Confirmed Not Vulnerable +--------------------------------
The following product and feature have been confirmed not vulnerable:
- Cisco IOS XR Software
- BGP is not affected
No other Cisco products or features configured within Cisco IOS Software are currently known to be affected by this vulnerability.
Details
Completion of the 3-way handshake to the associated TCP port number (s) of any of the features outlined below is required in order for the vulnerability to be successfully exploited.
Airline Product Set (ALPS) +-------------------------
Devices configured for ALPS are vulnerable. The default TCP listening ports for ALPS are 350 and 10000. The default listening TCP ports for STUN are 1990,1991 1992 and 1994. The default listening TCP ports will be dependent on the protocol used with NCIA, such as RSRB or DSLw. The following examples shows a vulnerable configuration:
ncia server 1 10.66.91.138 0000.1111.2222 2222.2222.2222 1
Further information about NCIA is available in "Cisco IOS Bridging and IBM Networking Configuration Guide, Release 12.4 - Configuring NCIA Client/Server" at the following link http://www.cisco.com/en/US/docs/ios/bridging/configuration/guide/br_ncia_client_svr_ps6350_TSD_Products_Configuration_Guide_Chapter.html
Data-link switching (DLSw) +-------------------------
Devices configured for DLSw are vulnerable. The default listening TCP ports for DSLw are 2065, 2067, 1981, 1982 and 1983. The following example shows a vulnerable configuration:
dlsw local-peer peer-id <ip address>
Devices configured with either FST Encapsulation or Direct Encapsulation are still vulnerable as the affected TCP ports are opened by the "dslw local-peer peer-id ip address" command.
Further information about DLSw is available in "Cisco IOS Bridging and IBM Networking Configuration Guide, Release 12.4 - Configuring Data-Link Switching Plus" at the following link http://www.cisco.com/en/US/docs/ios/bridging/configuration/guide/br_dlsw_plus_ps6350_TSD_Products_Configuration_Guide_Chapter.html
Remote Source-Route Bridging (RSRB) +----------------------------------
Devices configured for RSRB Using IP Encapsulation over a TCP connection are vulnerable. The default listening TCP ports for RSRB are 1996,1987, 1988 and 1989. The following example shows a vulnerable configuration:
source-bridge ring-group 10
source-bridge remote-peer 10 tcp <ip address>
Devices configured with either RSRB Using Direct Encapsulation or RSRB Using IP Encapsulation over an FST Connection are not affected.
Further information about RSRB is available in "Cisco IOS Bridging and IBM Networking Configuration Guide, Release 12.2 - Configuring Remote Source-Route Bridging" at the following link http://www.cisco.com/en/US/docs/ios/12_2/ibm/configuration/guide/bcfrsrb_ps1835_TSD_Products_Configuration_Guide_Chapter.html
Point to Point Tunneling Protocol (PPTP) +---------------------------------------
Devices configured for PPTP are vulnerable. The default listening TCP port for PPTP is 1723. The following examples shows a vulnerable configuration:
vpdn enable
!
vpdn-group pptp
! Default PPTP VPDN group
accept-dialin
protocol pptp
virtual-template 1
Or
vpdn enable
!
vpdn-group L2_Tunneling
! Default L2TP VPDN group
! Default PPTP VPDN group
accept-dialin
protocol any
virtual-template 1
Further information about PPTP is available in "Cisco IOS VPDN Configuration Guide, Release 12.4 - Configuring Client-Initiated Dial-In VPDN Tunneling" at the following link http://www.cisco.com/en/US/docs/ios/vpdn/configuration/guide/client_init_dial-in_ps6350_TSD_Products_Configuration_Guide_Chapter.html#wp1105140
X.25 Record Boundary Preservation (RBP) +--------------------------------------
Devices configured for RBP are vulnerable. The listening TCP port is configured with the "local port port_number" CLI command, as shown in the next examples. The following examples shows vulnerable configurations. The first leverages switched virtual circuits (SVC):
interface Serial1/0
x25 map rbp 1111 local port <port_number>
The second example, leverages a permanent virtual circuit (PVC):
interface Serial1/0
x25 map pvc <pvc_number> rbp local port <port_number>
Further information about RBP is available in "Cisco IOS Wide-Area Networking Configuration Guide, Release 12.4 - X.25 Record Boundary Preservation for Data Communications Networks" at the following link http://www.cisco.com/en/US/docs/ios/wan/configuration/guide/wan_x25_rbp_dcn_ps6350_TSD_Products_Configuration_Guide_Chapter.html
X.25 over TCP (XOT) +------------------
Devices configured for XOT are vulnerable. The default listening TCP port for XOT is 1998. The following example shows a vulnerable configuration.
xot access-group 1
and a corresponding access-list 1.
Further information about XOT is available in "Cisco IOS Wide-Area Networking Configuration Guide, Release 12.4 - X.25 over TCP Profiles" at the following link http://www.cisco.com/en/US/docs/ios/wan/configuration/guide/wan_x25otcp_pro_ps6350_TSD_Products_Configuration_Guide_Chapter.html
X25 Routing +----------
Devices configured with X25 are vulnerable. The default listening TCP port for X25 Routing is 1998. The following example shows a vulnerable configuration.
x25 routing
Further information about X25 is available in "Cisco IOS Wide-Area Networking Configuration Guide, Release 12.4 - Configuring X.25 and LAPB" at the following link http://www.cisco.com/en/US/docs/ios/wan/configuration/guide/wan_cfg_x25_lapb_ps6350_TSD_Products_Configuration_Guide_Chapter.html
This vulnerability is documented in the following Cisco Bug ID: CSCsr29468 and has been assigned the Common Vulnerabilities and Exposures (CVE) identifier CVE-2009-0629.
Vulnerability Scoring Details
Cisco has provided scores for the vulnerability in this advisory based on the Common Vulnerability Scoring System (CVSS). The CVSS scoring in this Security Advisory is done in accordance with CVSS version 2.0.
CVSS is a standards-based scoring method that conveys vulnerability severity and helps determine urgency and priority of response.
Cisco has provided a base and temporal score. Customers can then compute environmental scores to assist in determining the impact of the vulnerability in individual networks.
Cisco has provided an FAQ to answer additional questions regarding CVSS at
http://www.cisco.com/web/about/security/intelligence/cvss-qandas.html
Cisco has also provided a CVSS calculator to help compute the environmental impact for individual networks at
http://intellishield.cisco.com/security/alertmanager/cvss
CSCsr29468: Cisco IOS Software Multiple Features Crafted TCP Sequence Vulnerability
CVSS Base Score - 7.8
Access Vector - Network Access Complexity - Low Authentication - None Confidentiality Impact - None Integrity Impact - None Availability Impact - Complete
CVSS Temporal Score - 6.4
Exploitability - Functional Remediation Level - Official-Fix Report Confidence - Confirmed
Impact
Successful exploitation of this vulnerability will cause the device to reload.
Software Versions and Fixes
When considering software upgrades, also consult http://www.cisco.com/go/psirt and any subsequent advisories to determine exposure and a complete upgrade solution.
In all cases, customers should exercise caution to be certain the devices to be upgraded contain sufficient memory and that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, contact the Cisco Technical Assistance Center (TAC) or your contracted maintenance provider for assistance.
Each row of the Cisco IOS software table (below) names a Cisco IOS release train. If a given release train is vulnerable, then the earliest possible releases that contain the fix (along with the anticipated date of availability for each, if applicable) are listed in the "First Fixed Release" column of the table. The "Recommended Release" column indicates the releases which have fixes for all the published vulnerabilities at the time of this Advisory. A device running a release in the given train that is earlier than the release in a specific column (less than the First Fixed Release) is known to be vulnerable. Cisco recommends upgrading to a release equal to or later than the release in the "Recommended Releases" column of the table.
+-------------------------------------------------------------------+ | Major | Availability of Repaired Releases | | Release | | |------------+------------------------------------------------------| | Affected | | | | 12.0-Based | First Fixed Release | Recommended Release | | Releases | | | |-------------------------------------------------------------------| | There are no affected 12.0 based releases | |-------------------------------------------------------------------| | Affected | | | | 12.1-Based | First Fixed Release | Recommended Release | | Releases | | | |-------------------------------------------------------------------| | There are no affected 12.1 based releases | |-------------------------------------------------------------------| | Affected | | | | 12.2-Based | First Fixed Release | Recommended Release | | Releases | | | |------------+-----------------------------+------------------------| | 12.2 | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2B | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2BC | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2BW | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2BX | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2BY | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2BZ | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2CX | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2CY | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2CZ | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2DA | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2DD | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2DX | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2EW | Vulnerable; first fixed in | 12.2(31)SGA9 | | | 12.2SG | | |------------+-----------------------------+------------------------| | 12.2EWA | Vulnerable; first fixed in | 12.2(31)SGA9 | | | 12.2SG | | |------------+-----------------------------+------------------------| | | Releases prior to 12.2(44) | | | | EX are vulnerable, release | | | 12.2EX | 12.2(44)EX and later are | 12.2(44)SE6 | | | not vulnerable; first fixed | | | | in 12.2SE | | |------------+-----------------------------+------------------------| | 12.2EY | 12.2(44)EY | 12.2(44)SE6 | |------------+-----------------------------+------------------------| | 12.2EZ | Vulnerable; first fixed in | 12.2(44)SE6 | | | 12.2SE | | |------------+-----------------------------+------------------------| | 12.2FX | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2FY | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2FZ | Vulnerable; first fixed in | 12.2(44)SE6 | | | 12.2SE | | |------------+-----------------------------+------------------------| | | Vulnerable; first fixed in | 12.2(33)SRC4; | | 12.2IRA | 12.2SRC | Available on | | | | 18-MAY-2009 | |------------+-----------------------------+------------------------| | | Vulnerable; first fixed in | 12.2(33)SRC4; | | 12.2IRB | 12.2SRC | Available on | | | | 18-MAY-2009 | |------------+-----------------------------+------------------------| | 12.2IXA | Vulnerable; migrate to any | 12.2(18)IXH; Available | | | release in 12.2IXH | on 31-MAR-2009 | |------------+-----------------------------+------------------------| | 12.2IXB | Vulnerable; migrate to any | 12.2(18)IXH; Available | | | release in 12.2IXH | on 31-MAR-2009 | |------------+-----------------------------+------------------------| | 12.2IXC | Vulnerable; migrate to any | 12.2(18)IXH; Available | | | release in 12.2IXH | on 31-MAR-2009 | |------------+-----------------------------+------------------------| | 12.2IXD | Vulnerable; migrate to any | 12.2(18)IXH; Available | | | release in 12.2IXH | on 31-MAR-2009 | |------------+-----------------------------+------------------------| | 12.2IXE | Vulnerable; migrate to any | 12.2(18)IXH; Available | | | release in 12.2IXH | on 31-MAR-2009 | |------------+-----------------------------+------------------------| | 12.2IXF | Vulnerable; migrate to any | 12.2(18)IXH; Available | | | release in 12.2IXH | on 31-MAR-2009 | |------------+-----------------------------+------------------------| | 12.2IXG | Vulnerable; migrate to any | 12.2(18)IXH; Available | | | release in 12.2IXH | on 31-MAR-2009 | |------------+-----------------------------+------------------------| | 12.2JA | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2JK | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2MB | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2MC | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2S | Vulnerable; first fixed in | 12.2(33)SB4 | | | 12.2SB | | |------------+-----------------------------+------------------------| | | 12.2(33)SB3 | | | | | | | 12.2SB | 12.2(28)SB13 | 12.2(33)SB4 | | | | | | | 12.2(31)SB14 | | |------------+-----------------------------+------------------------| | 12.2SBC | Vulnerable; first fixed in | 12.2(33)SB4 | | | 12.2SB | | |------------+-----------------------------+------------------------| | 12.2SCA | Vulnerable; first fixed in | 12.2(33)SCB1 | | | 12.2SCB | | |------------+-----------------------------+------------------------| | 12.2SCB | 12.2(33)SCB1 | 12.2(33)SCB1 | |------------+-----------------------------+------------------------| | | 12.2(46)SE2 | | | | | | | 12.2SE | 12.2(50)SE | 12.2(44)SE6 | | | | | | | 12.2(44)SE5 | | |------------+-----------------------------+------------------------| | 12.2SEA | Vulnerable; first fixed in | 12.2(44)SE6 | | | 12.2SE | | |------------+-----------------------------+------------------------| | 12.2SEB | Vulnerable; first fixed in | 12.2(44)SE6 | | | 12.2SE | | |------------+-----------------------------+------------------------| | 12.2SEC | Vulnerable; first fixed in | 12.2(44)SE6 | | | 12.2SE | | |------------+-----------------------------+------------------------| | 12.2SED | Vulnerable; first fixed in | 12.2(44)SE6 | | | 12.2SE | | |------------+-----------------------------+------------------------| | 12.2SEE | Vulnerable; first fixed in | 12.2(44)SE6 | | | 12.2SE | | |------------+-----------------------------+------------------------| | 12.2SEF | Not Vulnerable | | |------------+-----------------------------+------------------------| | | Releases prior to 12.2(25) | | | | SEG4 are vulnerable, | | | 12.2SEG | release 12.2(25)SEG4 and | 12.2(44)SE6 | | | later are not vulnerable; | | | | first fixed in 12.2SE | | |------------+-----------------------------+------------------------| | 12.2SG | 12.2(50)SG | 12.2(52)SG; Available | | | | on 15-MAY-2009 | |------------+-----------------------------+------------------------| | 12.2SGA | 12.2(31)SGA9 | 12.2(31)SGA9 | |------------+-----------------------------+------------------------| | 12.2SL | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2SM | Vulnerable; contact TAC | | |------------+-----------------------------+------------------------| | 12.2SO | Vulnerable; contact TAC | | |------------+-----------------------------+------------------------| | 12.2SQ | Not Vulnerable | | |------------+-----------------------------+------------------------| | | Vulnerable; first fixed in | 12.2(33)SRC4; | | 12.2SRA | 12.2SRC | Available on | | | | 18-MAY-2009 | |------------+-----------------------------+------------------------| | | | 12.2(33)SRB5a; | | | | Available on | | 12.2SRB | Vulnerable; first fixed in | 3-April-2009 12.2(33) | | | 12.2SRC | SRC4; Available on | | | | 18-MAY-2009 12.2(33) | | | | SRD1 | |------------+-----------------------------+------------------------| | | | 12.2(33)SRC4; | | 12.2SRC | 12.2(33)SRC3 | Available on | | | | 18-MAY-2009 12.2(33) | | | | SRD1 | |------------+-----------------------------+------------------------| | 12.2SRD | 12.2(33)SRD1 | 12.2(33)SRD1 | |------------+-----------------------------+------------------------| | 12.2STE | Vulnerable; contact TAC | | |------------+-----------------------------+------------------------| | 12.2SU | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2SV | Vulnerable; contact TAC | | |------------+-----------------------------+------------------------| | 12.2SVA | Vulnerable; contact TAC | | |------------+-----------------------------+------------------------| | 12.2SVC | Vulnerable; contact TAC | | |------------+-----------------------------+------------------------| | 12.2SVD | Vulnerable; contact TAC | | |------------+-----------------------------+------------------------| | 12.2SVE | Vulnerable; contact TAC | | |------------+-----------------------------+------------------------| | 12.2SW | Vulnerable; migrate to any | | | | release in 12.4SW | | |------------+-----------------------------+------------------------| | 12.2SX | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2SXA | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2SXB | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2SXD | Vulnerable; first fixed in | 12.2(18)SXF16 | | | 12.2SXF | | |------------+-----------------------------+------------------------| | 12.2SXE | Vulnerable; first fixed in | 12.2(18)SXF16 | | | 12.2SXF | | |------------+-----------------------------+------------------------| | 12.2SXF | 12.2(18)SXF16 | 12.2(18)SXF16 | |------------+-----------------------------+------------------------| | | 12.2(33)SXH5; Available on | 12.2(33)SXH5; | | 12.2SXH | 20-APR-2009 | Available on | | | | 20-APR-2009 | |------------+-----------------------------+------------------------| | 12.2SXI | 12.2(33)SXI1 | 12.2(33)SXI1 | |------------+-----------------------------+------------------------| | 12.2SY | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2SZ | Vulnerable; first fixed in | 12.2(33)SB4 | | | 12.2SB | | |------------+-----------------------------+------------------------| | 12.2T | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2TPC | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2XA | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2XB | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2XC | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2XD | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2XE | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2XF | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2XG | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2XH | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2XI | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2XJ | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2XK | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2XL | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2XM | Not Vulnerable | | |------------+-----------------------------+------------------------| | | Vulnerable; first fixed in | 12.2(33)SB4 | | 12.2XN | 12.2SRC | | | | | 12.2(33)SRD1 | |------------+-----------------------------+------------------------| | 12.2XNA | Vulnerable; first fixed in | 12.2(33)SRD1 | | | 12.2SRD | | |------------+-----------------------------+------------------------| | 12.2XNB | 12.2(33)XNB1 | 12.2(33)XNB3 | |------------+-----------------------------+------------------------| | 12.2XNC | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2XO | 12.2(46)XO | 12.2(46)XO | |------------+-----------------------------+------------------------| | 12.2XQ | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2XR | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2XS | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2XT | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2XU | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2XV | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2XW | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2YA | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2YB | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2YC | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2YD | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2YE | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2YF | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2YG | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2YH | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2YJ | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2YK | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2YL | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2YM | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2YN | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2YO | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2YP | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2YQ | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2YR | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2YS | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2YT | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2YU | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2YV | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2YW | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2YX | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2YY | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2YZ | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2ZA | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2ZB | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2ZC | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2ZD | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2ZE | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2ZF | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2ZG | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2ZH | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2ZJ | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2ZL | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.2ZP | Not Vulnerable | | |------------+-----------------------------+------------------------| | | Vulnerable; first fixed in | 12.2(33)SXH5; | | 12.2ZU | 12.2SXH | Available on | | | | 20-APR-2009 | |------------+-----------------------------+------------------------| | 12.2ZX | Vulnerable; first fixed in | 12.2(33)SB4 | | | 12.2SB | | |------------+-----------------------------+------------------------| | 12.2ZY | Vulnerable; contact TAC | | |------------+-----------------------------+------------------------| | 12.2ZYA | 12.2(18)ZYA1 | 12.2(18)ZYA1 | |------------+-----------------------------+------------------------| | Affected | | | | 12.3-Based | First Fixed Release | Recommended Release | | Releases | | | |-------------------------------------------------------------------| | There are no affected 12.3 based releases | |-------------------------------------------------------------------| | Affected | | | | 12.4-Based | First Fixed Release | Recommended Release | | Releases | | | |------------+-----------------------------+------------------------| | 12.4 | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.4JA | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.4JDA | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.4JK | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.4JL | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.4JMA | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.4JMB | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.4JX | Not Vulnerable | | |------------+-----------------------------+------------------------| | | 12.4(15)MD2 | | | | | | | 12.4MD | Releases prior to 12.4(11) | 12.4(11)MD7 | | | MD6 are not vulnerable, | | | | releases 12.4(15)MD and | | | | later are vulnerable. | | |------------+-----------------------------+------------------------| | | 12.4(19)MR1 | | | | | | | 12.4MR | Releases prior to 12.4(16) | 12.4(19)MR2 | | | MR2 are not vulnerable, | | | | releases 12.4(19)MR and | | | | later are vulnerable | | |------------+-----------------------------+------------------------| | 12.4SW | Not Vulnerable | | |------------+-----------------------------+------------------------| | | 12.4(22)T | | | | | 12.4(22)T1 | | 12.4T | 12.4(20)T2 | | | | | 12.4(15)T9; Available | | | Releases prior to 12.4(20)T | on 29-APR-2009 | | | are NOT vulnerable | | |------------+-----------------------------+------------------------| | 12.4XA | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.4XB | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.4XC | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.4XD | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.4XE | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.4XF | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.4XG | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.4XJ | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.4XK | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.4XL | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.4XM | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.4XN | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.4XP | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.4XQ | 12.4(15)XQ2 | 12.4(15)XQ2 | |------------+-----------------------------+------------------------| | | | 12.4(22)T1 | | 12.4XR | 12.4(15)XR4 | | | | | 12.4(15)T9; Available | | | | on 29-APR-2009 | |------------+-----------------------------+------------------------| | 12.4XT | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.4XV | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.4XW | Not Vulnerable | | |------------+-----------------------------+------------------------| | | | 12.4(22)T1 | | 12.4XY | 12.4(15)XY4 | | | | | 12.4(15)T9; Available | | | | on 29-APR-2009 | |------------+-----------------------------+------------------------| | 12.4XZ | 12.4(15)XZ2 | 12.4(15)XZ2 | |------------+-----------------------------+------------------------| | 12.4YA | 12.4(20)YA2 | 12.4(20)YA3 | |------------+-----------------------------+------------------------| | 12.4YB | Not Vulnerable | | |------------+-----------------------------+------------------------| | 12.4YD | Not Vulnerable | | +-------------------------------------------------------------------+
Workarounds
The following mitigations have been identified for this vulnerability, which may help protect an infrastructure until an upgrade to a fixed version of Cisco IOS software can be scheduled:
Infrastructure Access Control Lists +----------------------------------
Although it is often difficult to block traffic that transits a network, it is possible to identify traffic that should never be allowed to target infrastructure devices and block that traffic at the border of networks. Infrastructure Access Control Lists (iACLs) are a network security best practice and should be considered as a long-term addition to good network security as well as a workaround for these specific vulnerabilities. The iACL example below should be included as part of the deployed infrastructure access-list which will protect all devices with IP addresses in the infrastructure IP address range:
!---
!--- Only sections pertaining to features enabled on the device
!--- need be configured.
!---
!--- Feature: ALPS
!---
access-list 150 permit tcp TRUSTED_HOSTS WILDCARD
INFRASTRUCTURE_ADDRESSES WILDCARD eq 350
access-list 150 permit tcp TRUSTED_HOSTS WILDCARD
INFRASTRUCTURE_ADDRESSES WILDCARD eq 10000
!---
!--- Deny ALPS TCP traffic from all other sources destined
!--- to infrastructure addresses.
!---
access-list 150 deny tcp any
INFRASTRUCTURE_ADDRESSES WILDCARD eq 350
access-list 150 deny tcp any
INFRASTRUCTURE_ADDRESSES WILDCARD eq 10000
!---
!--- Feature: STUN
!---
access-list 150 permit tcp TRUSTED_HOSTS WILDCARD
INFRASTRUCTURE_ADDRESSES WILDCARD eq 1994
access-list 150 permit tcp TRUSTED_HOSTS WILDCARD
INFRASTRUCTURE_ADDRESSES WILDCARD range 1990 1992
!---
!--- Deny STUN TCP traffic from all other sources destined
!--- to infrastructure addresses.
!---
access-list 150 deny tcp any
INFRASTRUCTURE_ADDRESSES WILDCARD eq 1994
access-list 150 deny tcp any
INFRASTRUCTURE_ADDRESSES WILDCARD range 1990 1992
!---
!--- Feature: BSTUN
!---
access-list 150 permit tcp TRUSTED_HOSTS WILDCARD
INFRASTRUCTURE_ADDRESSES WILDCARD eq 1963
access-list 150 permit tcp TRUSTED_HOSTS WILDCARD
INFRASTRUCTURE_ADDRESSES WILDCARD range 1976 1979
!---
!--- Deny BSTUN TCP traffic from all other sources destined
!--- to infrastructure addresses.
!---
access-list 150 deny tcp any
INFRASTRUCTURE_ADDRESSES WILDCARD eq 1963
access-list 150 deny tcp any
INFRASTRUCTURE_ADDRESSES WILDCARD range 1976 1979
!---
!--- Feature: NCIA
!---
!---
!--- Leverage the underlying protocols, DLSw, RSRB, etc.
!---
!---
!--- Feature: DLSW
!---
access-list 150 permit tcp TRUSTED_HOSTS WILDCARD
INFRASTRUCTURE_ADDRESSES WILDCARD eq 2065
access-list 150 permit tcp TRUSTED_HOSTS WILDCARD
INFRASTRUCTURE_ADDRESSES WILDCARD eq 2067
access-list 150 permit tcp TRUSTED_HOSTS WILDCARD
INFRASTRUCTURE_ADDRESSES WILDCARD range 1981 1983
!---
!--- Deny DLSW TCP traffic from all other sources destined
!--- to infrastructure addresses.
!---
access-list 150 deny tcp any
INFRASTRUCTURE_ADDRESSES WILDCARD eq 2065
access-list 150 deny tcp any
INFRASTRUCTURE_ADDRESSES WILDCARD eq 2067
access-list 150 deny tcp any
INFRASTRUCTURE_ADDRESSES WILDCARD range 1981 1983
!---
!--- Feature: RSRB
!---
access-list 150 permit tcp TRUSTED_HOSTS WILDCARD
INFRASTRUCTURE_ADDRESSES WILDCARD range 1987 1989
access-list 150 permit tcp TRUSTED_HOSTS WILDCARD
INFRASTRUCTURE_ADDRESSES WILDCARD eq 1996
!---
!--- Deny RSRB TCP traffic from all other sources destined
!--- to infrastructure addresses.
!---
access-list 150 deny tcp any
INFRASTRUCTURE_ADDRESSES WILDCARD range 1987 1989
access-list 150 deny tcp any
INFRASTRUCTURE_ADDRESSES WILDCARD eq 1996
!---
!--- Feature: PPTP
!---
access-list 150 permit tcp TRUSTED_HOSTS WILDCARD
INFRASTRUCTURE_ADDRESSES WILDCARD eq 1723
!---
!--- Deny PPTP TCP traffic from all other sources destined
!--- to infrastructure addresses.
!---
access-list 150 deny tcp any
INFRASTRUCTURE_ADDRESSES WILDCARD eq 1723
!---
!--- Feature: RBP
!---
!--- RBP will listen for TCP connections on the configured port
!--- as per "local port <port_number>". The following example
!--- uses port 1055
!---
access-list 150 permit tcp TRUSTED_HOSTS WILDCARD
INFRASTRUCTURE_ADDRESSES WILDCARD eq 1055
!---
!--- Deny RBP traffic from all other sources destined
!--- to infrastructure addresses.
!---
access-list 150 deny tcp any
INFRASTRUCTURE_ADDRESSES WILDCARD eq 1055
!---
!--- Feature: XOT and X.25 Routing
!---
access-list 150 permit tcp TRUSTED_HOSTS WILDCARD
INFRASTRUCTURE_ADDRESSES WILDCARD eq 1998
!---
!--- Deny XOT and X25 TCP traffic from all other sources
!--- destined to infrastructure addresses.
!---
access-list 150 deny tcp any
INFRASTRUCTURE_ADDRESSES WILDCARD eq 1998
!---
!--- Permit/deny all other Layer 3 and Layer 4 traffic in
!--- accordance with existing security policies and
!--- configurations Permit all other traffic to transit the
!--- device.
!---
access-list 150 permit ip any any
!---
!--- Apply access-list to all interfaces (only one example
!--- shown)
!---
interface serial 2/0
ip access-group 150 in
The white paper entitled "Protecting Your Core: Infrastructure Protection Access Control Lists" presents guidelines and recommended deployment techniques for infrastructure protection access lists. This white paper can be obtained at the following link: http://www.cisco.com/en/US/tech/tk648/tk361/technologies_white_paper09186a00801a1a55.shtml
Receive ACLs (rACL) +------------------
For distributed platforms, Receive ACLs may be an option starting in Cisco IOS Software Versions 12.0(21)S2 for the 12000 (GSR), 12.0(24)S for the 7500, and 12.0(31)S for the 10720. The Receive ACL protects the device from harmful traffic before the traffic can impact the route processor. Receive ACLs are designed to only protect the device on which it is configured. On the 12000, 7500, and 10720, transit traffic is never affected by a receive ACL. Because of this, the destination IP address "any" used in the example ACL entries below only refer to the router's own physical or virtual IP addresses. Receive ACLs are considered a network security best practice, and should be considered as a long-term addition to good network security, as well as a workaround for this specific vulnerability. The white paper entitled "Protecting Your Core: Infrastructure Protection Access Control Lists" presents guidelines and recommended deployment techniques for infrastructure protection access lists. This white paper can be obtained at the following link http://www.cisco.com/en/US/tech/tk648/tk361/technologies_white_paper09186a00801a0a5e.shtml
The following is the receive path ACL written to permit this type of traffic from trusted hosts:
!---
!--- Only sections pertaining to features enabled on the device
!--- need be configured.
!---
!---
!--- Permit ALPS traffic from trusted hosts allowed to the RP.
!---
access-list 150 permit tcp TRUSTED_SOURCE_ADDRESSES WILDCARD
any eq 350
access-list 150 permit tcp TRUSTED_SOURCE_ADDRESSES WILDCARD
any eq 10000
!---
!--- Deny ALPS traffic from all other sources to the RP.
!---
access-list 150 deny tcp any any eq 350
access-list 150 deny tcp any any eq 10000
!---
!--- Permit STUN traffic from trusted hosts allowed to the RP.
!---
access-list 150 permit tcp TRUSTED_SOURCE_ADDRESSES WILDCARD
any eq 1994
access-list 150 permit tcp TRUSTED_SOURCE_ADDRESSES WILDCARD
any range 1990 1992
!---
!--- Deny STUN traffic from all other sources to the RP.
!---
access-list 150 deny tcp any any eq 1994
access-list 150 deny tcp any any eq range 1990 1992
!---
!--- Permit BSTUN traffic from trusted hosts allowed to the RP.
!---
access-list 150 permit tcp TRUSTED_SOURCE_ADDRESSES WILDCARD
any eq 1963
access-list 150 permit tcp TRUSTED_SOURCE_ADDRESSES WILDCARD
any range 1976 1979
!---
!--- Deny BSTUN traffic from all other sources to the RP.
!---
access-list 150 deny tcp any any eq 1963
access-list 150 deny tcp any any eq range 1976 1979
!---
!--- Permit DLSw from trusted hosts allowed to the RP.
!---
access-list 150 permit tcp TRUSTED_SOURCE_ADDRESSES WILDCARD
any eq 2065
access-list 150 permit tcp TRUSTED_SOURCE_ADDRESSES WILDCARD
any eq 2067
access-list 150 permit tcp TRUSTED_SOURCE_ADDRESSES WILDCARD
any range 1981 1983
!---
!--- Deny DLSw all other sources to the RP.
!---
access-list 150 deny tcp any any eq 2065
access-list 150 deny tcp any any eq 2067
access-list 150 deny tcp any any range 1981 1983
!---
!--- Permit RSRB traffic from trusted hosts allowed to the RP.
!---
access-list 150 permit tcp TRUSTED_SOURCE_ADDRESSES WILDCARD
any eq 1996
access-list 150 permit tcp TRUSTED_SOURCE_ADDRESSES WILDCARD
any range 1987 1989
!---
!--- Deny RSRB traffic from all other sources to the RP.
!---
access-list 150 deny tcp any any eq 1996
access-list 150 deny tcp any any range 1987 1989
!---
!--- Permit PPTP traffic from trusted hosts allowed to the RP.
!---
access-list 150 permit tcp TRUSTED_SOURCE_ADDRESSES WILDCARD
any eq 1723
!---
!--- Deny PPTP traffic from all other sources to the RP.
!---
access-list 150 deny tcp any any eq 1723
!---
!--- Permit RBP traffic from trusted hosts allowed to the RP.
!--- RBP will listen for TCP connections on the configured port
!--- as per "local port <port_number>". The following example
!--- uses port 1055
!---
access-list 150 permit tcp TRUSTED_SOURCE_ADDRESSES WILDCARD
any eq 1055
!---
!--- Deny RBP traffic from all other sources to the RP.
!---
access-list 150 deny tcp any any eq 1055
!---
!--- Permit XOT and X.25 Routing traffic from trusted hosts allowed
!--- to the RP.
!---
access-list 150 permit tcp TRUSTED_SOURCE_ADDRESSES WILDCARD
any eq 1998
!---
!--- Deny XOT and X.25 Routing traffic from all other sources to
!--- the RP.
!---
access-list 150 deny tcp any any eq 1998
!--- Permit all other traffic to the RP.
!--- according to security policy and configurations.
access-list 150 permit ip any any
!--- Apply this access list to the 'receive' path.
ip receive access-list 150
Control Plane Policing +---------------------
Control Plane Policing (CoPP) can be used to block the affected features TCP traffic access to the device. Cisco IOS software releases 12.0S, 12.2SX, 12.2S, 12.3T, 12.4, and 12.4T support the CoPP feature. CoPP can be configured on a device to protect the management and control planes and minimize the risk and effectiveness of direct infrastructure attacks by explicitly permitting only authorized traffic that is sent to infrastructure devices in accordance with existing security policies and configurations. The CoPP example below should be included as part of the deployed CoPP that will protect all devices with IP addresses in the infrastructure IP address range.
!---
!--- Only sections pertaining to features enabled on the device
!--- need be configured.
!---
!--- Feature: ALPS
!---
access-list 150 deny tcp TRUSTED_HOSTS WILDCARD any eq 350
access-list 150 deny tcp TRUSTED_HOSTS WILDCARD any eq 10000
!---
!--- Permit ALPS traffic sent to all IP addresses
!--- configured on all interfaces of the affected device so
!--- that it will be policed and dropped by the CoPP feature
!---
access-list 150 permit tcp any any eq 350
access-list 150 permit tcp any any eq 10000
!---
!--- Feature: STUN
!---
access-list 150 deny tcp TRUSTED_HOSTS WILDCARD
any eq 1994
access-list 150 deny tcp TRUSTED_HOSTS WILDCARD
any range 1990 1992
!---
!--- Permit STUN traffic sent to all IP addresses
!--- configured on all interfaces of the affected device so
!--- that it will be policed and dropped by the CoPP feature
!---
access-list 150 permit tcp any any eq 1994
access-list 150 permit tcp any any range 1990 1992
!---
!--- Feature: BSTUN
!---
access-list 150 deny tcp TRUSTED_HOSTS WILDCARD
any eq 1963
access-list 150 deny tcp TRUSTED_HOSTS WILDCARD
any range 1976 1979
!---
!--- Permit BSTUN traffic sent to all IP addresses
!--- configured on all interfaces of the affected device so
!--- that it will be policed and dropped by the CoPP feature
!---
access-list 150 permit tcp any any eq 1963
access-list 150 permit tcp any any range 1976 1979
!---
!--- Feature: NCIA
!---
!--- Leverage the underlying protocols, DLSw, RSRB, etc.
!---
!---
!--- Feature: DLSW
!---
access-list 150 deny tcp TRUSTED_HOSTS WILDCARD
any eq 2065
access-list 150 deny tcp TRUSTED_HOSTS WILDCARD
any eq 2067
access-list 150 deny tcp TRUSTED_HOSTS WILDCARD
any range 1981 1983
!---
!--- Permit DLSW traffic sent to all IP addresses
!--- configured on all interfaces of the affected device so
!--- that it will be policed and dropped by the CoPP feature
!---
access-list 150 permit tcp any any eq 2065
access-list 150 permit tcp any any eq 2067
access-list 150 permit tcp any any range 1981 1983
!---
!--- Feature: RSRB
!---
access-list 150 deny tcp TRUSTED_HOSTS WILDCARD
any range 1987 1989
access-list 150 deny tcp TRUSTED_HOSTS WILDCARD
any eq 1996
!---
!--- Permit RSRB traffic sent to all IP addresses
!--- configured on all interfaces of the affected device so
!--- that it will be policed and dropped by the CoPP feature
!---
access-list 150 permit tcp any any range 1987 1989
access-list 150 permit tcp any any eq 1996
!---
!--- Feature: PPTP
!---
access-list 150 deny tcp TRUSTED_HOSTS WILDCARD
any eq 1723
!---
!--- Permit PPTP traffic sent to all IP addresses
!--- configured on all interfaces of the affected device so
!--- that it will be policed and dropped by the CoPP feature
!---
access-list 150 permit tcp any any eq 1723
!---
!--- Feature: RBP
!---
!--- RBP will listen for TCP connections on the configured port
!--- as per "local port <port_number>". The following example
!--- uses port 1055
access-list 150 deny tcp TRUSTED_HOSTS WILDCARD
any eq 1055
!---
!--- Permit RBP traffic sent to all IP addresses
!--- configured on all interfaces of the affected device so
!--- that it will be policed and dropped by the CoPP feature
!---
access-list 150 permit tcp any any eq 1055
!---
!--- Feature: XOT and X.25 Routing
!---
access-list 150 deny tcp TRUSTED_HOSTS WILDCARD
any eq 1998
!---
!--- Permit XOT and X25 traffic sent to all IP addresses
!--- configured on all interfaces of the affected device so
!--- that it will be policed and dropped by the CoPP feature
!---
access-list 150 permit tcp any any eq 1998
!---
!--- Permit (Police or Drop)/Deny (Allow) all other Layer3 and
!--- Layer4 traffic in accordance with existing security policies
!--- configurations for traffic that is authorized to be sent
!--- and to infrastructure devices
!--- Create a Class-Map for traffic to be policed by
!--- the CoPP feature
!---
class-map match-all drop-tcp-class
match access-group 150
!---
!--- Create a Policy-Map that will be applied to the
!--- Control-Plane of the device.
!---
policy-map drop-tcp-traffic
class drop-tcp-class
drop
!---
!--- Apply the Policy-Map to the
!--- Control-Plane of the device
!---
control-plane
service-policy input drop-tcp-traffic
In the above CoPP example, the access control list entries (ACEs) that match the potential exploit packets with the "permit" action result in these packets being discarded by the policy-map "drop" function, while packets that match the "deny" action (not shown) are not affected by the policy-map drop function. Please note that the policy-map syntax is different in the 12.2S and 12.0S Cisco IOS trains:
policy-map drop-tcp-traffic
class drop-tcp-class
police 32000 1500 1500 conform-action drop exceed-action drop
Additional information on the configuration and use of the CoPP feature can be found in the documents, "Control Plane Policing Implementation Best Practices" and "Cisco IOS Software Releases 12.2S - - Control Plane Policing" at the following links http://www.cisco.com/web/about/security/intelligence/coppwp_gs.html and http://www.cisco.com/en/US/docs/ios/12_3t/12_3t4/feature/guide/gtrtlimt.html
Additional mitigations that can be deployed on Cisco devices within the network are available in the "Cisco Applied Mitigation Bulletin" companion document for this advisory, at the following link http://www.cisco.com/warp/public/707/cisco-amb-20090325-tcp-and-ip.shtml
Obtaining Fixed Software
Cisco has released free software updates that address these vulnerabilities. Prior to deploying software, customers should consult their maintenance provider or check the software for feature set compatibility and known issues specific to their environment.
Customers may only install and expect support for the feature sets they have purchased. By installing, downloading, accessing or otherwise using such software upgrades, customers agree to be bound by the terms of Cisco's software license terms found at http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html, or as otherwise set forth at Cisco.com Downloads at http://www.cisco.com/public/sw-center/sw-usingswc.shtml
Do not contact psirt@cisco.com or security-alert@cisco.com for software upgrades.
Customers with Service Contracts +-------------------------------
Customers with contracts should obtain upgraded software through their regular update channels. For most customers, this means that upgrades should be obtained through the Software Center on Cisco's worldwide website at http://www.cisco.com
Customers using Third Party Support Organizations +------------------------------------------------
Customers whose Cisco products are provided or maintained through prior or existing agreements with third-party support organizations, such as Cisco Partners, authorized resellers, or service providers should contact that support organization for guidance and assistance with the appropriate course of action in regards to this advisory.
The effectiveness of any workaround or fix is dependent on specific customer situations, such as product mix, network topology, traffic behavior, and organizational mission. Due to the variety of affected products and releases, customers should consult with their service provider or support organization to ensure any applied workaround or fix is the most appropriate for use in the intended network before it is deployed.
Customers without Service Contracts +----------------------------------
Customers who purchase direct from Cisco but do not hold a Cisco service contract, and customers who purchase through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should acquire upgrades by contacting the Cisco Technical Assistance Center (TAC). TAC contacts are as follows.
- +1 800 553 2447 (toll free from within North America)
- +1 408 526 7209 (toll call from anywhere in the world)
- e-mail: tac@cisco.com
Customers should have their product serial number available and be prepared to give the URL of this notice as evidence of entitlement to a free upgrade. Free upgrades for non-contract customers must be requested through the TAC.
Refer to http://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html for additional TAC contact information, including localized telephone numbers, and instructions and e-mail addresses for use in various languages.
Exploitation and Public Announcements
The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability described in this advisory.
This vulnerability was found by Cisco internal testing.
Status of this Notice: FINAL
THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.
A stand-alone copy or Paraphrase of the text of this document that omits the distribution URL in the following section is an uncontrolled copy, and may lack important information or contain factual errors.
Distribution
This advisory is posted on Cisco's worldwide website at :
http://www.cisco.com/warp/public/707/cisco-sa-20090325-tcp.shtml
In addition to worldwide web posting, a text version of this notice is clear-signed with the Cisco PSIRT PGP key and is posted to the following e-mail and Usenet news recipients.
- cust-security-announce@cisco.com
- first-bulletins@lists.first.org
- bugtraq@securityfocus.com
- vulnwatch@vulnwatch.org
- cisco@spot.colorado.edu
- cisco-nsp@puck.nether.net
- full-disclosure@lists.grok.org.uk
- comp.dcom.sys.cisco@newsgate.cisco.com
Future updates of this advisory, if any, will be placed on Cisco's worldwide website, but may or may not be actively announced on mailing lists or newsgroups. Users concerned about this problem are encouraged to check the above URL for any updates.
Revision History
+---------------------------------------+ | Revision | | Initial | | 1.0 | 2009-March-25 | public | | | | release | +---------------------------------------+
Cisco Security Procedures
Complete information on reporting security vulnerabilities in Cisco products, obtaining assistance with security incidents, and registering to receive security information from Cisco, is available on Cisco's worldwide website at http://www.cisco.com/en/US/products/products_security_vulnerability_policy.html This includes instructions for press inquiries regarding Cisco security notices. All Cisco security advisories are available at http://www.cisco.com/go/psirt -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.8 (Darwin)
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Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/ . ----------------------------------------------------------------------
Secunia is pleased to announce the release of the annual Secunia report for 2008.
2) An unspecified error exists in the handling of IP sockets, which can be exploited to prevent accepting new connections or sessions, exhaust memory, cause high CPU load, or to cause a reload of an affected device.
4) An unspecified error in the Cisco IOS SCP server (disabled by default) can be exploited to retrieve or write to arbitrary files on the device's file system, regardless of the CLI view configuration.
Successful exploitation of this vulnerability requires valid user access with an attached command-line interface (CLI) view.
5) An unspecified error in the implementation of the Session Initiation Protocol (SIP) can be exploited to reload an affected device via a specially crafted SIP message.
This vulnerability is reported in Cisco IOS with SIP voice services enabled, and which process SIP messages as part of configured VoIP functionality.
SOLUTION: Please see the following vendor advisory for fixed versions. http://www.cisco.com/warp/public/707/cisco-sa-20090325-bundle.shtml
PROVIDED AND/OR DISCOVERED BY: 1, 3, 5 - 9) Reported by the vendor. 2) The vendor also credits Jens Link. 4) The vendor credits Kevin Graham.
ORIGINAL ADVISORY: Cisco: http://www.cisco.com/warp/public/707/cisco-sa-20090325-ctcp.shtml http://www.cisco.com/warp/public/707/cisco-sa-20090325-ip.shtml http://www.cisco.com/warp/public/707/cisco-sa-20090325-mobileip.shtml http://www.cisco.com/warp/public/707/cisco-sa-20090325-scp.shtml http://www.cisco.com/warp/public/707/cisco-sa-20090325-sip.shtml http://www.cisco.com/warp/public/707/cisco-sa-20090325-tcp.shtml http://www.cisco.com/warp/public/707/cisco-sa-20090325-udp.shtml http://www.cisco.com/warp/public/707/cisco-sa-20090325-webvpn.shtml
OTHER REFERENCES: http://www.cisco.com/warp/public/707/cisco-amb-20090325-sip-and-udp.shtml http://www.cisco.com/warp/public/707/cisco-amb-20090325-ctcp.shtml
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"https://www.variotdbs.pl/ref/description#", "sources": { "@container": "@list", "@context": { "@vocab": "https://www.variotdbs.pl/ref/sources#" } } }, "data": "The (1) Airline Product Set (aka ALPS), (2) Serial Tunnel Code (aka STUN), (3) Block Serial Tunnel Code (aka BSTUN), (4) Native Client Interface Architecture (NCIA) support, (5) Data-link switching (aka DLSw), (6) Remote Source-Route Bridging (RSRB), (7) Point to Point Tunneling Protocol (PPTP), (8) X.25 for Record Boundary Preservation (RBP), (9) X.25 over TCP (XOT), and (10) X.25 Routing features in Cisco IOS 12.2 and 12.4 allows remote attackers to cause a denial of service (device reload) via a series of crafted TCP packets. Cisco IOS Is TCP There is a defect in packet processing, so when one of the following functions is enabled, service operation is interrupted. (DoS) There is a vulnerability that becomes a condition. Multiple features of Cisco IOS (Internetwork Operating System) are prone to a denial-of-service vulnerability when handling specially crafted TCP packets. \nAn attacker can exploit this issue to trigger an affected device to reload, causing denial-of-service conditions. \nThis issue is documented by Cisco Bug ID CSCsr29468. A sequence of specially crafted TCP\npackets can cause the vulnerable device to reload. \n\nCisco has released free software updates that address this\nvulnerability. \n\nSeveral mitigation strategies are outlined in the workarounds section\nof this advisory. \n\nThis advisory is posted at \nhttp://www.cisco.com/warp/public/707/cisco-sa-20090325-tcp.shtml\n\nNote: The March 25, 2009, Cisco IOS Security Advisory bundled\npublication includes eight Security Advisories. All of the advisories\naddress vulnerabilities in Cisco IOS Software. Each advisory lists\nthe releases that correct the vulnerability or vulnerabilities in the\nadvisory. The following table lists releases that correct all Cisco\nIOS Software vulnerabilities that have been published in Cisco\nSecurity Advisories on March 25, 2009, or earlier. \n\nTo determine the Cisco IOS Software release that is running on a\nCisco product, administrators can log in to the device and issue the\n\"show version\" command to display the system banner. The system\nbanner confirms that the device is running Cisco IOS Software by\ndisplaying text similar to \"Cisco Internetwork Operating System\nSoftware\" or \"Cisco IOS Software.\" The image name displays in\nparentheses, followed by \"Version\" and the Cisco IOS Software release\nname. Other Cisco devices do not have the \"show version\" command or\nmay provide different output. \n\nThe following example identifies a Cisco product that is running\nCisco IOS Software Release 12.3(26) with an installed image name of\nC2500-IS-L:\n\n Router#show version\n Cisco Internetwork Operating System Software\n IOS (tm) 2500 Software (C2500-IS-L), Version 12.3(26), RELEASE SOFTWARE (fc2)\n Technical Support: http://www.cisco.com/techsupport\n Copyright (c) 1986-2008 by cisco Systems, Inc. \n Compiled Mon 17-Mar-08 14:39 by dchih\n\n \u003coutput truncated\u003e\n\nThe following example shows a product that is running Cisco IOS\nSoftware Release 12.4(20)T with an image name of\nC1841-ADVENTERPRISEK9-M:\n\n Router#show version\n Cisco IOS Software, 1841 Software (C1841-ADVENTERPRISEK9-M), Version 12.4(20)T, RELEASE SOFTWARE (fc3)\n Technical Support: http://www.cisco.com/techsupport\n Copyright (c) 1986-2008 by Cisco Systems, Inc. \n Compiled Thu 10-Jul-08 20:25 by prod_rel_team\n\n \u003coutput truncated\u003e\n\nAdditional information about Cisco IOS Software release naming\nconventions is available in \"White Paper: Cisco IOS Reference Guide\"\nat the following link: http://www.cisco.com/warp/public/620/1.html . \n\nProducts Confirmed Not Vulnerable\n+--------------------------------\n\nThe following product and feature have been confirmed not vulnerable:\n\n * Cisco IOS XR Software\n * BGP is not affected\n\nNo other Cisco products or features configured within Cisco IOS\nSoftware are currently known to be affected by this vulnerability. \n\nDetails\n=======\n\nCompletion of the 3-way handshake to the associated TCP port number\n(s) of any of the features outlined below is required in order for\nthe vulnerability to be successfully exploited. \n\nAirline Product Set (ALPS)\n+-------------------------\n\nDevices configured for ALPS are vulnerable. The default TCP listening\nports for ALPS are 350 and 10000. The\ndefault listening TCP ports for STUN are 1990,1991 1992 and 1994. The default listening TCP ports will be\ndependent on the protocol used with NCIA, such as RSRB or DSLw. The\nfollowing examples shows a vulnerable configuration:\n\n ncia server 1 10.66.91.138 0000.1111.2222 2222.2222.2222 1\n\nFurther information about NCIA is available in \"Cisco IOS Bridging\nand IBM Networking Configuration Guide, Release 12.4 - Configuring\nNCIA Client/Server\" at the following link \nhttp://www.cisco.com/en/US/docs/ios/bridging/configuration/guide/br_ncia_client_svr_ps6350_TSD_Products_Configuration_Guide_Chapter.html\n\nData-link switching (DLSw)\n+-------------------------\n\nDevices configured for DLSw are vulnerable. The default listening TCP\nports for DSLw are 2065, 2067, 1981, 1982 and 1983. The following\nexample shows a vulnerable configuration:\n\n dlsw local-peer peer-id \u003cip address\u003e\n\nDevices configured with either FST Encapsulation or Direct\nEncapsulation are still vulnerable as the affected TCP ports are\nopened by the \"dslw local-peer peer-id ip address\" command. \n\nFurther information about DLSw is available in \"Cisco IOS Bridging\nand IBM Networking Configuration Guide, Release 12.4 - Configuring\nData-Link Switching Plus\" at the following link \nhttp://www.cisco.com/en/US/docs/ios/bridging/configuration/guide/br_dlsw_plus_ps6350_TSD_Products_Configuration_Guide_Chapter.html\n\nRemote Source-Route Bridging (RSRB)\n+----------------------------------\n\nDevices configured for RSRB Using IP Encapsulation over a TCP\nconnection are vulnerable. The default listening TCP ports for RSRB\nare 1996,1987, 1988 and 1989. The following example shows a\nvulnerable configuration:\n\n source-bridge ring-group 10\n source-bridge remote-peer 10 tcp \u003cip address\u003e\n\nDevices configured with either RSRB Using Direct Encapsulation or\nRSRB Using IP Encapsulation over an FST Connection are not affected. \n\nFurther information about RSRB is available in \"Cisco IOS Bridging\nand IBM Networking Configuration Guide, Release 12.2 - Configuring\nRemote Source-Route Bridging\" at the following link \nhttp://www.cisco.com/en/US/docs/ios/12_2/ibm/configuration/guide/bcfrsrb_ps1835_TSD_Products_Configuration_Guide_Chapter.html\n\nPoint to Point Tunneling Protocol (PPTP)\n+---------------------------------------\n\nDevices configured for PPTP are vulnerable. The default listening TCP\nport for PPTP is 1723. The following examples shows a vulnerable\nconfiguration:\n\n vpdn enable\n !\n vpdn-group pptp\n ! Default PPTP VPDN group\n accept-dialin\n protocol pptp\n virtual-template 1\n\nOr\n\n vpdn enable\n !\n vpdn-group L2_Tunneling\n ! Default L2TP VPDN group\n ! Default PPTP VPDN group\n accept-dialin\n protocol any\n virtual-template 1\n\nFurther information about PPTP is available in \"Cisco IOS VPDN\nConfiguration Guide, Release 12.4 - Configuring Client-Initiated\nDial-In VPDN Tunneling\" at the following link \nhttp://www.cisco.com/en/US/docs/ios/vpdn/configuration/guide/client_init_dial-in_ps6350_TSD_Products_Configuration_Guide_Chapter.html#wp1105140\n\nX.25 Record Boundary Preservation (RBP)\n+--------------------------------------\n\nDevices configured for RBP are vulnerable. The listening TCP port is\nconfigured with the \"local port port_number\" CLI command, as shown in\nthe next examples. The following examples shows vulnerable\nconfigurations. The first leverages switched virtual circuits (SVC):\n\n interface Serial1/0\n x25 map rbp 1111 local port \u003cport_number\u003e\n\nThe second example, leverages a permanent virtual circuit (PVC):\n\n interface Serial1/0\n x25 map pvc \u003cpvc_number\u003e rbp local port \u003cport_number\u003e\n\nFurther information about RBP is available in \"Cisco IOS Wide-Area\nNetworking Configuration Guide, Release 12.4 - X.25 Record Boundary\nPreservation for Data Communications Networks\" at the following link\nhttp://www.cisco.com/en/US/docs/ios/wan/configuration/guide/wan_x25_rbp_dcn_ps6350_TSD_Products_Configuration_Guide_Chapter.html\n\nX.25 over TCP (XOT)\n+------------------\n\nDevices configured for XOT are vulnerable. The default listening TCP\nport for XOT is 1998. The following example shows a vulnerable\nconfiguration. \n\n xot access-group 1\n\n and a corresponding access-list 1. \n\nFurther information about XOT is available in \"Cisco IOS Wide-Area\nNetworking Configuration Guide, Release 12.4 - X.25 over TCP\nProfiles\" at the following link \nhttp://www.cisco.com/en/US/docs/ios/wan/configuration/guide/wan_x25otcp_pro_ps6350_TSD_Products_Configuration_Guide_Chapter.html\n\nX25 Routing\n+----------\n\nDevices configured with X25 are vulnerable. The default listening TCP\nport for X25 Routing is 1998. The following example shows a\nvulnerable configuration. \n\n x25 routing\n\nFurther information about X25 is available in \"Cisco IOS Wide-Area\nNetworking Configuration Guide, Release 12.4 - Configuring X.25 and\nLAPB\" at the following link \nhttp://www.cisco.com/en/US/docs/ios/wan/configuration/guide/wan_cfg_x25_lapb_ps6350_TSD_Products_Configuration_Guide_Chapter.html\n\nThis vulnerability is documented in the following Cisco Bug ID:\nCSCsr29468 and has been assigned the Common Vulnerabilities and \nExposures (CVE) identifier CVE-2009-0629. \n\nVulnerability Scoring Details\n=============================\n\nCisco has provided scores for the vulnerability in this advisory\nbased on the Common Vulnerability Scoring System (CVSS). The CVSS\nscoring in this Security Advisory is done in accordance with CVSS\nversion 2.0. \n\nCVSS is a standards-based scoring method that conveys vulnerability\nseverity and helps determine urgency and priority of response. \n\nCisco has provided a base and temporal score. Customers can then\ncompute environmental scores to assist in determining the impact of\nthe vulnerability in individual networks. \n\nCisco has provided an FAQ to answer additional questions regarding\nCVSS at\n\nhttp://www.cisco.com/web/about/security/intelligence/cvss-qandas.html\n\nCisco has also provided a CVSS calculator to help compute the\nenvironmental impact for individual networks at\n\nhttp://intellishield.cisco.com/security/alertmanager/cvss\n\nCSCsr29468: Cisco IOS Software Multiple Features Crafted TCP Sequence\n Vulnerability\n\nCVSS Base Score - 7.8\n\n Access Vector - Network\n Access Complexity - Low\n Authentication - None\n Confidentiality Impact - None\n Integrity Impact - None\n Availability Impact - Complete\n\nCVSS Temporal Score - 6.4\n\n Exploitability - Functional\n Remediation Level - Official-Fix\n Report Confidence - Confirmed\n\nImpact\n======\n\nSuccessful exploitation of this vulnerability will cause the device\nto reload. \n\nSoftware Versions and Fixes\n===========================\n\nWhen considering software upgrades, also consult \nhttp://www.cisco.com/go/psirt and any subsequent advisories to \ndetermine exposure and a complete upgrade solution. \n\nIn all cases, customers should exercise caution to be certain the\ndevices to be upgraded contain sufficient memory and that current\nhardware and software configurations will continue to be supported\nproperly by the new release. If the information is not clear, contact\nthe Cisco Technical Assistance Center (TAC) or your contracted\nmaintenance provider for assistance. \n\nEach row of the Cisco IOS software table (below) names a Cisco IOS\nrelease train. If a given release train is vulnerable, then the\nearliest possible releases that contain the fix (along with the\nanticipated date of availability for each, if applicable) are listed\nin the \"First Fixed Release\" column of the table. The \"Recommended\nRelease\" column indicates the releases which have fixes for all the\npublished vulnerabilities at the time of this Advisory. A device\nrunning a release in the given train that is earlier than the release\nin a specific column (less than the First Fixed Release) is known to\nbe vulnerable. Cisco recommends upgrading to a release equal to or\nlater than the release in the \"Recommended Releases\" column of the\ntable. \n\n+-------------------------------------------------------------------+\n| Major | Availability of Repaired Releases |\n| Release | |\n|------------+------------------------------------------------------|\n| Affected | | |\n| 12.0-Based | First Fixed Release | Recommended Release |\n| Releases | | |\n|-------------------------------------------------------------------|\n| There are no affected 12.0 based releases |\n|-------------------------------------------------------------------|\n| Affected | | |\n| 12.1-Based | First Fixed Release | Recommended Release |\n| Releases | | |\n|-------------------------------------------------------------------|\n| There are no affected 12.1 based releases |\n|-------------------------------------------------------------------|\n| Affected | | |\n| 12.2-Based | First Fixed Release | Recommended Release |\n| Releases | | |\n|------------+-----------------------------+------------------------|\n| 12.2 | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2B | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2BC | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2BW | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2BX | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2BY | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2BZ | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2CX | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2CY | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2CZ | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2DA | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2DD | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2DX | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2EW | Vulnerable; first fixed in | 12.2(31)SGA9 |\n| | 12.2SG | |\n|------------+-----------------------------+------------------------|\n| 12.2EWA | Vulnerable; first fixed in | 12.2(31)SGA9 |\n| | 12.2SG | |\n|------------+-----------------------------+------------------------|\n| | Releases prior to 12.2(44) | |\n| | EX are vulnerable, release | |\n| 12.2EX | 12.2(44)EX and later are | 12.2(44)SE6 |\n| | not vulnerable; first fixed | |\n| | in 12.2SE | |\n|------------+-----------------------------+------------------------|\n| 12.2EY | 12.2(44)EY | 12.2(44)SE6 |\n|------------+-----------------------------+------------------------|\n| 12.2EZ | Vulnerable; first fixed in | 12.2(44)SE6 |\n| | 12.2SE | |\n|------------+-----------------------------+------------------------|\n| 12.2FX | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2FY | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2FZ | Vulnerable; first fixed in | 12.2(44)SE6 |\n| | 12.2SE | |\n|------------+-----------------------------+------------------------|\n| | Vulnerable; first fixed in | 12.2(33)SRC4; |\n| 12.2IRA | 12.2SRC | Available on |\n| | | 18-MAY-2009 |\n|------------+-----------------------------+------------------------|\n| | Vulnerable; first fixed in | 12.2(33)SRC4; |\n| 12.2IRB | 12.2SRC | Available on |\n| | | 18-MAY-2009 |\n|------------+-----------------------------+------------------------|\n| 12.2IXA | Vulnerable; migrate to any | 12.2(18)IXH; Available |\n| | release in 12.2IXH | on 31-MAR-2009 |\n|------------+-----------------------------+------------------------|\n| 12.2IXB | Vulnerable; migrate to any | 12.2(18)IXH; Available |\n| | release in 12.2IXH | on 31-MAR-2009 |\n|------------+-----------------------------+------------------------|\n| 12.2IXC | Vulnerable; migrate to any | 12.2(18)IXH; Available |\n| | release in 12.2IXH | on 31-MAR-2009 |\n|------------+-----------------------------+------------------------|\n| 12.2IXD | Vulnerable; migrate to any | 12.2(18)IXH; Available |\n| | release in 12.2IXH | on 31-MAR-2009 |\n|------------+-----------------------------+------------------------|\n| 12.2IXE | Vulnerable; migrate to any | 12.2(18)IXH; Available |\n| | release in 12.2IXH | on 31-MAR-2009 |\n|------------+-----------------------------+------------------------|\n| 12.2IXF | Vulnerable; migrate to any | 12.2(18)IXH; Available |\n| | release in 12.2IXH | on 31-MAR-2009 |\n|------------+-----------------------------+------------------------|\n| 12.2IXG | Vulnerable; migrate to any | 12.2(18)IXH; Available |\n| | release in 12.2IXH | on 31-MAR-2009 |\n|------------+-----------------------------+------------------------|\n| 12.2JA | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2JK | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2MB | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2MC | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2S | Vulnerable; first fixed in | 12.2(33)SB4 |\n| | 12.2SB | |\n|------------+-----------------------------+------------------------|\n| | 12.2(33)SB3 | |\n| | | |\n| 12.2SB | 12.2(28)SB13 | 12.2(33)SB4 |\n| | | |\n| | 12.2(31)SB14 | |\n|------------+-----------------------------+------------------------|\n| 12.2SBC | Vulnerable; first fixed in | 12.2(33)SB4 |\n| | 12.2SB | |\n|------------+-----------------------------+------------------------|\n| 12.2SCA | Vulnerable; first fixed in | 12.2(33)SCB1 |\n| | 12.2SCB | |\n|------------+-----------------------------+------------------------|\n| 12.2SCB | 12.2(33)SCB1 | 12.2(33)SCB1 |\n|------------+-----------------------------+------------------------|\n| | 12.2(46)SE2 | |\n| | | |\n| 12.2SE | 12.2(50)SE | 12.2(44)SE6 |\n| | | |\n| | 12.2(44)SE5 | |\n|------------+-----------------------------+------------------------|\n| 12.2SEA | Vulnerable; first fixed in | 12.2(44)SE6 |\n| | 12.2SE | |\n|------------+-----------------------------+------------------------|\n| 12.2SEB | Vulnerable; first fixed in | 12.2(44)SE6 |\n| | 12.2SE | |\n|------------+-----------------------------+------------------------|\n| 12.2SEC | Vulnerable; first fixed in | 12.2(44)SE6 |\n| | 12.2SE | |\n|------------+-----------------------------+------------------------|\n| 12.2SED | Vulnerable; first fixed in | 12.2(44)SE6 |\n| | 12.2SE | |\n|------------+-----------------------------+------------------------|\n| 12.2SEE | Vulnerable; first fixed in | 12.2(44)SE6 |\n| | 12.2SE | |\n|------------+-----------------------------+------------------------|\n| 12.2SEF | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| | Releases prior to 12.2(25) | |\n| | SEG4 are vulnerable, | |\n| 12.2SEG | release 12.2(25)SEG4 and | 12.2(44)SE6 |\n| | later are not vulnerable; | |\n| | first fixed in 12.2SE | |\n|------------+-----------------------------+------------------------|\n| 12.2SG | 12.2(50)SG | 12.2(52)SG; Available |\n| | | on 15-MAY-2009 |\n|------------+-----------------------------+------------------------|\n| 12.2SGA | 12.2(31)SGA9 | 12.2(31)SGA9 |\n|------------+-----------------------------+------------------------|\n| 12.2SL | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2SM | Vulnerable; contact TAC | |\n|------------+-----------------------------+------------------------|\n| 12.2SO | Vulnerable; contact TAC | |\n|------------+-----------------------------+------------------------|\n| 12.2SQ | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| | Vulnerable; first fixed in | 12.2(33)SRC4; |\n| 12.2SRA | 12.2SRC | Available on |\n| | | 18-MAY-2009 |\n|------------+-----------------------------+------------------------|\n| | | 12.2(33)SRB5a; |\n| | | Available on |\n| 12.2SRB | Vulnerable; first fixed in | 3-April-2009 12.2(33) |\n| | 12.2SRC | SRC4; Available on |\n| | | 18-MAY-2009 12.2(33) |\n| | | SRD1 |\n|------------+-----------------------------+------------------------|\n| | | 12.2(33)SRC4; |\n| 12.2SRC | 12.2(33)SRC3 | Available on |\n| | | 18-MAY-2009 12.2(33) |\n| | | SRD1 |\n|------------+-----------------------------+------------------------|\n| 12.2SRD | 12.2(33)SRD1 | 12.2(33)SRD1 |\n|------------+-----------------------------+------------------------|\n| 12.2STE | Vulnerable; contact TAC | |\n|------------+-----------------------------+------------------------|\n| 12.2SU | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2SV | Vulnerable; contact TAC | |\n|------------+-----------------------------+------------------------|\n| 12.2SVA | Vulnerable; contact TAC | |\n|------------+-----------------------------+------------------------|\n| 12.2SVC | Vulnerable; contact TAC | |\n|------------+-----------------------------+------------------------|\n| 12.2SVD | Vulnerable; contact TAC | |\n|------------+-----------------------------+------------------------|\n| 12.2SVE | Vulnerable; contact TAC | |\n|------------+-----------------------------+------------------------|\n| 12.2SW | Vulnerable; migrate to any | |\n| | release in 12.4SW | |\n|------------+-----------------------------+------------------------|\n| 12.2SX | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2SXA | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2SXB | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2SXD | Vulnerable; first fixed in | 12.2(18)SXF16 |\n| | 12.2SXF | |\n|------------+-----------------------------+------------------------|\n| 12.2SXE | Vulnerable; first fixed in | 12.2(18)SXF16 |\n| | 12.2SXF | |\n|------------+-----------------------------+------------------------|\n| 12.2SXF | 12.2(18)SXF16 | 12.2(18)SXF16 |\n|------------+-----------------------------+------------------------|\n| | 12.2(33)SXH5; Available on | 12.2(33)SXH5; |\n| 12.2SXH | 20-APR-2009 | Available on |\n| | | 20-APR-2009 |\n|------------+-----------------------------+------------------------|\n| 12.2SXI | 12.2(33)SXI1 | 12.2(33)SXI1 |\n|------------+-----------------------------+------------------------|\n| 12.2SY | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2SZ | Vulnerable; first fixed in | 12.2(33)SB4 |\n| | 12.2SB | |\n|------------+-----------------------------+------------------------|\n| 12.2T | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2TPC | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2XA | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2XB | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2XC | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2XD | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2XE | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2XF | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2XG | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2XH | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2XI | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2XJ | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2XK | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2XL | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2XM | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| | Vulnerable; first fixed in | 12.2(33)SB4 |\n| 12.2XN | 12.2SRC | |\n| | | 12.2(33)SRD1 |\n|------------+-----------------------------+------------------------|\n| 12.2XNA | Vulnerable; first fixed in | 12.2(33)SRD1 |\n| | 12.2SRD | |\n|------------+-----------------------------+------------------------|\n| 12.2XNB | 12.2(33)XNB1 | 12.2(33)XNB3 |\n|------------+-----------------------------+------------------------|\n| 12.2XNC | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2XO | 12.2(46)XO | 12.2(46)XO |\n|------------+-----------------------------+------------------------|\n| 12.2XQ | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2XR | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2XS | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2XT | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2XU | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2XV | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2XW | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2YA | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2YB | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2YC | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2YD | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2YE | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2YF | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2YG | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2YH | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2YJ | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2YK | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2YL | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2YM | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2YN | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2YO | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2YP | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2YQ | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2YR | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2YS | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2YT | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2YU | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2YV | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2YW | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2YX | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2YY | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2YZ | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2ZA | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2ZB | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2ZC | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2ZD | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2ZE | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2ZF | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2ZG | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2ZH | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2ZJ | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2ZL | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.2ZP | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| | Vulnerable; first fixed in | 12.2(33)SXH5; |\n| 12.2ZU | 12.2SXH | Available on |\n| | | 20-APR-2009 |\n|------------+-----------------------------+------------------------|\n| 12.2ZX | Vulnerable; first fixed in | 12.2(33)SB4 |\n| | 12.2SB | |\n|------------+-----------------------------+------------------------|\n| 12.2ZY | Vulnerable; contact TAC | |\n|------------+-----------------------------+------------------------|\n| 12.2ZYA | 12.2(18)ZYA1 | 12.2(18)ZYA1 |\n|------------+-----------------------------+------------------------|\n| Affected | | |\n| 12.3-Based | First Fixed Release | Recommended Release |\n| Releases | | |\n|-------------------------------------------------------------------|\n| There are no affected 12.3 based releases |\n|-------------------------------------------------------------------|\n| Affected | | |\n| 12.4-Based | First Fixed Release | Recommended Release |\n| Releases | | |\n|------------+-----------------------------+------------------------|\n| 12.4 | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.4JA | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.4JDA | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.4JK | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.4JL | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.4JMA | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.4JMB | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.4JX | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| | 12.4(15)MD2 | |\n| | | |\n| 12.4MD | Releases prior to 12.4(11) | 12.4(11)MD7 |\n| | MD6 are not vulnerable, | |\n| | releases 12.4(15)MD and | |\n| | later are vulnerable. | |\n|------------+-----------------------------+------------------------|\n| | 12.4(19)MR1 | |\n| | | |\n| 12.4MR | Releases prior to 12.4(16) | 12.4(19)MR2 |\n| | MR2 are not vulnerable, | |\n| | releases 12.4(19)MR and | |\n| | later are vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.4SW | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| | 12.4(22)T | |\n| | | 12.4(22)T1 |\n| 12.4T | 12.4(20)T2 | |\n| | | 12.4(15)T9; Available |\n| | Releases prior to 12.4(20)T | on 29-APR-2009 |\n| | are NOT vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.4XA | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.4XB | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.4XC | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.4XD | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.4XE | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.4XF | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.4XG | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.4XJ | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.4XK | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.4XL | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.4XM | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.4XN | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.4XP | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.4XQ | 12.4(15)XQ2 | 12.4(15)XQ2 |\n|------------+-----------------------------+------------------------|\n| | | 12.4(22)T1 |\n| 12.4XR | 12.4(15)XR4 | |\n| | | 12.4(15)T9; Available |\n| | | on 29-APR-2009 |\n|------------+-----------------------------+------------------------|\n| 12.4XT | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.4XV | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.4XW | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| | | 12.4(22)T1 |\n| 12.4XY | 12.4(15)XY4 | |\n| | | 12.4(15)T9; Available |\n| | | on 29-APR-2009 |\n|------------+-----------------------------+------------------------|\n| 12.4XZ | 12.4(15)XZ2 | 12.4(15)XZ2 |\n|------------+-----------------------------+------------------------|\n| 12.4YA | 12.4(20)YA2 | 12.4(20)YA3 |\n|------------+-----------------------------+------------------------|\n| 12.4YB | Not Vulnerable | |\n|------------+-----------------------------+------------------------|\n| 12.4YD | Not Vulnerable | |\n+-------------------------------------------------------------------+\n\nWorkarounds\n===========\n\nThe following mitigations have been identified for this\nvulnerability, which may help protect an infrastructure until an\nupgrade to a fixed version of Cisco IOS software can be scheduled:\n\nInfrastructure Access Control Lists\n+----------------------------------\n\nAlthough it is often difficult to block traffic that transits a\nnetwork, it is possible to identify traffic that should never be\nallowed to target infrastructure devices and block that traffic at\nthe border of networks. Infrastructure Access Control Lists (iACLs)\nare a network security best practice and should be considered as a\nlong-term addition to good network security as well as a workaround\nfor these specific vulnerabilities. The iACL example below should be\nincluded as part of the deployed infrastructure access-list which\nwill protect all devices with IP addresses in the infrastructure IP\naddress range:\n\n\n !---\n !--- Only sections pertaining to features enabled on the device\n !--- need be configured. \n !---\n !--- Feature: ALPS\n !---\n\n access-list 150 permit tcp TRUSTED_HOSTS WILDCARD\n INFRASTRUCTURE_ADDRESSES WILDCARD eq 350\n access-list 150 permit tcp TRUSTED_HOSTS WILDCARD\n INFRASTRUCTURE_ADDRESSES WILDCARD eq 10000\n\n !---\n !--- Deny ALPS TCP traffic from all other sources destined\n !--- to infrastructure addresses. \n !---\n\n access-list 150 deny tcp any\n INFRASTRUCTURE_ADDRESSES WILDCARD eq 350\n access-list 150 deny tcp any\n INFRASTRUCTURE_ADDRESSES WILDCARD eq 10000\n\n !---\n !--- Feature: STUN\n !---\n\n access-list 150 permit tcp TRUSTED_HOSTS WILDCARD\n INFRASTRUCTURE_ADDRESSES WILDCARD eq 1994\n access-list 150 permit tcp TRUSTED_HOSTS WILDCARD\n INFRASTRUCTURE_ADDRESSES WILDCARD range 1990 1992\n\n !---\n !--- Deny STUN TCP traffic from all other sources destined\n !--- to infrastructure addresses. \n !---\n\n access-list 150 deny tcp any\n INFRASTRUCTURE_ADDRESSES WILDCARD eq 1994\n access-list 150 deny tcp any\n INFRASTRUCTURE_ADDRESSES WILDCARD range 1990 1992\n\n !---\n !--- Feature: BSTUN\n !---\n\n access-list 150 permit tcp TRUSTED_HOSTS WILDCARD\n INFRASTRUCTURE_ADDRESSES WILDCARD eq 1963\n access-list 150 permit tcp TRUSTED_HOSTS WILDCARD\n INFRASTRUCTURE_ADDRESSES WILDCARD range 1976 1979\n\n !---\n !--- Deny BSTUN TCP traffic from all other sources destined\n !--- to infrastructure addresses. \n !---\n\n access-list 150 deny tcp any\n INFRASTRUCTURE_ADDRESSES WILDCARD eq 1963\n access-list 150 deny tcp any\n INFRASTRUCTURE_ADDRESSES WILDCARD range 1976 1979\n\n !---\n !--- Feature: NCIA\n !---\n\n !---\n !--- Leverage the underlying protocols, DLSw, RSRB, etc. \n !---\n\n !---\n !--- Feature: DLSW\n !---\n\n access-list 150 permit tcp TRUSTED_HOSTS WILDCARD\n INFRASTRUCTURE_ADDRESSES WILDCARD eq 2065\n access-list 150 permit tcp TRUSTED_HOSTS WILDCARD\n INFRASTRUCTURE_ADDRESSES WILDCARD eq 2067\n access-list 150 permit tcp TRUSTED_HOSTS WILDCARD\n INFRASTRUCTURE_ADDRESSES WILDCARD range 1981 1983\n\n !---\n !--- Deny DLSW TCP traffic from all other sources destined\n !--- to infrastructure addresses. \n !---\n\n access-list 150 deny tcp any\n INFRASTRUCTURE_ADDRESSES WILDCARD eq 2065\n access-list 150 deny tcp any\n INFRASTRUCTURE_ADDRESSES WILDCARD eq 2067\n access-list 150 deny tcp any\n INFRASTRUCTURE_ADDRESSES WILDCARD range 1981 1983\n\n !---\n !--- Feature: RSRB\n !---\n\n access-list 150 permit tcp TRUSTED_HOSTS WILDCARD\n INFRASTRUCTURE_ADDRESSES WILDCARD range 1987 1989\n access-list 150 permit tcp TRUSTED_HOSTS WILDCARD\n INFRASTRUCTURE_ADDRESSES WILDCARD eq 1996\n\n !---\n !--- Deny RSRB TCP traffic from all other sources destined\n !--- to infrastructure addresses. \n !---\n\n access-list 150 deny tcp any\n INFRASTRUCTURE_ADDRESSES WILDCARD range 1987 1989\n access-list 150 deny tcp any\n INFRASTRUCTURE_ADDRESSES WILDCARD eq 1996\n\n !---\n !--- Feature: PPTP\n !---\n\n access-list 150 permit tcp TRUSTED_HOSTS WILDCARD\n INFRASTRUCTURE_ADDRESSES WILDCARD eq 1723\n\n !---\n !--- Deny PPTP TCP traffic from all other sources destined\n !--- to infrastructure addresses. \n !---\n\n access-list 150 deny tcp any\n INFRASTRUCTURE_ADDRESSES WILDCARD eq 1723\n\n !---\n !--- Feature: RBP\n !---\n !--- RBP will listen for TCP connections on the configured port\n !--- as per \"local port \u003cport_number\u003e\". The following example\n !--- uses port 1055\n !---\n\n access-list 150 permit tcp TRUSTED_HOSTS WILDCARD\n INFRASTRUCTURE_ADDRESSES WILDCARD eq 1055\n\n !---\n !--- Deny RBP traffic from all other sources destined\n !--- to infrastructure addresses. \n !---\n\n access-list 150 deny tcp any\n INFRASTRUCTURE_ADDRESSES WILDCARD eq 1055\n\n !---\n !--- Feature: XOT and X.25 Routing\n !---\n\n access-list 150 permit tcp TRUSTED_HOSTS WILDCARD\n INFRASTRUCTURE_ADDRESSES WILDCARD eq 1998\n\n !---\n !--- Deny XOT and X25 TCP traffic from all other sources \n !--- destined to infrastructure addresses. \n !---\n\n access-list 150 deny tcp any\n INFRASTRUCTURE_ADDRESSES WILDCARD eq 1998\n\n !---\n !--- Permit/deny all other Layer 3 and Layer 4 traffic in \n !--- accordance with existing security policies and \n !--- configurations Permit all other traffic to transit the\n !--- device. \n !---\n\n access-list 150 permit ip any any\n\n !---\n !--- Apply access-list to all interfaces (only one example\n !--- shown)\n !---\n\n interface serial 2/0\n ip access-group 150 in\n\nThe white paper entitled \"Protecting Your Core: Infrastructure\nProtection Access Control Lists\" presents guidelines and recommended\ndeployment techniques for infrastructure protection access lists. \nThis white paper can be obtained at the following link: \nhttp://www.cisco.com/en/US/tech/tk648/tk361/technologies_white_paper09186a00801a1a55.shtml\n\nReceive ACLs (rACL)\n+------------------\n\nFor distributed platforms, Receive ACLs may be an option starting in\nCisco IOS Software Versions 12.0(21)S2 for the 12000 (GSR), 12.0(24)S\nfor the 7500, and 12.0(31)S for the 10720. The Receive ACL protects\nthe device from harmful traffic before the traffic can impact the\nroute processor. Receive ACLs are designed to only protect the device\non which it is configured. On the 12000, 7500, and 10720, transit\ntraffic is never affected by a receive ACL. Because of this, the\ndestination IP address \"any\" used in the example ACL entries below\nonly refer to the router\u0027s own physical or virtual IP addresses. \nReceive ACLs are considered a network security best practice, and\nshould be considered as a long-term addition to good network\nsecurity, as well as a workaround for this specific vulnerability. \nThe white paper entitled \"Protecting Your Core: Infrastructure\nProtection Access Control Lists\" presents guidelines and recommended\ndeployment techniques for infrastructure protection access lists. \nThis white paper can be obtained at the following link \nhttp://www.cisco.com/en/US/tech/tk648/tk361/technologies_white_paper09186a00801a0a5e.shtml\n\nThe following is the receive path ACL written to permit this type of\ntraffic from trusted hosts:\n\n\n !---\n !--- Only sections pertaining to features enabled on the device\n !--- need be configured. \n !---\n\n !---\n !--- Permit ALPS traffic from trusted hosts allowed to the RP. \n !--- \n\n access-list 150 permit tcp TRUSTED_SOURCE_ADDRESSES WILDCARD\n any eq 350\n access-list 150 permit tcp TRUSTED_SOURCE_ADDRESSES WILDCARD\n any eq 10000\n\n !---\n !--- Deny ALPS traffic from all other sources to the RP. \n !--- \n\n access-list 150 deny tcp any any eq 350\n access-list 150 deny tcp any any eq 10000\n\n !---\n !--- Permit STUN traffic from trusted hosts allowed to the RP. \n !--- \n\n access-list 150 permit tcp TRUSTED_SOURCE_ADDRESSES WILDCARD\n any eq 1994\n access-list 150 permit tcp TRUSTED_SOURCE_ADDRESSES WILDCARD\n any range 1990 1992\n\n !---\n !--- Deny STUN traffic from all other sources to the RP. \n !--- \n\n access-list 150 deny tcp any any eq 1994\n access-list 150 deny tcp any any eq range 1990 1992\n\n !---\n !--- Permit BSTUN traffic from trusted hosts allowed to the RP. \n !--- \n\n access-list 150 permit tcp TRUSTED_SOURCE_ADDRESSES WILDCARD\n any eq 1963\n access-list 150 permit tcp TRUSTED_SOURCE_ADDRESSES WILDCARD\n any range 1976 1979\n\n !---\n !--- Deny BSTUN traffic from all other sources to the RP. \n !--- \n\n access-list 150 deny tcp any any eq 1963\n access-list 150 deny tcp any any eq range 1976 1979\n\n !---\n !--- Permit DLSw from trusted hosts allowed to the RP. \n !--- \n\n access-list 150 permit tcp TRUSTED_SOURCE_ADDRESSES WILDCARD\n any eq 2065\n access-list 150 permit tcp TRUSTED_SOURCE_ADDRESSES WILDCARD\n any eq 2067\n access-list 150 permit tcp TRUSTED_SOURCE_ADDRESSES WILDCARD\n any range 1981 1983\n\n !---\n !--- Deny DLSw all other sources to the RP. \n !--- \n\n access-list 150 deny tcp any any eq 2065\n access-list 150 deny tcp any any eq 2067\n access-list 150 deny tcp any any range 1981 1983\n\n !---\n !--- Permit RSRB traffic from trusted hosts allowed to the RP. \n !---\n\n access-list 150 permit tcp TRUSTED_SOURCE_ADDRESSES WILDCARD\n any eq 1996\n access-list 150 permit tcp TRUSTED_SOURCE_ADDRESSES WILDCARD\n any range 1987 1989\n\n !---\n !--- Deny RSRB traffic from all other sources to the RP. \n !---\n\n access-list 150 deny tcp any any eq 1996\n access-list 150 deny tcp any any range 1987 1989\n\n !--- \n !--- Permit PPTP traffic from trusted hosts allowed to the RP. \n !--- \n\n access-list 150 permit tcp TRUSTED_SOURCE_ADDRESSES WILDCARD\n any eq 1723\n\n !---\n !--- Deny PPTP traffic from all other sources to the RP. \n !--- \n\n access-list 150 deny tcp any any eq 1723\n\n !---\n !--- Permit RBP traffic from trusted hosts allowed to the RP. \n !--- RBP will listen for TCP connections on the configured port\n !--- as per \"local port \u003cport_number\u003e\". The following example\n !--- uses port 1055\n !---\n\n access-list 150 permit tcp TRUSTED_SOURCE_ADDRESSES WILDCARD\n any eq 1055\n\n !---\n !--- Deny RBP traffic from all other sources to the RP. \n !---\n\n access-list 150 deny tcp any any eq 1055\n\n !---\n !--- Permit XOT and X.25 Routing traffic from trusted hosts allowed \n !--- to the RP. \n !---\n\n access-list 150 permit tcp TRUSTED_SOURCE_ADDRESSES WILDCARD\n any eq 1998\n\n !---\n !--- Deny XOT and X.25 Routing traffic from all other sources to \n !--- the RP. \n !---\n\n access-list 150 deny tcp any any eq 1998\n\n !--- Permit all other traffic to the RP. \n !--- according to security policy and configurations. \n\n access-list 150 permit ip any any\n\n !--- Apply this access list to the \u0027receive\u0027 path. \n\n ip receive access-list 150\n\nControl Plane Policing\n+---------------------\n\nControl Plane Policing (CoPP) can be used to block the affected\nfeatures TCP traffic access to the device. Cisco IOS software\nreleases 12.0S, 12.2SX, 12.2S, 12.3T, 12.4, and 12.4T support the\nCoPP feature. CoPP can be configured on a device to protect the\nmanagement and control planes and minimize the risk and effectiveness\nof direct infrastructure attacks by explicitly permitting only\nauthorized traffic that is sent to infrastructure devices in\naccordance with existing security policies and configurations. The\nCoPP example below should be included as part of the deployed CoPP\nthat will protect all devices with IP addresses in the infrastructure\nIP address range. \n\n\n !---\n !--- Only sections pertaining to features enabled on the device\n !--- need be configured. \n !---\n !--- Feature: ALPS\n !---\n\n access-list 150 deny tcp TRUSTED_HOSTS WILDCARD any eq 350\n access-list 150 deny tcp TRUSTED_HOSTS WILDCARD any eq 10000\n\n !---\n !--- Permit ALPS traffic sent to all IP addresses\n !--- configured on all interfaces of the affected device so\n !--- that it will be policed and dropped by the CoPP feature\n !---\n\n access-list 150 permit tcp any any eq 350\n access-list 150 permit tcp any any eq 10000\n\n !---\n !--- Feature: STUN\n !---\n\n access-list 150 deny tcp TRUSTED_HOSTS WILDCARD\n any eq 1994\n access-list 150 deny tcp TRUSTED_HOSTS WILDCARD\n any range 1990 1992\n\n !---\n !--- Permit STUN traffic sent to all IP addresses\n !--- configured on all interfaces of the affected device so \n !--- that it will be policed and dropped by the CoPP feature\n !---\n\n access-list 150 permit tcp any any eq 1994\n access-list 150 permit tcp any any range 1990 1992\n\n !---\n !--- Feature: BSTUN\n !---\n\n access-list 150 deny tcp TRUSTED_HOSTS WILDCARD\n any eq 1963\n access-list 150 deny tcp TRUSTED_HOSTS WILDCARD\n any range 1976 1979\n\n !---\n !--- Permit BSTUN traffic sent to all IP addresses\n !--- configured on all interfaces of the affected device so\n !--- that it will be policed and dropped by the CoPP feature\n !---\n\n access-list 150 permit tcp any any eq 1963\n access-list 150 permit tcp any any range 1976 1979\n\n !---\n !--- Feature: NCIA\n !---\n !--- Leverage the underlying protocols, DLSw, RSRB, etc. \n !---\n\n !---\n !--- Feature: DLSW\n !---\n\n access-list 150 deny tcp TRUSTED_HOSTS WILDCARD\n any eq 2065\n access-list 150 deny tcp TRUSTED_HOSTS WILDCARD\n any eq 2067\n access-list 150 deny tcp TRUSTED_HOSTS WILDCARD\n any range 1981 1983\n\n !---\n !--- Permit DLSW traffic sent to all IP addresses\n !--- configured on all interfaces of the affected device so \n !--- that it will be policed and dropped by the CoPP feature\n !---\n\n access-list 150 permit tcp any any eq 2065\n access-list 150 permit tcp any any eq 2067\n access-list 150 permit tcp any any range 1981 1983\n\n !---\n !--- Feature: RSRB\n !---\n\n access-list 150 deny tcp TRUSTED_HOSTS WILDCARD\n any range 1987 1989\n access-list 150 deny tcp TRUSTED_HOSTS WILDCARD\n any eq 1996\n\n !---\n !--- Permit RSRB traffic sent to all IP addresses\n !--- configured on all interfaces of the affected device so \n !--- that it will be policed and dropped by the CoPP feature\n !---\n\n access-list 150 permit tcp any any range 1987 1989\n access-list 150 permit tcp any any eq 1996\n\n !---\n !--- Feature: PPTP\n !---\n\n access-list 150 deny tcp TRUSTED_HOSTS WILDCARD\n any eq 1723\n\n !---\n !--- Permit PPTP traffic sent to all IP addresses\n !--- configured on all interfaces of the affected device so \n !--- that it will be policed and dropped by the CoPP feature\n !---\n\n access-list 150 permit tcp any any eq 1723\n\n !---\n !--- Feature: RBP\n !---\n !--- RBP will listen for TCP connections on the configured port\n !--- as per \"local port \u003cport_number\u003e\". The following example\n !--- uses port 1055\n\n access-list 150 deny tcp TRUSTED_HOSTS WILDCARD\n any eq 1055\n\n !---\n !--- Permit RBP traffic sent to all IP addresses\n !--- configured on all interfaces of the affected device so \n !--- that it will be policed and dropped by the CoPP feature\n !---\n\n access-list 150 permit tcp any any eq 1055\n\n !---\n !--- Feature: XOT and X.25 Routing\n !---\n\n access-list 150 deny tcp TRUSTED_HOSTS WILDCARD\n any eq 1998\n\n !---\n !--- Permit XOT and X25 traffic sent to all IP addresses\n !--- configured on all interfaces of the affected device so \n !--- that it will be policed and dropped by the CoPP feature\n !---\n\n access-list 150 permit tcp any any eq 1998\n\n !---\n !--- Permit (Police or Drop)/Deny (Allow) all other Layer3 and \n !--- Layer4 traffic in accordance with existing security policies\n !--- configurations for traffic that is authorized to be sent\n !--- and to infrastructure devices\n !--- Create a Class-Map for traffic to be policed by\n !--- the CoPP feature\n !---\n\n class-map match-all drop-tcp-class\n match access-group 150\n\n !---\n !--- Create a Policy-Map that will be applied to the\n !--- Control-Plane of the device. \n !---\n\n policy-map drop-tcp-traffic\n class drop-tcp-class\n drop\n\n !---\n !--- Apply the Policy-Map to the \n !--- Control-Plane of the device\n !---\n\n control-plane\n service-policy input drop-tcp-traffic\n\nIn the above CoPP example, the access control list entries (ACEs)\nthat match the potential exploit packets with the \"permit\" action\nresult in these packets being discarded by the policy-map \"drop\"\nfunction, while packets that match the \"deny\" action (not shown) are\nnot affected by the policy-map drop function. Please note that the\npolicy-map syntax is different in the 12.2S and 12.0S Cisco IOS\ntrains:\n\n policy-map drop-tcp-traffic\n class drop-tcp-class\n police 32000 1500 1500 conform-action drop exceed-action drop\n\nAdditional information on the configuration and use of the CoPP\nfeature can be found in the documents, \"Control Plane Policing\nImplementation Best Practices\" and \"Cisco IOS Software Releases 12.2S\n- - Control Plane Policing\" at the following links \nhttp://www.cisco.com/web/about/security/intelligence/coppwp_gs.html\nand\nhttp://www.cisco.com/en/US/docs/ios/12_3t/12_3t4/feature/guide/gtrtlimt.html\n\nAdditional mitigations that can be deployed on Cisco devices within\nthe network are available in the \"Cisco Applied Mitigation Bulletin\"\ncompanion document for this advisory, at the following link \nhttp://www.cisco.com/warp/public/707/cisco-amb-20090325-tcp-and-ip.shtml\n\nObtaining Fixed Software\n========================\n\nCisco has released free software updates that address these\nvulnerabilities. Prior to deploying software, customers should\nconsult their maintenance provider or check the software for feature\nset compatibility and known issues specific to their environment. \n\nCustomers may only install and expect support for the feature sets\nthey have purchased. By installing, downloading, accessing or\notherwise using such software upgrades, customers agree to be bound\nby the terms of Cisco\u0027s software license terms found at \nhttp://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html,\nor as otherwise set forth at Cisco.com Downloads at \nhttp://www.cisco.com/public/sw-center/sw-usingswc.shtml \n\nDo not contact psirt@cisco.com or security-alert@cisco.com for\nsoftware upgrades. \n\nCustomers with Service Contracts\n+-------------------------------\n\nCustomers with contracts should obtain upgraded software through\ntheir regular update channels. For most customers, this means that\nupgrades should be obtained through the Software Center on Cisco\u0027s\nworldwide website at http://www.cisco.com\n\nCustomers using Third Party Support Organizations\n+------------------------------------------------\n\nCustomers whose Cisco products are provided or maintained through\nprior or existing agreements with third-party support organizations,\nsuch as Cisco Partners, authorized resellers, or service providers\nshould contact that support organization for guidance and assistance\nwith the appropriate course of action in regards to this advisory. \n\nThe effectiveness of any workaround or fix is dependent on specific\ncustomer situations, such as product mix, network topology, traffic\nbehavior, and organizational mission. Due to the variety of affected\nproducts and releases, customers should consult with their service\nprovider or support organization to ensure any applied workaround or\nfix is the most appropriate for use in the intended network before it\nis deployed. \n\nCustomers without Service Contracts\n+----------------------------------\n\nCustomers who purchase direct from Cisco but do not hold a Cisco\nservice contract, and customers who purchase through third-party\nvendors but are unsuccessful in obtaining fixed software through\ntheir point of sale should acquire upgrades by contacting the Cisco\nTechnical Assistance Center (TAC). TAC contacts are as follows. \n\n * +1 800 553 2447 (toll free from within North America)\n * +1 408 526 7209 (toll call from anywhere in the world)\n * e-mail: tac@cisco.com\n\nCustomers should have their product serial number available and be\nprepared to give the URL of this notice as evidence of entitlement to\na free upgrade. Free upgrades for non-contract customers must be\nrequested through the TAC. \n\nRefer to http://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html\nfor additional TAC contact information, including localized telephone\nnumbers, and instructions and e-mail addresses for use in various \nlanguages. \n\nExploitation and Public Announcements\n=====================================\n\nThe Cisco PSIRT is not aware of any public announcements or malicious\nuse of the vulnerability described in this advisory. \n\nThis vulnerability was found by Cisco internal testing. \n\nStatus of this Notice: FINAL\n============================\n\nTHIS DOCUMENT IS PROVIDED ON AN \"AS IS\" BASIS AND DOES NOT IMPLY ANY\nKIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF\nMERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE\nINFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS\nAT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS\nDOCUMENT AT ANY TIME. \n\nA stand-alone copy or Paraphrase of the text of this document that\nomits the distribution URL in the following section is an\nuncontrolled copy, and may lack important information or contain\nfactual errors. \n\nDistribution\n============\n\nThis advisory is posted on Cisco\u0027s worldwide website at :\n\nhttp://www.cisco.com/warp/public/707/cisco-sa-20090325-tcp.shtml\n\nIn addition to worldwide web posting, a text version of this notice\nis clear-signed with the Cisco PSIRT PGP key and is posted to the\nfollowing e-mail and Usenet news recipients. \n\n * cust-security-announce@cisco.com\n * first-bulletins@lists.first.org\n * bugtraq@securityfocus.com\n * vulnwatch@vulnwatch.org\n * cisco@spot.colorado.edu\n * cisco-nsp@puck.nether.net\n * full-disclosure@lists.grok.org.uk\n * comp.dcom.sys.cisco@newsgate.cisco.com\n\nFuture updates of this advisory, if any, will be placed on Cisco\u0027s\nworldwide website, but may or may not be actively announced on\nmailing lists or newsgroups. Users concerned about this problem are\nencouraged to check the above URL for any updates. \n\nRevision History\n================\n\n+---------------------------------------+\n| Revision | | Initial |\n| 1.0 | 2009-March-25 | public |\n| | | release |\n+---------------------------------------+\n\nCisco Security Procedures\n=========================\n\nComplete information on reporting security vulnerabilities in Cisco\nproducts, obtaining assistance with security incidents, and\nregistering to receive security information from Cisco, is available\non Cisco\u0027s worldwide website at \nhttp://www.cisco.com/en/US/products/products_security_vulnerability_policy.html\nThis includes instructions for press inquiries regarding Cisco \nsecurity notices. All Cisco security advisories are available at \nhttp://www.cisco.com/go/psirt\n-----BEGIN PGP SIGNATURE-----\nVersion: GnuPG v1.4.8 (Darwin)\n\niEYEARECAAYFAknKUb8ACgkQ86n/Gc8U/uCp1gCfS6aMv74rf1bDoby1JcGRFsN3\nhpYAn1Oqp7nQxPwBrtptF3WM42HgGdIk\n=NVYK\n-----END PGP SIGNATURE-----\n\n_______________________________________________\nFull-Disclosure - We believe in it. \nCharter: http://lists.grok.org.uk/full-disclosure-charter.html\nHosted and sponsored by Secunia - http://secunia.com/\n. ----------------------------------------------------------------------\n\nSecunia is pleased to announce the release of the annual Secunia\nreport for 2008. \n\n2) An unspecified error exists in the handling of IP sockets, which\ncan be exploited to prevent accepting new connections or sessions,\nexhaust memory, cause high CPU load, or to cause a reload of an\naffected device. \n\n4) An unspecified error in the Cisco IOS SCP server (disabled by\ndefault) can be exploited to retrieve or write to arbitrary files on\nthe device\u0027s file system, regardless of the CLI view configuration. \n\nSuccessful exploitation of this vulnerability requires valid user\naccess with an attached command-line interface (CLI) view. \n\n5) An unspecified error in the implementation of the Session\nInitiation Protocol (SIP) can be exploited to reload an affected\ndevice via a specially crafted SIP message. \n\nThis vulnerability is reported in Cisco IOS with SIP voice services\nenabled, and which process SIP messages as part of configured VoIP\nfunctionality. \n\nSOLUTION:\nPlease see the following vendor advisory for fixed versions. \nhttp://www.cisco.com/warp/public/707/cisco-sa-20090325-bundle.shtml\n\nPROVIDED AND/OR DISCOVERED BY:\n1, 3, 5 - 9) Reported by the vendor. \n2) The vendor also credits Jens Link. \n4) The vendor credits Kevin Graham. \n\nORIGINAL ADVISORY:\nCisco:\nhttp://www.cisco.com/warp/public/707/cisco-sa-20090325-ctcp.shtml\nhttp://www.cisco.com/warp/public/707/cisco-sa-20090325-ip.shtml\nhttp://www.cisco.com/warp/public/707/cisco-sa-20090325-mobileip.shtml\nhttp://www.cisco.com/warp/public/707/cisco-sa-20090325-scp.shtml\nhttp://www.cisco.com/warp/public/707/cisco-sa-20090325-sip.shtml\nhttp://www.cisco.com/warp/public/707/cisco-sa-20090325-tcp.shtml\nhttp://www.cisco.com/warp/public/707/cisco-sa-20090325-udp.shtml\nhttp://www.cisco.com/warp/public/707/cisco-sa-20090325-webvpn.shtml\n\nOTHER REFERENCES:\nhttp://www.cisco.com/warp/public/707/cisco-amb-20090325-sip-and-udp.shtml\nhttp://www.cisco.com/warp/public/707/cisco-amb-20090325-ctcp.shtml\n\n----------------------------------------------------------------------\n\nAbout:\nThis Advisory was delivered by Secunia as a free service to help\neverybody keeping their systems up to date against the latest\nvulnerabilities. \n\nSubscribe:\nhttp://secunia.com/advisories/secunia_security_advisories/\n\nDefinitions: (Criticality, Where etc.)\nhttp://secunia.com/advisories/about_secunia_advisories/\n\n\nPlease Note:\nSecunia recommends that you verify all advisories you receive by\nclicking the link. \nSecunia NEVER sends attached files with advisories. \nSecunia does not advise people to install third party patches, only\nuse those supplied by the vendor. \n\n----------------------------------------------------------------------\n\nUnsubscribe: Secunia Security Advisories\nhttp://secunia.com/sec_adv_unsubscribe/?email=packet%40packetstormsecurity.org\n\n----------------------------------------------------------------------\n\n\n", "sources": [ { "db": "NVD", "id": "CVE-2009-0629" }, { "db": "JVNDB", "id": "JVNDB-2009-001560" }, { "db": "BID", "id": "34238" }, { "db": "VULHUB", "id": "VHN-38075" }, { "db": "PACKETSTORM", "id": "76064" }, { "db": "PACKETSTORM", "id": "76097" } ], "trust": 2.16 }, 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"http://xforce.iss.net/xforce/xfdb/49420" }, { "trust": 0.8, "url": "http://web.nvd.nist.gov/view/vuln/detail?vulnid=cve-2009-0629" }, { "trust": 0.3, "url": "http://www.cisco.com/" }, { "trust": 0.3, "url": "/archive/1/502162" }, { "trust": 0.3, "url": "http://www.cisco.com/warp/public/707/cisco-amb-20080130-wcs.shtml" }, { "trust": 0.3, "url": "http://www.cisco.com/en/us/products/products_security_advisory09186a0080a904cb.shtml#@id" }, { "trust": 0.2, "url": "http://www.cisco.com/warp/public/707/cisco-sa-20090325-ip.shtml" }, { "trust": 0.2, "url": "http://www.cisco.com/warp/public/707/cisco-sa-20090325-tcp.shtml" }, { "trust": 0.2, "url": "http://www.cisco.com/warp/public/707/cisco-sa-20090325-sip.shtml" }, { "trust": 0.2, "url": "http://www.cisco.com/warp/public/707/cisco-sa-20090325-bundle.shtml" }, { "trust": 0.2, "url": "http://www.cisco.com/warp/public/707/cisco-sa-20090325-webvpn.shtml" }, { "trust": 0.2, "url": "http://www.cisco.com/warp/public/707/cisco-sa-20090325-scp.shtml" }, { "trust": 0.2, "url": "http://www.cisco.com/warp/public/707/cisco-sa-20090325-ctcp.shtml" }, { "trust": 0.2, "url": "http://www.cisco.com/warp/public/707/cisco-sa-20090325-udp.shtml" }, { "trust": 0.2, "url": "http://www.cisco.com/warp/public/707/cisco-sa-20090325-mobileip.shtml" }, { "trust": 0.1, "url": "http://www.cisco.com/en/us/docs/ios/12_2/ibm/configuration/guide/bcfrsrb_ps1835_tsd_products_configuration_guide_chapter.html" }, { "trust": 0.1, "url": "http://www.cisco.com/warp/public/620/1.html" }, { "trust": 0.1, "url": "http://www.cisco.com/go/psirt" }, { "trust": 0.1, "url": "http://www.cisco.com/en/us/docs/ios/vpdn/configuration/guide/client_init_dial-in_ps6350_tsd_products_configuration_guide_chapter.html#wp1105140" }, { "trust": 0.1, "url": "http://www.cisco.com/en/us/docs/ios/12_3t/12_3t4/feature/guide/gtrtlimt.html" }, { "trust": 0.1, "url": 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Sightings
Author | Source | Type | Date |
---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.