var-201110-0247
Vulnerability from variot
The IP Service Level Agreement (IP SLA) functionality in Cisco IOS 15.1, and IOS XE 2.1.x through 3.3.x, allows remote attackers to cause a denial of service (memory corruption and device reload) via malformed IP SLA packets, aka Bug ID CSCtk67073. Cisco IOS is prone to a remote denial-of-service vulnerability. An attacker can exploit this issue to cause the affected devices to reload, denying service to legitimate users. Repeat attacks will result in denial-of-service condition. This issue is tracked by Cisco Bug ID CSCtk67073. Cisco's Internet Operating System (IOS) is a complex operating system optimized for Internet interconnection. The data flow interaction function DLSw can realize the transmission of IBM SNA and network BIOS traffic on the IP network. ----------------------------------------------------------------------
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Please see the vendor's advisory for a list of affected versions.
SOLUTION: Update to a fixed version (please see the vendor's advisory for details).
PROVIDED AND/OR DISCOVERED BY: Reported by the vendor.
ORIGINAL ADVISORY: http://www.cisco.com/warp/public/707/cisco-sa-20110928-ipsla.shtml
OTHER REFERENCES: Further details available in Customer Area: http://secunia.com/vulnerability_intelligence/
DEEP LINKS: Further details available in Customer Area: http://secunia.com/vulnerability_intelligence/
EXTENDED DESCRIPTION: Further details available in Customer Area: http://secunia.com/vulnerability_intelligence/
EXTENDED SOLUTION: Further details available in Customer Area: http://secunia.com/vulnerability_intelligence/
EXPLOIT: Further details available in Customer Area: http://secunia.com/vulnerability_intelligence/
About: This Advisory was delivered by Secunia as a free service to help private users keeping their systems up to date against the latest vulnerabilities.
Subscribe: http://secunia.com/advisories/secunia_security_advisories/
Definitions: (Criticality, Where etc.) http://secunia.com/advisories/about_secunia_advisories/
Please Note: Secunia recommends that you verify all advisories you receive by clicking the link. Secunia NEVER sends attached files with advisories. Secunia does not advise people to install third party patches, only use those supplied by the vendor. The vulnerability is triggered when malformed UDP packets are sent to a vulnerable device. The vulnerable UDP port numbers depend on the device configuration. Default ports are not used for the vulnerable UDP IP SLA operation or for the UDP responder ports.
Cisco has released free software updates that address this vulnerability.
This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20110928-ipsla.shtml.
Note: The September 28, 2011, Cisco IOS Software Security Advisory bundled publication includes ten Cisco Security Advisories. Each advisory lists the Cisco IOS Software releases that correct the vulnerability or vulnerabilities detailed in the advisory as well as the Cisco IOS Software releases that correct all vulnerabilities in the September 2011 Bundled Publication.
Individual publication links are in "Cisco Event Response: Semiannual Cisco IOS Software Security Advisory Bundled Publication" at the following link:
http://www.cisco.com/web/about/security/intelligence/Cisco_ERP_sep11.html
Affected Products
Vulnerable Products +------------------
Cisco devices that are running Cisco IOS Software are vulnerable when they are configured for IP SLA, either as responders or as originators of vulnerable IP SLA operations.
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 shows output from a device that runs a Cisco IOS Software image:
Router> show version
Cisco IOS Software, C3900 Software (C3900-UNIVERSALK9-M), Version 15.0(1)M1, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2009 by Cisco Systems, Inc.
Compiled Wed 02-Dec-09 17:17 by prod_rel_team
!--- output truncated
Additional information about Cisco IOS Software release naming conventions is available in the white paper Cisco IOS and NX-OS Software Reference Guide available at:
http://www.cisco.com/web/about/security/intelligence/ios-ref.html
Products Confirmed Not Vulnerable +--------------------------------
No other Cisco products are currently known to be affected by this vulnerability.
Details
IP SLA is an embedded agent in Cisco IOS Software designed to measure and monitor common network performance metrics like jitter, latency (delay), and packet loss.
The vulnerability that is described in this document is triggered by malformed UDP packets triggered by malformed IP SLA packets sent to the vulnerable device and port. A vulnerable device can be an IP SLA responder or the source device of a vulnerable IP SLA operation.
Vulnerable IP SLA Responder Configurations +-----------------------------------------
A device configured either as an IP SLA general responder or a permanent IP SLA UDP responder is vulnerable.
The general responder processes IP SLA control protocol packets on UDP port 1967 and then may dynamically open vulnerable UDP ports according to the IP SLA operations requested using the control protocol. The configuration for a general responder is as follows:
ip sla responder
The IP SLA UDP permanent responder is also vulnerable. An example configuration is as follows:
ip sla responder udp-echo port 300
There is no default UDP port number for the UDP permanent responder
Alternatively, both the general responder and the permanent responder can be identified with the "show ip sla responder" command. The general responder is vulnerable when it has been enabled. The permanent responder is vulnerable only when it has been enabled and the "udpEcho Responder" is present. In the Following example, the general responder is not vulnerable because it has not been enabled but the permanent responder is vulnerable because it has been enabled with a UDP echo responder:
Router# show ip sla responder
General IP SLA Responder on Control port 1967
General IP SLA Responder is: Disabled
Permanent Port IP SLA Responder
Permanent Port IP SLA Responder is: Enabled
udpEcho Responder:
IP Address Port
0.0.0.0 300
Vulnerable IP SLA Source Device Configurations +---------------------------------------------
An IP SLA source device is a Cisco IOS device that has at least one IP SLA operation configured. To be vulnerable a probe originator needs to have at least one scheduled probe that uses either of the following IP SLA operations:
- udp-jitter probe
- udp-echo
A vulnerable IP SLA source device configuration includes all the following commands:
-
An "ip sla" global configuration command to define an IP SLA operation
-
Either a "udp-echo" or a "udp-jitter" IP SLA configuration command
-
An "ip sla schedule" global configuration command that activates one of the probes that uses a vulnerable IP SLA operation
The following examples show a source device that is configured for IP SLA UDP echo and UDP jitter probes:
ip sla 201
udp-echo 192.168.134.21 201
ip sla schedule 201 start-time now
ip sla 301
udp-jitter 192.168.134.121 122
ip sla schedule 301 start-time now
The destination UDP ports for the probes need to be configured. If the source UDP port is not configured an available port number will be used when the probe is started. A device that originates a vulnerable operation will be vulnerable on the source UDP ports of the probe and a responder will be vulnerable on the destination UDP port used for the probe.
IP SLA probes can be configured using Simple Network Management Protocol (SNMP). In that case, by default, the "show running configuration" command will not include the IP SLA probe configuration. The "show ip sla configuration" command can be used to verify whether a probe has been configured either by the command line or via SNMP.
Router# show ip sla configuration | include operation
Type of operation to perform: udp-jitter
Type of operation to perform: udp-echo
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
- CSCtk67073 ("IP SLA Memory Corruption 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 the vulnerability described in this document may result in the reload of a vulnerable device.
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.
Additionally, the Cisco IOS Software Checker is available on the Cisco Security Intelligence Operations (SIO) portal at http://tools.cisco.com/security/center/selectIOSVersion.x. It provides several features for checking which Security Advisories affect specified versions of Cisco IOS Software.
Cisco IOS Software +-----------------
Each row of the following Cisco IOS Software table corresponds to a Cisco IOS Software train. If a particular train is vulnerable, the earliest releases that contain the fix are listed in the First Fixed Release For This Advisory column. The First Fixed Release for All Advisories in the September 2011 Bundled Publication column lists the earliest possible releases that correct all the published vulnerabilities in the Cisco IOS Software Security Advisory bundled publication. Cisco recommends upgrading to the latest available release, where possible.
+------------------------------------------------------------+ | Major | Availability of Repaired Releases | | Release | | |------------+-----------------------------------------------| | Affected | | First Fixed Release for | | 12.0-Based | First Fixed | All Advisories in the | | Releases | Release | September 2011 Bundled | | | | Publication | |------------------------------------------------------------| | There are no affected 12.0-based releases | |------------------------------------------------------------| | Affected | | First Fixed Release for | | 12.1-Based | First Fixed | All Advisories in the | | Releases | Release | September 2011 Bundled | | | | Publication | |------------------------------------------------------------| | There are no affected 12.1-based releases | |------------------------------------------------------------| | Affected | | First Fixed Release for | | 12.2-Based | First Fixed | All Advisories in the | | Releases | Release | September 2011 Bundled | | | | Publication | |------------------------------------------------------------| | There are no affected 12.2-based releases | |------------------------------------------------------------| | Affected | | First Fixed Release for | | 12.3-Based | First Fixed | All Advisories in the | | Releases | Release | September 2011 Bundled | | | | Publication | |------------------------------------------------------------| | There are no affected 12.3-based releases | |------------------------------------------------------------| | Affected | | First Fixed Release for | | 12.4-Based | First Fixed | All Advisories in the | | Releases | Release | September 2011 Bundled | | | | Publication | |------------------------------------------------------------| | There are no affected 12.4-based releases | |------------------------------------------------------------| | Affected | | First Fixed Release for | | 15.0-Based | First Fixed | All Advisories in the | | Releases | Release | September 2011 Bundled | | | | Publication | |------------------------------------------------------------| | There are no affected 15.0-based releases | |------------------------------------------------------------| | Affected | | First Fixed Release for | | 15.1-Based | First Fixed | All Advisories in the | | Releases | Release | September 2011 Bundled | | | | Publication | |------------+------------------+----------------------------| | | | Vulnerable; contact your | | | | support organization per | | 15.1EY | Not vulnerable | the instructions in the | | | | Obtaining Fixed Software | | | | section of this advisory. | |------------+------------------+----------------------------| | | Vulnerable; | Vulnerable; first fixed in | | 15.1GC | first fixed in | Release 15.1T | | | Release 15.1T | | |------------+------------------+----------------------------| | 15.1M | Not vulnerable | 15.1(4)M2; Available on | | | | 30-SEP-11 | |------------+------------------+----------------------------| | | | Vulnerable; contact your | | | | support organization per | | 15.1MR | Not vulnerable | the instructions in the | | | | Obtaining Fixed Software | | | | section of this advisory. | |------------+------------------+----------------------------| | | 15.1(2)S | 15.1(2)S2 | | | | | | | Cisco IOS XE | 15.1(3)S | | 15.1S | devices: Please | | | | see Cisco IOS-XE | Cisco IOS XE devices: | | | Software | Please see Cisco IOS-XE | | | Availability | Software Availability | |------------+------------------+----------------------------| | | 15.1(1)T3 | 15.1(1)T4; Available on | | | | 08-DEC-11 | | 15.1T | 15.1(2)T4 | | | | | 15.1(2)T4 | | | 15.1(3)T2 | | | | | 15.1(3)T2 | |------------+------------------+----------------------------| | | Vulnerable; | Vulnerable; first fixed in | | 15.1XB | first fixed in | Release 15.1T | | | Release 15.1T | | |------------+------------------+----------------------------| | Affected | | First Fixed Release for | | 15.2-Based | First Fixed | All Advisories in the | | Releases | Release | September 2011 Bundled | | | | Publication | |------------------------------------------------------------| | There are no affected 15.2-based releases | +------------------------------------------------------------+
Cisco IOS XE Software +--------------------
Cisco IOS XE Software is affected by the vulnerability disclosed in this document.
+------------------------------------------------------------+ | Cisco | First Fixed | First Fixed Release for All | | IOS XE | Release | Advisories in the September | | Release | | 2011 Bundled Publication | |---------+-----------------+--------------------------------| | | Vulnerable; | Vulnerable; migrate to 3.3.2S | | 2.1.x | migrate to | or later | | | 3.3.2S or later | | |---------+-----------------+--------------------------------| | | Vulnerable; | Vulnerable; migrate to 3.3.2S | | 2.2.x | migrate to | or later | | | 3.3.2S or later | | |---------+-----------------+--------------------------------| | | Vulnerable; | Vulnerable; migrate to 3.3.2S | | 2.3.x | migrate to | or later | | | 3.3.2S or later | | |---------+-----------------+--------------------------------| | | Vulnerable; | Vulnerable; migrate to 3.3.2S | | 2.4.x | migrate to | or later | | | 3.3.2S or later | | |---------+-----------------+--------------------------------| | | Vulnerable; | Vulnerable; migrate to 3.3.2S | | 2.5.x | migrate to | or later | | | 3.3.2S or later | | |---------+-----------------+--------------------------------| | | Vulnerable; | Vulnerable; migrate to 3.3.2S | | 2.6.x | migrate to | or later | | | 3.3.2S or later | | |---------+-----------------+--------------------------------| | | Vulnerable; | Vulnerable; migrate to 3.3.2S | | 3.1.xS | migrate to | or later | | | 3.3.2S or later | | |---------+-----------------+--------------------------------| | | Vulnerable; | | | 3.1.xSG | migrate to | Vulnerable; migrate to 3.2.0SG | | | 3.2.0SG or | or later | | | later | | |---------+-----------------+--------------------------------| | | Vulnerable; | Vulnerable; migrate to 3.3.2S | | 3.2.xS | migrate to | or later | | | 3.3.2S or later | | |---------+-----------------+--------------------------------| | 3.2.xSG | Not vulnerable | Not vulnerable | |---------+-----------------+--------------------------------| | 3.3.xS | 3.3.0S | 3.3.2S | |---------+-----------------+--------------------------------| | 3.4.xS | Not vulnerable | Not vulnerable | +------------------------------------------------------------+
For mapping of Cisco IOS XE to Cisco IOS releases, please refer to the Cisco IOS XE 2 Release Notes, Cisco IOS XE 3S Release Notes, and Cisco IOS XE 3SG Release Notes.
Cisco IOS XR Software +--------------------
Cisco IOS XR Software is not affected by any of the vulnerabilities in the September 2011 bundled publication.
Workarounds
There are no workarounds for this vulnerability, but there are mitigations that can be deployed on a general IP SLA responder to reduce the exposure to this vulnerability.
General IP SLA Responder Mitigation +----------------------------------
For devices that are configured as general responders, a mitigation is to restrict IP SLA control packets on UDP port 1967 that are addressed to the vulnerable device to permit only trusted probe originators to open UDP ports that could be exploited. This can be accomplished using techniques such as Infrastructure Access list or Control Plane Protection.
For devices configured as general responders, mitigation techniques that can be deployed on Cisco devices within the network are available in the Cisco Applied Mitigation Bulletin companion document for this advisory:
http://www.cisco.com/warp/public/707/cisco-amb-20110928-ipsla.shtml
IP SLA Permanent Responder Mitigation +------------------------------------
For the permanent responder, the mitigation is to filter UDP packets addressed to the configured UDP port of each permanent responder to permit packets from the IP addresses of trusted devices.
IP SLA Source Devices Mitigation +-------------------------------
For IP SLA source devices, a mitigation is to allow only UDP packets from trusted devices (that is, devices that are the target of IP SLA operations).
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.
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-20110928-ipsla.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 1.0 | 2011-Sep-28 | Initial 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.
+-------------------------------------------------------------------- Copyright 2010-2011 Cisco Systems, Inc. All rights reserved. +--------------------------------------------------------------------
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"data": "The IP Service Level Agreement (IP SLA) functionality in Cisco IOS 15.1, and IOS XE 2.1.x through 3.3.x, allows remote attackers to cause a denial of service (memory corruption and device reload) via malformed IP SLA packets, aka Bug ID CSCtk67073. Cisco IOS is prone to a remote denial-of-service vulnerability. \nAn attacker can exploit this issue to cause the affected devices to reload, denying service to legitimate users. Repeat attacks will result in denial-of-service condition. \nThis issue is tracked by Cisco Bug ID CSCtk67073. Cisco\u0027s Internet Operating System (IOS) is a complex operating system optimized for Internet interconnection. The data flow interaction function DLSw can realize the transmission of IBM SNA and network BIOS traffic on the IP network. ----------------------------------------------------------------------\n\nOvum says ad hoc tools are out-dated. The best practice approach?\nFast vulnerability intelligence, threat handling, and setup in one tool. \n\nPlease see the vendor\u0027s advisory for a list of affected versions. \n\nSOLUTION:\nUpdate to a fixed version (please see the vendor\u0027s advisory for\ndetails). \n\nPROVIDED AND/OR DISCOVERED BY:\nReported by the vendor. \n\nORIGINAL ADVISORY:\nhttp://www.cisco.com/warp/public/707/cisco-sa-20110928-ipsla.shtml\n\nOTHER REFERENCES:\nFurther details available in Customer Area:\nhttp://secunia.com/vulnerability_intelligence/\n\nDEEP LINKS:\nFurther details available in Customer Area:\nhttp://secunia.com/vulnerability_intelligence/\n\nEXTENDED DESCRIPTION:\nFurther details available in Customer Area:\nhttp://secunia.com/vulnerability_intelligence/\n\nEXTENDED SOLUTION:\nFurther details available in Customer Area:\nhttp://secunia.com/vulnerability_intelligence/\n\nEXPLOIT:\nFurther details available in Customer Area:\nhttp://secunia.com/vulnerability_intelligence/\n\n----------------------------------------------------------------------\n\nAbout:\nThis Advisory was delivered by Secunia as a free service to help\nprivate users 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. The vulnerability is triggered\nwhen malformed UDP packets are sent to a vulnerable device. The\nvulnerable UDP port numbers depend on the device configuration. \nDefault ports are not used for the vulnerable UDP IP SLA operation or\nfor the UDP responder ports. \n\nCisco has released free software updates that address this\nvulnerability. \n\nThis advisory is posted at\nhttp://www.cisco.com/warp/public/707/cisco-sa-20110928-ipsla.shtml. \n\nNote: The September 28, 2011, Cisco IOS Software Security Advisory\nbundled publication includes ten Cisco Security Advisories. Each advisory lists the Cisco IOS Software releases that\ncorrect the vulnerability or vulnerabilities detailed in the advisory as\nwell as the Cisco IOS Software releases that correct all vulnerabilities\nin the September 2011 Bundled Publication. \n\nIndividual publication links are in \"Cisco Event Response: Semiannual\nCisco IOS Software Security Advisory Bundled Publication\" at the\nfollowing link:\n\nhttp://www.cisco.com/web/about/security/intelligence/Cisco_ERP_sep11.html\n\nAffected Products\n=================\n\nVulnerable Products\n+------------------\n\nCisco devices that are running Cisco IOS Software are vulnerable when\nthey are configured for IP SLA, either as responders or as\noriginators of vulnerable IP SLA operations. \n\nTo determine the Cisco IOS Software release that is running on a Cisco\nproduct, administrators can log in to the device and issue the \"show\nversion\" command to display the system banner. The system banner\nconfirms that the device is running Cisco IOS Software by displaying\ntext similar to \"Cisco Internetwork Operating System Software\" or \"Cisco\nIOS Software.\" The image name displays in parentheses, followed by\n\"Version\" and the Cisco IOS Software release name. Other Cisco devices\ndo not have the \"show version\" command or may provide different output. \n\nThe following example shows output from a device that runs a Cisco\nIOS Software image:\n\n Router\u003e show version\n Cisco IOS Software, C3900 Software (C3900-UNIVERSALK9-M), Version 15.0(1)M1, RELEASE SOFTWARE (fc1)\n Technical Support: http://www.cisco.com/techsupport\n Copyright (c) 1986-2009 by Cisco Systems, Inc. \n Compiled Wed 02-Dec-09 17:17 by prod_rel_team\n\n\n !--- output truncated\n\n\nAdditional information about Cisco IOS Software release naming\nconventions is available in the white paper Cisco IOS and NX-OS\nSoftware Reference Guide available at:\n\nhttp://www.cisco.com/web/about/security/intelligence/ios-ref.html\n\nProducts Confirmed Not Vulnerable\n+--------------------------------\n\nNo other Cisco products are currently known to be affected by this\nvulnerability. \n\nDetails\n=======\n\nIP SLA is an embedded agent in Cisco IOS Software designed to measure\nand monitor common network performance metrics like jitter, latency\n(delay), and packet loss. \n\nThe vulnerability that is described in this document is triggered by\nmalformed UDP packets triggered by malformed IP SLA packets sent to\nthe vulnerable device and port. A vulnerable device can be an IP SLA\nresponder or the source device of a vulnerable IP SLA operation. \n\nVulnerable IP SLA Responder Configurations\n+-----------------------------------------\n\nA device configured either as an IP SLA general responder or a\npermanent IP SLA UDP responder is vulnerable. \n\nThe general responder processes IP SLA control protocol packets on\nUDP port 1967 and then may dynamically open vulnerable UDP ports\naccording to the IP SLA operations requested using the control\nprotocol. The configuration for a general responder is as follows:\n\n ip sla responder\n\nThe IP SLA UDP permanent responder is also vulnerable. An example\nconfiguration is as follows:\n\n ip sla responder udp-echo port 300\n\nThere is no default UDP port number for the UDP permanent responder\n\nAlternatively, both the general responder and the permanent responder\ncan be identified with the \"show ip sla responder\" command. The general\nresponder is vulnerable when it has been enabled. The permanent\nresponder is vulnerable only when it has been enabled and the \"udpEcho\nResponder\" is present. In the Following example, the general responder\nis not vulnerable because it has not been enabled but the permanent\nresponder is vulnerable because it has been enabled with a UDP echo\nresponder:\n\n Router# show ip sla responder\n General IP SLA Responder on Control port 1967\n General IP SLA Responder is: Disabled\n\n Permanent Port IP SLA Responder\n Permanent Port IP SLA Responder is: Enabled\n\n udpEcho Responder: \n IP Address Port\n 0.0.0.0 300\n\nVulnerable IP SLA Source Device Configurations\n+---------------------------------------------\n\nAn IP SLA source device is a Cisco IOS device that has at least one\nIP SLA operation configured. To be vulnerable a probe originator\nneeds to have at least one scheduled probe that uses either of the\nfollowing IP SLA operations:\n\n * udp-jitter probe\n * udp-echo\n\nA vulnerable IP SLA source device configuration includes all the\nfollowing commands:\n\n * An \"ip sla\" global configuration command to define an IP SLA\n operation\n\n * Either a \"udp-echo\" or a \"udp-jitter\" IP SLA configuration command\n\n * An \"ip sla schedule\" global configuration command that activates\n one of the probes that uses a vulnerable IP SLA operation\n\nThe following examples show a source device that is configured for IP\nSLA UDP echo and UDP jitter probes:\n\n ip sla 201\n udp-echo 192.168.134.21 201\n ip sla schedule 201 start-time now\n\n ip sla 301\n udp-jitter 192.168.134.121 122\n ip sla schedule 301 start-time now\n\nThe destination UDP ports for the probes need to be configured. If\nthe source UDP port is not configured an available port number will\nbe used when the probe is started. A device that originates a\nvulnerable operation will be vulnerable on the source UDP ports of\nthe probe and a responder will be vulnerable on the destination UDP\nport used for the probe. \n\nIP SLA probes can be configured using Simple Network Management\nProtocol (SNMP). In that case, by default, the \"show running\nconfiguration\" command will not include the IP SLA probe\nconfiguration. The \"show ip sla configuration\" command can be used to\nverify whether a probe has been configured either by the command line\nor via SNMP. \n\n Router# show ip sla configuration | include operation\n Type of operation to perform: udp-jitter\n Type of operation to perform: udp-echo\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\n\n* CSCtk67073 (\"IP SLA Memory Corruption Vulnerability\")\n\nCVSS Base Score - 7.8\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 Exploitability - Functional\n Remediation Level - Official-Fix\n Report Confidence - Confirmed\n\n\nImpact\n======\n\nSuccessful exploitation of the vulnerability described in this\ndocument may result in the reload of a vulnerable device. \n\nSoftware Versions and Fixes\n===========================\n\nWhen considering software upgrades, also consult\nhttp://www.cisco.com/go/psirt and any subsequent advisories to determine\nexposure 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\nAdditionally, the Cisco IOS Software Checker is available on\nthe Cisco Security Intelligence Operations (SIO) portal at\nhttp://tools.cisco.com/security/center/selectIOSVersion.x. It provides\nseveral features for checking which Security Advisories affect specified\nversions of Cisco IOS Software. \n\nCisco IOS Software\n+-----------------\n\nEach row of the following Cisco IOS Software table corresponds to a\nCisco IOS Software train. If a particular train is vulnerable, the\nearliest releases that contain the fix are listed in the First Fixed\nRelease For This Advisory column. The First Fixed Release for All\nAdvisories in the September 2011 Bundled Publication column lists the\nearliest possible releases that correct all the published\nvulnerabilities in the Cisco IOS Software Security Advisory bundled\npublication. Cisco recommends upgrading to the latest available\nrelease, where possible. \n\n+------------------------------------------------------------+\n| Major | Availability of Repaired Releases |\n| Release | |\n|------------+-----------------------------------------------|\n| Affected | | First Fixed Release for |\n| 12.0-Based | First Fixed | All Advisories in the |\n| Releases | Release | September 2011 Bundled |\n| | | Publication |\n|------------------------------------------------------------|\n| There are no affected 12.0-based releases |\n|------------------------------------------------------------|\n| Affected | | First Fixed Release for |\n| 12.1-Based | First Fixed | All Advisories in the |\n| Releases | Release | September 2011 Bundled |\n| | | Publication |\n|------------------------------------------------------------|\n| There are no affected 12.1-based releases |\n|------------------------------------------------------------|\n| Affected | | First Fixed Release for |\n| 12.2-Based | First Fixed | All Advisories in the |\n| Releases | Release | September 2011 Bundled |\n| | | Publication |\n|------------------------------------------------------------|\n| There are no affected 12.2-based releases |\n|------------------------------------------------------------|\n| Affected | | First Fixed Release for |\n| 12.3-Based | First Fixed | All Advisories in the |\n| Releases | Release | September 2011 Bundled |\n| | | Publication |\n|------------------------------------------------------------|\n| There are no affected 12.3-based releases |\n|------------------------------------------------------------|\n| Affected | | First Fixed Release for |\n| 12.4-Based | First Fixed | All Advisories in the |\n| Releases | Release | September 2011 Bundled |\n| | | Publication |\n|------------------------------------------------------------|\n| There are no affected 12.4-based releases |\n|------------------------------------------------------------|\n| Affected | | First Fixed Release for |\n| 15.0-Based | First Fixed | All Advisories in the |\n| Releases | Release | September 2011 Bundled |\n| | | Publication |\n|------------------------------------------------------------|\n| There are no affected 15.0-based releases |\n|------------------------------------------------------------|\n| Affected | | First Fixed Release for |\n| 15.1-Based | First Fixed | All Advisories in the |\n| Releases | Release | September 2011 Bundled |\n| | | Publication |\n|------------+------------------+----------------------------|\n| | | Vulnerable; contact your |\n| | | support organization per |\n| 15.1EY | Not vulnerable | the instructions in the |\n| | | Obtaining Fixed Software |\n| | | section of this advisory. |\n|------------+------------------+----------------------------|\n| | Vulnerable; | Vulnerable; first fixed in |\n| 15.1GC | first fixed in | Release 15.1T |\n| | Release 15.1T | |\n|------------+------------------+----------------------------|\n| 15.1M | Not vulnerable | 15.1(4)M2; Available on |\n| | | 30-SEP-11 |\n|------------+------------------+----------------------------|\n| | | Vulnerable; contact your |\n| | | support organization per |\n| 15.1MR | Not vulnerable | the instructions in the |\n| | | Obtaining Fixed Software |\n| | | section of this advisory. |\n|------------+------------------+----------------------------|\n| | 15.1(2)S | 15.1(2)S2 |\n| | | |\n| | Cisco IOS XE | 15.1(3)S |\n| 15.1S | devices: Please | |\n| | see Cisco IOS-XE | Cisco IOS XE devices: |\n| | Software | Please see Cisco IOS-XE |\n| | Availability | Software Availability |\n|------------+------------------+----------------------------|\n| | 15.1(1)T3 | 15.1(1)T4; Available on |\n| | | 08-DEC-11 |\n| 15.1T | 15.1(2)T4 | |\n| | | 15.1(2)T4 |\n| | 15.1(3)T2 | |\n| | | 15.1(3)T2 |\n|------------+------------------+----------------------------|\n| | Vulnerable; | Vulnerable; first fixed in |\n| 15.1XB | first fixed in | Release 15.1T |\n| | Release 15.1T | |\n|------------+------------------+----------------------------|\n| Affected | | First Fixed Release for |\n| 15.2-Based | First Fixed | All Advisories in the |\n| Releases | Release | September 2011 Bundled |\n| | | Publication |\n|------------------------------------------------------------|\n| There are no affected 15.2-based releases |\n+------------------------------------------------------------+\n\nCisco IOS XE Software\n+--------------------\n\nCisco IOS XE Software is affected by the vulnerability disclosed in\nthis document. \n\n+------------------------------------------------------------+\n| Cisco | First Fixed | First Fixed Release for All |\n| IOS XE | Release | Advisories in the September |\n| Release | | 2011 Bundled Publication |\n|---------+-----------------+--------------------------------|\n| | Vulnerable; | Vulnerable; migrate to 3.3.2S |\n| 2.1.x | migrate to | or later |\n| | 3.3.2S or later | |\n|---------+-----------------+--------------------------------|\n| | Vulnerable; | Vulnerable; migrate to 3.3.2S |\n| 2.2.x | migrate to | or later |\n| | 3.3.2S or later | |\n|---------+-----------------+--------------------------------|\n| | Vulnerable; | Vulnerable; migrate to 3.3.2S |\n| 2.3.x | migrate to | or later |\n| | 3.3.2S or later | |\n|---------+-----------------+--------------------------------|\n| | Vulnerable; | Vulnerable; migrate to 3.3.2S |\n| 2.4.x | migrate to | or later |\n| | 3.3.2S or later | |\n|---------+-----------------+--------------------------------|\n| | Vulnerable; | Vulnerable; migrate to 3.3.2S |\n| 2.5.x | migrate to | or later |\n| | 3.3.2S or later | |\n|---------+-----------------+--------------------------------|\n| | Vulnerable; | Vulnerable; migrate to 3.3.2S |\n| 2.6.x | migrate to | or later |\n| | 3.3.2S or later | |\n|---------+-----------------+--------------------------------|\n| | Vulnerable; | Vulnerable; migrate to 3.3.2S |\n| 3.1.xS | migrate to | or later |\n| | 3.3.2S or later | |\n|---------+-----------------+--------------------------------|\n| | Vulnerable; | |\n| 3.1.xSG | migrate to | Vulnerable; migrate to 3.2.0SG |\n| | 3.2.0SG or | or later |\n| | later | |\n|---------+-----------------+--------------------------------|\n| | Vulnerable; | Vulnerable; migrate to 3.3.2S |\n| 3.2.xS | migrate to | or later |\n| | 3.3.2S or later | |\n|---------+-----------------+--------------------------------|\n| 3.2.xSG | Not vulnerable | Not vulnerable |\n|---------+-----------------+--------------------------------|\n| 3.3.xS | 3.3.0S | 3.3.2S |\n|---------+-----------------+--------------------------------|\n| 3.4.xS | Not vulnerable | Not vulnerable |\n+------------------------------------------------------------+\n\nFor mapping of Cisco IOS XE to Cisco IOS releases, please refer to\nthe Cisco IOS XE 2 Release Notes, Cisco IOS XE 3S Release Notes, and\nCisco IOS XE 3SG Release Notes. \n\nCisco IOS XR Software\n+--------------------\n\nCisco IOS XR Software is not affected by any of the vulnerabilities\nin the September 2011 bundled publication. \n\nWorkarounds\n===========\n\nThere are no workarounds for this vulnerability, but there are\nmitigations that can be deployed on a general IP SLA responder to\nreduce the exposure to this vulnerability. \n\nGeneral IP SLA Responder Mitigation\n+----------------------------------\n\nFor devices that are configured as general responders, a mitigation\nis to restrict IP SLA control packets on UDP port 1967 that are\naddressed to the vulnerable device to permit only trusted probe\noriginators to open UDP ports that could be exploited. This can be\naccomplished using techniques such as Infrastructure Access list or\nControl Plane Protection. \n\nFor devices configured as general responders, mitigation techniques\nthat can be deployed on Cisco devices within the network are\navailable in the Cisco Applied Mitigation Bulletin companion document\nfor this advisory:\n\nhttp://www.cisco.com/warp/public/707/cisco-amb-20110928-ipsla.shtml\n\nIP SLA Permanent Responder Mitigation\n+------------------------------------\n\nFor the permanent responder, the mitigation is to filter UDP packets\naddressed to the configured UDP port of each permanent responder to\npermit packets from the IP addresses of trusted devices. \n\nIP SLA Source Devices Mitigation\n+-------------------------------\n\nFor IP SLA source devices, a mitigation is to allow only UDP packets\nfrom trusted devices (that is, devices that are the target of IP SLA\noperations). \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\nsets they have purchased. By installing, downloading, accessing\nor otherwise using such software upgrades, customers agree to be\nbound by 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\nhttp://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\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-20110928-ipsla.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 1.0 | 2011-Sep-28 | Initial public release |\n+------------------------------------------------------------+\n\nCisco Security Procedures\n=========================\n\nComplete information on reporting security vulnerabilities\nin Cisco products, obtaining assistance with security\nincidents, and registering to receive security information\nfrom Cisco, is available on Cisco\u0027s worldwide website at\nhttp://www.cisco.com/en/US/products/products_security_vulnerability_policy.html. \nThis includes instructions for press inquiries regarding\nCisco security notices. All Cisco security advisories are available at\nhttp://www.cisco.com/ go/psirt. \n\n+--------------------------------------------------------------------\nCopyright 2010-2011 Cisco Systems, Inc. All rights reserved. \n+--------------------------------------------------------------------\n\n-----BEGIN PGP SIGNATURE-----\nVersion: GnuPG v1.4.11 (GNU/Linux)\n\niF4EAREIAAYFAk6Cp2MACgkQQXnnBKKRMNBZ6gD/WbLQXIuIcQjySn9TOSycPflx\np7H07864wibshk3qznsA/37viRZKYBrkXc+mgT5C5kIs9Elx3l+L5v0EDJ1K+jZI\n=OF08\n-----END PGP SIGNATURE-----\n",
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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.