var-200908-0260
Vulnerability from variot

Cisco IOS XR 3.4.0 through 3.8.1 allows remote attackers to cause a denial of service (session reset) via a BGP UPDATE message with an invalid attribute, as demonstrated in the wild on 17 August 2009. An attacker can exploit this issue to cause an affected device to restart the peering session. The resulting peering session will flap until the sender ceases to send the invalid update. This issue is being tracked by Cisco Bug ID CSCtb42995. Cisco IOS is an operating system developed by Cisco in the United States for its network equipment.

The vulnerability manifests when a BGP peer announces a prefix with a specific invalid attribute. On receipt of this prefix, the Cisco IOS XR device will restart the peering session by sending a notification.

This is a different vulnerability to what was disclosed in the Cisco Security Advisory "Cisco IOS Software Border Gateway Protocol 4-Byte Autonomous System Number Vulnerabilities" disclosed on the 2009 July 29 1600 UTC at the following link:

http://www.cisco.com/warp/public/707/cisco-sa-20090729-bgp.shtml

Cisco is preparing to release free software maintenance upgrade (SMU) that address this vulnerability. This advisory will be updated once the SMU is available.

A workaround that mitigates this vulnerability is available.

This advisory is posted at

http://www.cisco.com/warp/public/707/cisco-sa-20090818-bgp.shtml

Affected Products

This vulnerability affects all Cisco IOS XR software devices after and including software release 3.4.0 configured with BGP routing.

Vulnerable Products +------------------

To determine the Cisco IOS XR 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 XR Software by displaying text similar to "Cisco IOS XR Software". The software version is displayed after the text "Cisco IOS XR Software".

The following example identifies a Cisco CRS-1 that is running Cisco IOS XR Software Release 3.6.2:

RP/0/RP0/CPU0:CRS#show version
Tue Aug 18 14:25:17.407 AEST

Cisco IOS XR Software, Version 3.6.2[00]
Copyright (c) 2008 by Cisco Systems, Inc.

ROM: System Bootstrap, Version 1.49(20080319:195807) [CRS-1 ROMMON],

CRS uptime is 4 weeks, 4 days, 1 minute
System image file is "disk0:hfr-os-mbi-3.6.2/mbihfr-rp.vm"

cisco CRS-8/S (7457) processor with 4194304K bytes of memory. 
7457 processor at 1197Mhz, Revision 1.2

17 Packet over SONET/SDH network interface(s)
1 DWDM controller(s)
17 SONET/SDH Port controller(s)
8 TenGigabitEthernet/IEEE 802.3 interface(s)
2 Ethernet/IEEE 802.3 interface(s)
1019k bytes of non-volatile configuration memory. 
38079M bytes of hard disk. 
981440k bytes of ATA PCMCIA card at disk 0 (Sector size 512 bytes).

Configuration register on node 0/0/CPU0 is 0x102
Boot device on node 0/0/CPU0 is mem:


!--- output truncated

The following example identifies a Cisco 12404 router that is running Cisco IOS XR Software Release 3.7.1:

RP/0/0/CPU0:GSR#show version

Cisco IOS XR Software, Version 3.7.1[00]
Copyright (c) 2008 by Cisco Systems, Inc.

ROM: System Bootstrap, Version 12.0(20051020:160303) SOFTWARE
Copyright (c) 1994-2005 by cisco Systems,  Inc.

GSR uptime is 3 weeks, 6 days, 3 hours, 20 minutes
System image file is "disk0:c12k-os-mbi-3.7.1/mbiprp-rp.vm"

cisco 12404/PRP (7457) processor with 2097152K bytes of memory. 
7457 processor at 1266Mhz, Revision 1.2

1 Cisco 12000 Series Performance Route Processor
1 Cisco 12000 Series - Multi-Service Blade Controller
1 1 Port ISE Packet Over SONET OC-48c/STM-16 Controller (1 POS)
1 Cisco 12000 Series SPA Interface Processor-601/501/401
3 Ethernet/IEEE 802.3 interface(s)
1 SONET/SDH Port controller(s)
1 Packet over SONET/SDH network interface(s)
4 PLIM QoS controller(s)
8 FastEthernet/IEEE 802.3 interface(s)
1016k bytes of non-volatile configuration memory. 
1000496k bytes of disk0: (Sector size 512 bytes). 
65536k bytes of Flash internal SIMM (Sector size 256k).

Configuration register on node 0/0/CPU0 is 0x2102
Boot device on node 0/0/CPU0 is disk0:


!--- output truncated

Additional information about Cisco IOS XR software release naming conventions is available in the "White Paper: Cisco IOS Reference Guide" at the following link:

http://www.cisco.com/warp/public/620/1.html#t6

Additional information about Cisco IOS XR software time-based release model is available in the "White Paper: Guidelines for Cisco IOS XR Software" at the following link:

http://www.cisco.com/en/US/prod/collateral/iosswrel/ps8803/ps5845/product_bulletin_c25-478699.html

BGP is configured in Cisco IOS XR software with the configuration command router bgp [AS Number] or router bgp [X.Y]. The device is vulnerable if it is running affected Cisco IOS XR version and has BGP configured.

The following example shows a Cisco IOS XR software device configured with BGP:

RP/0/0/CPU0:GSR#show running-config | begin router bgp
Building configuration... 
router bgp 65535
 bgp router-id 192.168.0.1
 address-family ipv4 unicast
  network 192.168.1.1/32
 !
 address-family vpnv4 unicast
 !
 neighbor 192.168.2.1
  remote-as 65534
  update-source Loopback0
  address-family ipv4 unicast
  !


!--- output truncated

Products Confirmed Not Vulnerable +--------------------------------

The following Cisco products are confirmed not vulnerable:

  • Cisco IOS Software
  • Cisco IOS XR Software prior to release 3.4.0
  • Cisco IOS XR Software not configured for BGP routing

No other Cisco products are currently known to be affected by this vulnerability.

When receiving the invalid update the receiving Cisco IOS XR software device will display a log message like the following example:

RP/0/RP0/CPU0:Aug 17 13:47:05.896 GMT: bgp[122]: %ROUTING-BGP-5-ADJCHANGE : neighbor 192.168.0.1 Down - BGP Notification sent: invalid or corrupt AS path

The peering session will flap until the sender stops sending the invalid/corrupt prefix.

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

CSCtb42995 - Cisco IOS XR Software Border Gateway Protocol Vulnerability +-----------------------------------------------------

CVSS Base Score - 4.3

    Access Vector            - Network
    Access Complexity        - Medium
    Authentication           - None
    Confidentiality Impact   - None
    Integrity Impact         - None
    Availability Impact      - Partial

CVSS Temporal Score - 3.9

    Exploitability           - Functional
    Remediation Level        - Unavailable
    Report Confidence        - Confirmed

Impact

Successful exploitation of the vulnerability may result in BGP peering sessions continuously being reset. This may lead to routing inconsistencies and a denial of service for those affected networks.

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.

+---------------------------------------+ | Cisco IOS XR Version | SMU ID | |----------------------+----------------| | 3.2.X | Not Vulnerable | |----------------------+----------------| | 3.3.X | Not vulnerable | |----------------------+----------------| | 3.4.0 | Pending | |----------------------+----------------| | 3.4.1 | Pending | |----------------------+----------------| | 3.4.2 | Pending | |----------------------+----------------| | 3.4.3 | Pending | |----------------------+----------------| | 3.5.2 | Pending | |----------------------+----------------| | 3.5.3 | Pending | |----------------------+----------------| | 3.5.4 | Pending | |----------------------+----------------| | 3.6.0 | Pending | |----------------------+----------------| | 3.6.1 | Pending | |----------------------+----------------| | 3.6.2 | Pending | |----------------------+----------------| | 3.6.3 | Pending | |----------------------+----------------| | 3.7.0 | Pending | |----------------------+----------------| | 3.7.1 | Pending | |----------------------+----------------| | 3.7.2 | Pending | |----------------------+----------------| | 3.7.3 | Pending | |----------------------+----------------| | 3.8.0 | Pending | |----------------------+----------------| | 3.8.1 | Pending | +---------------------------------------+

Workarounds

There are no workarounds on the affected device itself. Co-ordination is required with the peering neighbor support staff to filter the invalid update on their outbound path. The following procedure explains how to help mitigate this vulnerability:

Using the peer IP address in the log message that was generated when the Cisco IOS XR software device received the invalid update; capture the notification message hex dump from the CLI command show bgp neighbor and contact the Cisco TAC whom can assist with a decode. Details on how to contact Cisco TAC are contained within the section "Obtaining Fixed Software" of this advisory.

The following example show an example generated log message when receiving the invalid update, and the details to be captured to be sent to the Cisco TAC for decoding:

Log message generated when receiving invalid update:

RP/0/RP0/CPU0:Aug 17 13:47:05.896 GMT: bgp[122]: %ROUTING-BGP-5-ADJCHANGE : neighbor 192.168.0.1 Down - BGP Notification sent: invalid or corrupt AS path

Information to capture for decoding by the Cisco TAC, is the output from show bgp neighbors [ip address of neighbor from above log message]. 

RP/0/RP0/CPU0:CRS#show bgp neighbors 192.168.0.1

<capture output and provide to Cisco TAC>

Working with Cisco TAC, the decode of the above will display the AS path in a manner illustrated below. 

ATTRIBUTE NAME:  AS_PATH

 AS_PATH: Type 2 is AS_SEQUENCE
 AS_PATH: Segment Length is 4 (0x04) segments long
 AS_PATH: 65533  65532 65531 65531

Working cooperatively with your peering partner, request that they filter outbound prefix advertisements from the identified source AS (in this example 65531) for your peering session. The filters configuration methods will vary depending on the routing device operating system used. For Cisco IOS XR the filters will be applied using Routing Policy Language (RPL) policies or with Cisco IOS software via applying route-maps that deny advertisements matching that AS in their AS-PATH. Once these policies are applied, the peering session will be re-established.

For further information on Cisco IOS XR RPL consult the document "Implementing Routing Policy on Cisco IOS XR Software" at the following link:

http://www.cisco.com/en/US/docs/ios_xr_sw/iosxr_r3.0/routing/configuration/guide/rc3rpl.html#wp1118699

For further information on Cisco IOS route maps with BGP, consult the document "Cisco IOS BGP Configuration Guide, Release 12.4T" at the following link:

http://www.cisco.com/en/US/docs/ios/12_2sr/12_2srb/feature/guide/tbgp_c.html

Obtaining Fixed Software

Cisco will be releasing free software updates that address this vulnerability. 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

On August 17, 2009 around 16:30-17:00 UTC several ISP's began experiencing connectivity issues as BGP sessions were being repeatedly reset. Cisco TAC was engaged with a number of customers all seeing similar issues. Stability came a few hours afterward as workarounds were applied. At this time, it is not believed that the connectivity issues were the result of malicious activity.

Status of this Notice: INTERIM

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. CISCO EXPECTS TO UPDATE THIS DOCUMENT AS NEW INFORMATION BECOMES AVAILABLE.

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-20090818-bgp.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-August-18 | 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

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    "data": "Cisco IOS XR 3.4.0 through 3.8.1 allows remote attackers to cause a denial of service (session reset) via a BGP UPDATE message with an invalid attribute, as demonstrated in the wild on 17 August 2009. \nAn attacker can exploit this issue to cause an affected device to restart the peering session.  The resulting peering session will flap until the sender ceases to send the invalid update. \nThis issue is being tracked by Cisco Bug ID CSCtb42995. Cisco IOS is an operating system developed by Cisco in the United States for its network equipment. \n\nThe vulnerability manifests when a BGP peer announces a prefix with a\nspecific invalid attribute. On receipt of this prefix, the Cisco IOS\nXR device will restart the peering session by sending a notification. \n\nThis is a different vulnerability to what was disclosed in the Cisco\nSecurity Advisory \"Cisco IOS Software Border Gateway Protocol 4-Byte\nAutonomous System Number Vulnerabilities\" disclosed on the 2009 July\n29 1600 UTC at the following link: \n\nhttp://www.cisco.com/warp/public/707/cisco-sa-20090729-bgp.shtml\n\nCisco is preparing to release free software maintenance upgrade (SMU)\nthat address this vulnerability. This advisory will be updated once\nthe SMU is available. \n\nA workaround that mitigates this vulnerability is available. \n\nThis advisory is posted at \n\nhttp://www.cisco.com/warp/public/707/cisco-sa-20090818-bgp.shtml\n\nAffected Products\n=================\n\nThis vulnerability affects all Cisco IOS XR software devices after\nand including software release 3.4.0 configured with BGP routing. \n\nVulnerable Products\n+------------------\n\nTo determine the Cisco IOS XR Software release that is running on a\nCisco product, administrators can log in to the device and issue the \nshow version command to display the system banner. The system banner\nconfirms that the device is running Cisco IOS XR Software by\ndisplaying text similar to \"Cisco IOS XR Software\". The software\nversion is displayed after the text \"Cisco IOS XR Software\". \n\nThe following example identifies a Cisco CRS-1 that is running Cisco\nIOS XR Software Release 3.6.2:\n\n    RP/0/RP0/CPU0:CRS#show version\n    Tue Aug 18 14:25:17.407 AEST\n    \n    Cisco IOS XR Software, Version 3.6.2[00]\n    Copyright (c) 2008 by Cisco Systems, Inc. \n    \n    ROM: System Bootstrap, Version 1.49(20080319:195807) [CRS-1 ROMMON],\n    \n    CRS uptime is 4 weeks, 4 days, 1 minute\n    System image file is \"disk0:hfr-os-mbi-3.6.2/mbihfr-rp.vm\"\n    \n    cisco CRS-8/S (7457) processor with 4194304K bytes of memory. \n    7457 processor at 1197Mhz, Revision 1.2\n    \n    17 Packet over SONET/SDH network interface(s)\n    1 DWDM controller(s)\n    17 SONET/SDH Port controller(s)\n    8 TenGigabitEthernet/IEEE 802.3 interface(s)\n    2 Ethernet/IEEE 802.3 interface(s)\n    1019k bytes of non-volatile configuration memory. \n    38079M bytes of hard disk. \n    981440k bytes of ATA PCMCIA card at disk 0 (Sector size 512 bytes). \n    \n    Configuration register on node 0/0/CPU0 is 0x102\n    Boot device on node 0/0/CPU0 is mem:\n    \n    \n    !--- output truncated\n    \n    \n\nThe following example identifies a Cisco 12404 router that is running\nCisco IOS XR Software Release 3.7.1:\n\n    RP/0/0/CPU0:GSR#show version\n    \n    Cisco IOS XR Software, Version 3.7.1[00]\n    Copyright (c) 2008 by Cisco Systems, Inc. \n    \n    ROM: System Bootstrap, Version 12.0(20051020:160303) SOFTWARE\n    Copyright (c) 1994-2005 by cisco Systems,  Inc. \n    \n    GSR uptime is 3 weeks, 6 days, 3 hours, 20 minutes\n    System image file is \"disk0:c12k-os-mbi-3.7.1/mbiprp-rp.vm\"\n    \n    cisco 12404/PRP (7457) processor with 2097152K bytes of memory. \n    7457 processor at 1266Mhz, Revision 1.2\n    \n    1 Cisco 12000 Series Performance Route Processor\n    1 Cisco 12000 Series - Multi-Service Blade Controller\n    1 1 Port ISE Packet Over SONET OC-48c/STM-16 Controller (1 POS)\n    1 Cisco 12000 Series SPA Interface Processor-601/501/401\n    3 Ethernet/IEEE 802.3 interface(s)\n    1 SONET/SDH Port controller(s)\n    1 Packet over SONET/SDH network interface(s)\n    4 PLIM QoS controller(s)\n    8 FastEthernet/IEEE 802.3 interface(s)\n    1016k bytes of non-volatile configuration memory. \n    1000496k bytes of disk0: (Sector size 512 bytes). \n    65536k bytes of Flash internal SIMM (Sector size 256k). \n    \n    Configuration register on node 0/0/CPU0 is 0x2102\n    Boot device on node 0/0/CPU0 is disk0:\n    \n    \n    !--- output truncated\n    \n    \n\nAdditional information about Cisco IOS XR software release naming\nconventions is available in the \"White Paper: Cisco IOS Reference\nGuide\" at the following link: \n\nhttp://www.cisco.com/warp/public/620/1.html#t6\n\nAdditional information about Cisco IOS XR software time-based release\nmodel is available in the \"White Paper: Guidelines for Cisco IOS XR\nSoftware\" at the following link: \n\nhttp://www.cisco.com/en/US/prod/collateral/iosswrel/ps8803/ps5845/product_bulletin_c25-478699.html\n\nBGP is configured in Cisco IOS XR software with the configuration\ncommand router bgp [AS Number] or router bgp [X.Y]. The device is\nvulnerable if it is running affected Cisco IOS XR version and has BGP\nconfigured. \n\nThe following example shows a Cisco IOS XR software device configured\nwith BGP:\n\n    RP/0/0/CPU0:GSR#show running-config | begin router bgp\n    Building configuration... \n    router bgp 65535\n     bgp router-id 192.168.0.1\n     address-family ipv4 unicast\n      network 192.168.1.1/32\n     !\n     address-family vpnv4 unicast\n     !\n     neighbor 192.168.2.1\n      remote-as 65534\n      update-source Loopback0\n      address-family ipv4 unicast\n      !\n    \n    \n    !--- output truncated\n    \n    \n\nProducts Confirmed Not Vulnerable\n+--------------------------------\n\nThe following Cisco products are confirmed not vulnerable:\n\n  * Cisco IOS Software\n  * Cisco IOS XR Software prior to release 3.4.0\n  * Cisco IOS XR Software not configured for BGP routing\n\nNo other Cisco products are currently known to be affected by this\nvulnerability. \n\nWhen receiving the invalid update the receiving Cisco IOS XR software\ndevice will display a log message like the following example:\n\n    RP/0/RP0/CPU0:Aug 17 13:47:05.896 GMT: bgp[122]: %ROUTING-BGP-5-ADJCHANGE : neighbor 192.168.0.1 Down - BGP Notification sent: invalid or corrupt AS path \n    \n\nThe peering session will flap until the sender stops sending the\ninvalid/corrupt prefix. \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\nCSCtb42995 - Cisco IOS XR Software Border Gateway Protocol Vulnerability\n+-----------------------------------------------------\n\nCVSS Base Score - 4.3\n\n        Access Vector            - Network\n        Access Complexity        - Medium\n        Authentication           - None\n        Confidentiality Impact   - None\n        Integrity Impact         - None\n        Availability Impact      - Partial\n\nCVSS Temporal Score - 3.9\n\n        Exploitability           - Functional\n        Remediation Level        - Unavailable\n        Report Confidence        - Confirmed\n\n\nImpact\n======\n\nSuccessful exploitation of the vulnerability may result in BGP\npeering sessions continuously being reset. This may lead to routing\ninconsistencies and a denial of service for those affected networks. \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\n+---------------------------------------+\n| Cisco IOS XR Version |     SMU ID     |\n|----------------------+----------------|\n| 3.2.X                | Not Vulnerable |\n|----------------------+----------------|\n| 3.3.X                | Not vulnerable |\n|----------------------+----------------|\n| 3.4.0                | Pending        |\n|----------------------+----------------|\n| 3.4.1                | Pending        |\n|----------------------+----------------|\n| 3.4.2                | Pending        |\n|----------------------+----------------|\n| 3.4.3                | Pending        |\n|----------------------+----------------|\n| 3.5.2                | Pending        |\n|----------------------+----------------|\n| 3.5.3                | Pending        |\n|----------------------+----------------|\n| 3.5.4                | Pending        |\n|----------------------+----------------|\n| 3.6.0                | Pending        |\n|----------------------+----------------|\n| 3.6.1                | Pending        |\n|----------------------+----------------|\n| 3.6.2                | Pending        |\n|----------------------+----------------|\n| 3.6.3                | Pending        |\n|----------------------+----------------|\n| 3.7.0                | Pending        |\n|----------------------+----------------|\n| 3.7.1                | Pending        |\n|----------------------+----------------|\n| 3.7.2                | Pending        |\n|----------------------+----------------|\n| 3.7.3                | Pending        |\n|----------------------+----------------|\n| 3.8.0                | Pending        |\n|----------------------+----------------|\n| 3.8.1                | Pending        |\n+---------------------------------------+\n\nWorkarounds\n===========\n\nThere are no workarounds on the affected device itself. Co-ordination\nis required with the peering neighbor support staff to filter the\ninvalid update on their outbound path. The following procedure\nexplains how to help mitigate this vulnerability:\n\nUsing the peer IP address in the log message that was generated when\nthe Cisco IOS XR software device received the invalid update; capture\nthe notification message hex dump from the CLI command show bgp\nneighbor and contact the Cisco TAC whom can assist with a decode. \nDetails on how to contact Cisco TAC are contained within the section\n\"Obtaining Fixed Software\" of this advisory. \n\nThe following example show an example generated log message when\nreceiving the invalid update, and the details to be captured to be\nsent to the Cisco TAC for decoding:\n\nLog message generated when receiving invalid update:\n\n    RP/0/RP0/CPU0:Aug 17 13:47:05.896 GMT: bgp[122]: %ROUTING-BGP-5-ADJCHANGE : neighbor 192.168.0.1 Down - BGP Notification sent: invalid or corrupt AS path \n    \n\nInformation to capture for decoding by the Cisco TAC, is the output\nfrom show bgp neighbors [ip address of neighbor from above log\nmessage]. \n\n    RP/0/RP0/CPU0:CRS#show bgp neighbors 192.168.0.1        \n    \n    \u003ccapture output and provide to Cisco TAC\u003e\n    \n\nWorking with Cisco TAC, the decode of the above will display the AS\npath in a manner illustrated below. \n\n    ATTRIBUTE NAME:  AS_PATH\n    \n     AS_PATH: Type 2 is AS_SEQUENCE\n     AS_PATH: Segment Length is 4 (0x04) segments long\n     AS_PATH: 65533  65532 65531 65531\n    \n\nWorking cooperatively with your peering partner, request that they\nfilter outbound prefix advertisements from the identified source AS\n(in this example 65531) for your peering session. The filters\nconfiguration methods will vary depending on the routing device\noperating system used. For Cisco IOS XR the filters will be applied\nusing Routing Policy Language (RPL) policies or with Cisco IOS\nsoftware via applying route-maps that deny advertisements matching\nthat AS in their AS-PATH. Once these policies are applied, the\npeering session will be re-established. \n\nFor further information on Cisco IOS XR RPL consult the document\n\"Implementing Routing Policy on Cisco IOS XR Software\" at the\nfollowing link: \n\nhttp://www.cisco.com/en/US/docs/ios_xr_sw/iosxr_r3.0/routing/configuration/guide/rc3rpl.html#wp1118699\n\nFor further information on Cisco IOS route maps with BGP, consult the\ndocument \"Cisco IOS BGP Configuration Guide, Release 12.4T\" at the\nfollowing link: \n\nhttp://www.cisco.com/en/US/docs/ios/12_2sr/12_2srb/feature/guide/tbgp_c.html\n\nObtaining Fixed Software\n========================\n\nCisco will be releasing free software updates that address this\nvulnerability. Prior to deploying software, customers should consult\ntheir maintenance provider or check the software for feature set\ncompatibility 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 by\nthe 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\nOn August 17, 2009 around 16:30-17:00 UTC several ISP\u0027s began\nexperiencing connectivity issues as BGP sessions were being\nrepeatedly reset. Cisco TAC was engaged with a number of customers\nall seeing similar issues. Stability came a few hours afterward as\nworkarounds were applied. At this time, it is not believed that the\nconnectivity issues were the result of malicious activity. \n\nStatus of this Notice: INTERIM\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. CISCO EXPECTS TO UPDATE THIS DOCUMENT AS NEW\nINFORMATION BECOMES AVAILABLE. \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-20090818-bgp.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-August-18 | 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.  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