-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Cisco Security Advisory: Cisco IOS MPLS VPN May Leak Information
Advisory ID: cisco-sa-20080924-vpn http://www.cisco.com/warp/public/707/cisco-sa-20080924-vpn.shtml Revision 1.0 For Public Release 2008 September 24 1600 UTC (GMT) - --------------------------------------------------------------------- Summary ======= Devices running Cisco IOS versions 12.0S, 12.2, 12.3 or 12.4 and configured for Multiprotocol Label Switching (MPLS) Virtual Private Networks (VPNs) or VPN Routing and Forwarding Lite (VRF Lite) and using Border Gateway Protocol (BGP) between Customer Edge (CE) and Provider Edge (PE) devices may permit information to propagate between VPNs. Workarounds are available to help mitigate this vulnerability. This issue is triggered by a logic error when processing extended communities on the PE device. This issue cannot be deterministically exploited by an attacker. Cisco has released free software updates that address these vulnerabilities. Workarounds that mitigate these vulnerabilities are available. This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20080924-vpn.shtml NOTE: The September 24, 2008 IOS Advisory bundled publication includes twelve Security Advisories. Eleven of the advisories address vulnerabilities in Cisco's IOS software, and one advisory addresses vulnerabilities in Cisco Unified Communications Manager. Each Advisory lists the releases that correct the vulnerability described in the Advisory. Please reference the following software table to find a release that fixes all published IOS software Advisories as of September 24th, 2008: http://www.cisco.com/warp/public/707/cisco-sa-20080924-bundle.shtml Individual publication links are listed below: * http://www.cisco.com/warp/public/707/cisco-sa-20080924-iosips.shtml * http://www.cisco.com/warp/public/707/cisco-sa-20080924-ssl.shtml * http://www.cisco.com/warp/public/707/cisco-sa-20080924-sip.shtml * http://www.cisco.com/warp/public/707/cisco-sa-20080924-cucm.shtml * http://www.cisco.com/warp/public/707/cisco-sa-20080924-mfi.shtml * http://www.cisco.com/warp/public/707/cisco-sa-20080924-ipc.shtml * http://www.cisco.com/warp/public/707/cisco-sa-20080924-ubr.shtml * http://www.cisco.com/warp/public/707/cisco-sa-20080924-multicast.shtml * http://www.cisco.com/warp/public/707/cisco-sa-20080924-sccp.shtml * http://www.cisco.com/warp/public/707/cisco-sa-20080924-iosfw.shtml * http://www.cisco.com/warp/public/707/cisco-sa-20080924-l2tp.shtml Affected Products ================= Products running Cisco IOS versions 12.0S, 12.2, 12.3 or 12.4 and configured for MPLS VPNs or VRF Lite are potentially affected. Cisco IOS releases based on 12.1 are not affected. Vulnerable Products +------------------ Cisco IOS devices are vulnerable if they are configured for MPLS VPN or VRF Lite and have a BGP session between the CE and PE devices, and process extended communities. If a device is configured for MPLS VPN or VRF Lite the command address-family ipv4 vrf <vrf-name> or address-family ipv6 vrf <vrf-name> will be present in the device configuration. The following shows a command executed on a device configured for MPLS VPN: router#show running-config | include address-family [ipv4|ipv6] address-family ipv4 vrf <vrf-name> The following shows a PE device configured for an IPv4 BGP session between the PE and the CE: router bgp <Local AS> address-family ipv4 vrf one neighbor <neighbor IP> remote-as < Remote AS> neighbor <neighbor IP> activate To determine the software running on a Cisco product, log in to the device and issue the "show version" command to display the system banner. Cisco IOS software will identify itself as "Internetwork Operating System Software" or simply "IOS". On the next line of output, the image name will be displayed between parentheses, followed by "Version" and the IOS release name. Other Cisco devices will not have the "show version" command or will give different output. The following example identifies a Cisco product that is running Cisco IOS release 12.4(11)T2: Router#show version Cisco IOS Software, 7200 Software (C7200-ADVSECURITYK9-M), Version 12.4(11)T2, RELEASE SOFTWARE (fc4) Technical Support: http://www.cisco.com/techsupport Copyright (c) 1986-2007 by Cisco Systems, Inc. Compiled Tue 01-May-07 04:19 by prod_rel_team <output truncated> Additional information on the Cisco IOS release naming conventions can be found on the document entitled "White Paper: Cisco IOS Reference Guide", which is available at http://www.cisco.com/warp/public/620/1.html Products Confirmed Not Vulnerable +-------------------------------- Cisco products not configured for MPLS VPNs or VRF Lite are unaffected by this vulnerability. Cisco products that do not run IOS are unaffected by this vulnerability. Cisco IOS-XR is not affected. No other Cisco products are currently known to be affected by this vulnerability. Details ======= MPLS VPNs allow for the creation of 'virtual networks' that customers can use to segregate traffic into multiple, isolated VPNs. Traffic within each MPLS VPN is kept separate from the others, thereby maintaining a virtual private network. More information on MPLS and MPLS VPNs is available at the following link: http://www.cisco.com/en/US/products/ps6557/products_ios_technology_home.html A bug exists when processing extended communities with MPLS VPNs. If extended communities are used, MPLS VPN may incorrectly use a corrupted route target (RT) to forward traffic. If this occurs, traffic can leak from one MPLS VPN to another. This vulnerability exists whenever an affected PE device has a BGP session running in the MPLS VPN Virtual Routing and Forwarding (VRF). The following two examples of this scenario are the most common: 1) MPLS VPN configuration with BGP running inside the VRF between the PE and CE devices. 2) MPLS Inter-AS option A with BGP running between the Autonomous System Border Routers (ASBR). The mitigation in the Workarounds section filters extended communities on a PE device, preventing them from being received by devices configured for MPLS VPN. This vulnerability was introduced with Cisco bug ID CSCee83237. Cisco IOS images that do not include CSCee83237 are not vulnerable to this issue. It is important to note that this condition cannot be triggered by an attacker and that the condition does not provide ways to determine the flow of traffic between VPNs. This vulnerability is documented in the Cisco Bug ID CSCec12299 and has been assigned Common Vulnerabilities and Exposures (CVE) ID CVE-2008-3803. Vulnerability Scoring Details ============================= Cisco has provided scores for the vulnerabilities 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 CVSS Base Score - 5.1 Access Vector - Network Access Complexity - High Authentication - None Confidentiality Impact - Partial Integrity Impact - Partial Availability Impact - Partial CVSS Temporal Score - 4.2 Exploitability - Functional Remediation Level - Official-Fix Report Confidence - Confirmed Impact ====== This vulnerability may cause traffic to be improperly routed between MPLS VPNs, which may lead to a breach of confidentiality. 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 | | Recommended | | 12.0-Based | First Fixed Release | Release | | Releases | | | |--------------+----------------------------------+-----------------| | 12.0 | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.0DA | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.0DB | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.0DC | Not Vulnerable | | |--------------+----------------------------------+-----------------| | | 12.0(30)S5 | | | | | 12.0(32)S11 | | 12.0S | 12.0(31)S3 | | | | | 12.0(33)S1 | | | 12.0(32)S | | |--------------+----------------------------------+-----------------| | 12.0SC | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.0SL | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.0SP | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.0ST | Not Vulnerable | | |--------------+----------------------------------+-----------------| | | | 12.0(32)S11 | | 12.0SX | Vulnerable; first fixed in 12.0S | | | | | 12.0(33)S1 | |--------------+----------------------------------+-----------------| | 12.0SY | Not Vulnerable | | |--------------+----------------------------------+-----------------| | | | 12.0(32)S11 | | 12.0SZ | 12.0(30)SZ4 | | | | | 12.0(33)S1 | |--------------+----------------------------------+-----------------| | 12.0T | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.0W | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.0WC | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.0WT | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.0XA | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.0XB | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.0XC | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.0XD | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.0XE | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.0XF | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.0XG | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.0XH | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.0XI | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.0XJ | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.0XK | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.0XL | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.0XM | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.0XN | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.0XQ | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.0XR | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.0XS | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.0XT | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.0XV | Not Vulnerable | | |--------------+----------------------------------+-----------------| | Affected | | Recommended | | 12.1-Based | First Fixed Release | Release | | Releases | | | |-------------------------------------------------------------------| | There are no affected 12.1 based releases | |-------------------------------------------------------------------| | Affected | | Recommended | | 12.2-Based | First Fixed Release | 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 | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.2EWA | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.2EX | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.2EY | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.2EZ | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.2FX | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.2FY | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.2FZ | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.2IRB | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.2IXA | Vulnerable; migrate to any | 12.2(18)IXG | | | release in 12.2IXD | | |--------------+----------------------------------+-----------------| | 12.2IXB | Vulnerable; migrate to any | 12.2(18)IXG | | | release in 12.2IXD | | |--------------+----------------------------------+-----------------| | 12.2IXC | Vulnerable; migrate to any | 12.2(18)IXG | | | release in 12.2IXD | | |--------------+----------------------------------+-----------------| | 12.2IXD | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.2IXE | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.2IXF | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.2IXG | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.2JA | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.2JK | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.2MB | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.2MC | Not Vulnerable | | |--------------+----------------------------------+-----------------| | | 12.2(30)S and later are | 12.2(33)SB2; | | 12.2S | vulnerable. 12.2(25)S and before | Available on | | | are not vulnerable | 26-SEP-08 | |--------------+----------------------------------+-----------------| | | 12.2(28)SB5 | | | | | 12.2(33)SB2; | | 12.2SB | 12.2(31)SB2 | Available on | | | | 26-SEP-08 | | | 12.2(31)SB3x | | |--------------+----------------------------------+-----------------| | | Vulnerable; first fixed in | 12.2(33)SB2; | | 12.2SBC | 12.2SB | Available on | | | | 26-SEP-08 | |--------------+----------------------------------+-----------------| | 12.2SCA | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.2SE | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.2SEA | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.2SEB | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.2SEC | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.2SED | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.2SEE | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.2SEF | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.2SEG | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.2SG | 12.2(37)SG | 12.2(46)SG1 | |--------------+----------------------------------+-----------------| | 12.2SGA | 12.2(31)SGA8 | 12.2(31)SGA8 | |--------------+----------------------------------+-----------------| | 12.2SL | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.2SM | 12.2(29)SM2 | 12.2(29)SM4 | |--------------+----------------------------------+-----------------| | 12.2SO | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.2SRA | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.2SRB | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.2SRC | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.2SU | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.2SV | 12.2(29b)SV1 | | |--------------+----------------------------------+-----------------| | 12.2SVA | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.2SVC | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.2SVD | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.2SW | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.2SX | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.2SXA | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.2SXB | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.2SXD | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.2SXE | Vulnerable; first fixed in | 12.2(18)SXF15 | | | 12.2SXF | | |--------------+----------------------------------+-----------------| | 12.2SXF | 12.2(18)SXF3 | 12.2(18)SXF15 | |--------------+----------------------------------+-----------------| | 12.2SXH | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.2SY | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.2SZ | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 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 | | |--------------+----------------------------------+-----------------| | 12.2XN | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.2XNA | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.2XNB | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.2XO | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 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 | | |--------------+----------------------------------+-----------------| | 12.2ZU | Not Vulnerable | | |--------------+----------------------------------+-----------------| | | Vulnerable; first fixed in | 12.2(33)SB2; | | 12.2ZX | 12.2SB | Available on | | | | 26-SEP-08 | |--------------+----------------------------------+-----------------| | 12.2ZY | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.2ZYA | Not Vulnerable | | |--------------+----------------------------------+-----------------| | Affected | | Recommended | | 12.3-Based | First Fixed Release | Release | | Releases | | | |--------------+----------------------------------+-----------------| | 12.3 | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.3B | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.3BC | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.3BW | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.3EU | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.3JA | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.3JEA | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.3JEB | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.3JEC | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.3JK | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.3JL | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.3JX | Not Vulnerable | | |--------------+----------------------------------+-----------------| | | | 12.4(15)T7 | | 12.3T | Vulnerable; first fixed in 12.4 | | | | | 12.4(18c) | |--------------+----------------------------------+-----------------| | 12.3TPC | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.3VA | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.3XA | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.3XB | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.3XC | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.3XD | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.3XE | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.3XF | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.3XG | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.3XI | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.3XJ | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.3XK | Not Vulnerable | | |--------------+----------------------------------+-----------------| | | | 12.4(15)T7 | | 12.3XL | Vulnerable; first fixed in 12.4 | | | | | 12.4(18c) | |--------------+----------------------------------+-----------------| | 12.3XQ | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.3XR | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.3XS | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.3XU | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.3XW | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.3XX | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.3XY | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.3XZ | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.3YA | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.3YD | Not Vulnerable | | |--------------+----------------------------------+-----------------| | | Vulnerable; first fixed in | 12.3(14)YX13 | | 12.3YF | 12.3YX | | | | | 12.4(15)T7 | |--------------+----------------------------------+-----------------| | 12.3YG | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.3YH | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.3YI | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.3YJ | Vulnerable; first fixed in 12.4T | 12.4(15)T7 | |--------------+----------------------------------+-----------------| | 12.3YK | 12.3(11)YK3 | 12.4(15)T7 | |--------------+----------------------------------+-----------------| | | | 12.3(14)YM13; | | 12.3YM | 12.3(14)YM10 | Available on | | | | 30-SEP-08 | |--------------+----------------------------------+-----------------| | 12.3YQ | Vulnerable; first fixed in 12.4T | 12.4(15)T7 | |--------------+----------------------------------+-----------------| | 12.3YS | 12.3(11)YS2 | 12.4(15)T7 | |--------------+----------------------------------+-----------------| | 12.3YT | Vulnerable; first fixed in 12.4T | 12.4(15)T7 | |--------------+----------------------------------+-----------------| | | | 12.4(2)XB10 | | | Vulnerable; first fixed in | | | 12.3YU | 12.4XB | 12.4(9)XG3 | | | | | | | | 12.4(15)T7 | |--------------+----------------------------------+-----------------| | 12.3YX | 12.3(14)YX7 | 12.3(14)YX13 | |--------------+----------------------------------+-----------------| | 12.3YZ | 12.3(11)YZ2 | | |--------------+----------------------------------+-----------------| | 12.3ZA | Not Vulnerable | | |--------------+----------------------------------+-----------------| | Affected | | Recommended | | 12.4-Based | First Fixed Release | Release | | Releases | | | |--------------+----------------------------------+-----------------| | | 12.4(10c) | | | | | | | | 12.4(12a) | | | | | | | | 12.4(13) | | | | | | | 12.4 | 12.4(3h) | 12.4(18c) | | | | | | | 12.4(5c) | | | | | | | | 12.4(7e) | | | | | | | | 12.4(8d) | | |--------------+----------------------------------+-----------------| | 12.4JA | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.4JK | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.4JL | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.4JMA | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.4JMB | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.4JMC | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.4JX | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.4MD | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.4MR | Not Vulnerable | | |--------------+----------------------------------+-----------------| | | | 12.4(15)SW2; | | 12.4SW | 12.4(11)SW1 | Available on | | | | 28-SEP-08 | |--------------+----------------------------------+-----------------| | | 12.4(11)T2 | | | | | | | | 12.4(15)T | | | | | | | | 12.4(2)T6 | | | 12.4T | | 12.4(15)T7 | | | 12.4(4)T8 | | | | | | | | 12.4(6)T7 | | | | | | | | 12.4(9)T3 | | |--------------+----------------------------------+-----------------| | 12.4XA | Vulnerable; first fixed in 12.4T | 12.4(15)T7 | |--------------+----------------------------------+-----------------| | 12.4XB | 12.4(2)XB6 | 12.4(2)XB10 | |--------------+----------------------------------+-----------------| | 12.4XC | 12.4(4)XC7 | 12.4(15)T7 | |--------------+----------------------------------+-----------------| | | | 12.4(4)XD11; | | 12.4XD | 12.4(4)XD7 | Available on | | | | 26-SEP-08 | |--------------+----------------------------------+-----------------| | 12.4XE | 12.4(6)XE3 | 12.4(15)T7 | |--------------+----------------------------------+-----------------| | 12.4XF | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.4XG | 12.4(9)XG2 | 12.4(9)XG3 | |--------------+----------------------------------+-----------------| | 12.4XJ | 12.4(11)XJ2 | 12.4(15)T7 | |--------------+----------------------------------+-----------------| | 12.4XK | Vulnerable; first fixed in 12.4T | 12.4(15)T7 | |--------------+----------------------------------+-----------------| | 12.4XL | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.4XM | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.4XN | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.4XP | Vulnerable; contact TAC | | |--------------+----------------------------------+-----------------| | 12.4XQ | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.4XR | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.4XT | 12.4(6)XT1 | 12.4(15)T7 | |--------------+----------------------------------+-----------------| | 12.4XV | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.4XW | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.4XY | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.4XZ | Not Vulnerable | | |--------------+----------------------------------+-----------------| | 12.4YA | Not Vulnerable | | +-------------------------------------------------------------------+ Workarounds =========== Customers running versions of Cisco IOS that support filtering of extended communities can prevent the corruption of the route target (RT) by applying a BGP route-map that removes RT entries on inbound BGP sessions. The following configuration example applied in the ipv4 address family of a PE device removes extended communities from the CE router: router bgp <Local AS> address-family ipv4 vrf one neighbor <neighbor IP> remote-as <Remote AS> neighbor <neighbor IP> activate neighbor <neighbor IP> route-map FILTER in exit-address-family ! ip extcommunity-list 100 permit _RT.*_ ! ! route-map FILTER permit 10 set extcomm-list 100 delete ! The following configuration example applied in the ipv6 address family of a PE device removes extended communities from the CE router: router bgp <Local AS> address-family ipv6 vrf one neighbor <neighbor IP> remote-as <Remote AS> neighbor <neighbor IP> activate neighbor <neighbor IP> route-map FILTER in exit-address-family ! ip extcommunity-list 100 permit _RT.*_ ! ! route-map FILTER permit 10 set extcomm-list 100 delete ! Note: The capability of filtering extended communities is only available in certain 12.0S and 12.2S based Cisco IOS releases. BGP session between the PE and the CE needs to cleared to make this configuration change effective. 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/products/prod_warranties_item09186a008088e31f.html or as otherwise set forth at Cisco.com Downloads at http://www.cisco.com/public/sw-center/sw-usingswc.shtml Do not contact [EMAIL PROTECTED] or [EMAIL PROTECTED] 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: [EMAIL PROTECTED] 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/warp/public/687/Directory/DirTAC.shtml 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 reported to Cisco by a customer. This vulnerability cannot be deterministically triggered by an attacker. 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-20080924-vpn.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. * [EMAIL PROTECTED] * [EMAIL PROTECTED] * [EMAIL PROTECTED] * [EMAIL PROTECTED] * [EMAIL PROTECTED] * [EMAIL PROTECTED] * full-disclosure@lists.grok.org.uk * [EMAIL PROTECTED] 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 | 2008-Sep-24 | 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) iEYEARECAAYFAkjaLeoACgkQ86n/Gc8U/uCNwQCdEOd3v5A+paECb9s2gMBUr0JH DEwAnRtvu3aQrECRin/QmElp7oudHZJX =EVLU -----END PGP SIGNATURE----- _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/
