[cisco-ttl] Cisco Security Advisory: Cisco IOS Multicast Virtual Private Network (MVPN) Data Leak

From: Cisco Systems Product Security Incident Response Team <psirt_at_....>
Date: Wed, 26 Mar 2008 17:00:00 +0100


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Cisco Security Advisory: Cisco IOS Multicast Virtual Private Network

                         (MVPN) Data Leak

Advisory ID: cisco-sa-20080326-mvpn

http://www.cisco.com/warp/public/707/cisco-sa-20080326-mvpn.shtml

Revision 1.0

For Public Release 2008 March 26 1600 UTC (GMT)

Summary


A vulnerability in the Cisco implementation of Multicast Virtual Private Network (MVPN) is subject to exploitation that can allow a malicious user to create extra multicast states on the core routers or receive multicast traffic from other Multiprotocol Label Switching (MPLS) based Virtual Private Networks (VPN) by sending specially crafted messages.

Cisco has released free software updates that address this vulnerability. Workarounds that mitigate this vulnerability are available.

This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20080326-mvpn.shtml

Note: The March 26, 2008 publication includes five Security Advisories. The Advisories all affect Cisco IOS. Each Advisory lists the releases that correct the vulnerability described in the Advisory, and the Advisories also detail the releases that correct the vulnerabilities in all five Advisories. Please reference the following software table to find a release that fixes all published Security Advisories as of March 26th, 2008.

Individual publication links are listed below:

Affected Products


Vulnerable Products

+------------------

Devices that run Cisco IOS and are configured for MVPN are affected.

An IOS device that is configured for MVPN has a line that is similar to this in the running configuration example:

    mdt default <group-address>

In order to determine the software that runs on a Cisco IOS product, log in to the device and issue the show version command to display the system banner. Cisco IOS® software identifies itself as "Internetwork Operating System Software" or simply "IOS." On the next line of output, the image name displays between parentheses, followed by "Version" and the Cisco IOS release name. Other Cisco devices do not have the "show version" command or give different output.

The following example shows output from a device that runs an IOS image:

    Router>show version

        Cisco IOS Software, 7200 Software (C7200-IK9S-M), Version 12.3(14)T1, RELEASE SOFTWARE (fc1)
        Technical Support: http://www.cisco.com/techsupport
        Copyright (c) 1986-2005 by Cisco Systems, Inc.
        Compiled Thu 31-Mar-05 08:04 by yiyan

Additional information about Cisco IOS release naming is available at the following link:
http://www.cisco.com/en/US/products/sw/iosswrel/ps1828/products_white_paper09186a008018305e.shtml.

Products Confirmed Not Vulnerable

+--------------------------------

No other Cisco products, including IOS XR software, are currently known to be affected by this vulnerability.

Details


MVPN architecture introduces an additional set of protocols and procedures that help enable a service provider to support multicast traffic in an MPLS VPN. MVPN allows the transparent transport of IP multicast traffic across the MPLS VPN backbone of a provider and allows a service provider to offer multicast services to MPLS VPN customers.

A vulnerability exists in the implementation of MVPN that allows an attacker to send specially crafted Multicast Distribution Tree (MDT) Data Join messages that can cause the creation of extra multicast states on the core routers. MDT Data Join messages can be sent in unicast or multicast. The vulnerability can also allow leaking multicast traffic from different MPLS VPNs. It is possible to receive multicast traffic from VPNs that are not connected to the same Provider Edge (PE) router. In order to successfully exploit this vulnerability, an attacker needs to know or guess the Border Gateway Protocol (BGP) peering IP address of a remote PE router and the address of the multicast group that is used in other MPLS VPNs.

This vulnerability is documented in the Cisco Bug ID CSCsi01470 and has been assigned Common Vulnerabilities and Exposures (CVE) ID CVE-2008-1156. 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

CSCsi01470 - Crafted MDT Data Join TLV in VRF causes multicast state

  CVSS Base Score - 7.5

  Access Vector:          Network
  Access Complexity:      Low
  Authentication:         None

  Confidentiality Impact: Partial
  Integrity Impact:       Partial

  Availability Impact: Partial

  CVSS Temporal Score - 6.2

  Exploitability:         Functional
  Remediation Level:      Official-Fix
  Report Confidence:      Confirmed

Impact


Successful exploitation of the vulnerability can result in the creation of extra multicast states on the core routers or the leaking of multicast traffic from one MPLS VPN to another.

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  |
|  Release   |         Releases          |
|------------+---------------------------|
|  Affected  | First Fixed | Recommended |
| 12.0-Based |   Release   |   Release   |
|  Releases  |             |             |
|------------+-------------+-------------|
| 12.0       | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.0DA     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.0DB     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.0DC     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | 12.0(32)S9  |             |
| 12.0S      |             | 12.0(32)S10 |
|            | 12.0(33)S   |             |
|------------+-------------+-------------|
| 12.0SC     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.0SL     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.0SP     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.0ST     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.0SX     | first fixed | 12.0(32)S10 |
|            | in 12.0S    |             |
|------------+-------------+-------------|
| 12.0SY     | 12.0(32)SY4 | 12.0(32)SY5 |
|------------+-------------+-------------|
| 12.0SZ     | 12.0(30)SZ4 | 12.0(32)S10 |
|------------+-------------+-------------|
| 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  |             |
|------------+-------------+-------------|
| 12.0XV     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.0XW     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|  Affected  | First Fixed | Recommended |
| 12.1-Based |   Release   |   Release   |
|  Releases  |             |             |
|----------------------------------------|
|    There are no affected 12.1 based    |
|                releases                |
|----------------------------------------|
|  Affected  | First Fixed | Recommended |
| 12.2-Based |   Release   |   Release   |
|  Releases  |             |             |
|------------+-------------+-------------|
| 12.2       | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2B      | first fixed | 12.4(18a)   |
|            | in 12.4     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2BC     | first fixed | 12.3(23)BC1 |
|            | in 12.3BC   |             |
|------------+-------------+-------------|
| 12.2BW     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2BY     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2BZ     | first fixed |             |
|            | in 12.3XI   |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2CX     | first fixed | 12.3(23)BC1 |
|            | in 12.3BC   |             |
|------------+-------------+-------------|
| 12.2CY     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2CZ     | Vulnerable; |             |
|            | contact TAC |             |
|------------+-------------+-------------|
| 12.2DA     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2DD     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2DX     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            |             | 12.2(25)    |
|            |             | EWA13       |
|            | Vulnerable; |             |
| 12.2EU     | first fixed | 12.2(31)    |
|            | in 12.2SG   | SGA5        |
|            |             |             |
|            |             | 12.2(44)SG  |
|------------+-------------+-------------|
|            |             | 12.2(25)    |
|            |             | EWA13       |
|            | Vulnerable; |             |
| 12.2EW     | first fixed | 12.2(31)    |
|            | in 12.2SG   | SGA5        |
|            |             |             |
|            |             | 12.2(44)SG  |
|------------+-------------+-------------|
|            | 12.2(25)    |             |
|            | EWA10       | 12.2(25)    |
| 12.2EWA    |             | EWA13       |
|            | 12.2(25)    |             |
|            | EWA11       |             |
|------------+-------------+-------------|
| 12.2EX     | 12.2(37)EX  | 12.2(40)EX1 |
|------------+-------------+-------------|
| 12.2EY     | 12.2(37)EY  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2EZ     | first fixed |             |
|            | in 12.2SEE  |             |
|------------+-------------+-------------|
| 12.2FX     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2FY     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2FZ     | first fixed | 12.2(44)SE1 |
|            | in 12.2SE   |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2IXA    | first fixed |             |
|            | in 12.2IXD  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2IXB    | first fixed |             |
|            | in 12.2IXD  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2IXC    | first fixed |             |
|            | in 12.2IXD  |             |
|------------+-------------+-------------|
| 12.2IXD    | 12.2(18)    |             |
|            | IXD1        |             |
|------------+-------------+-------------|
| 12.2IXE    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2JA     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2JK     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2MB     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2MC     | 12.2(15)    | 12.4(18a)   |
|            | MC2h        |             |
|------------+-------------+-------------|
|            | 12.2(14)S18 |             |
|            |             |             |
|            | 12.2(18)S13 |             |
| 12.2S      |             | 12.2(25)S15 |
|            | 12.2(20)S14 |             |
|            |             |             |
|            | 12.2(25)S13 |             |
|------------+-------------+-------------|
|            | 12.2(28)SB7 |             |
|            |             |             |
|            | 12.2(31)SB5 |             |
| 12.2SB     |             | 12.2(28)    |
|            | 12.2(33)SB; | SB12        |
|            | Available   |             |
|            | on          |             |
|            | 31-MAR-08   |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
|            | first fixed |             |
| 12.2SBC    | in 12.2SB;  | 12.2(28)    |
|            | Available   | SB12        |
|            | on          |             |
|            | 31-MAR-08   |             |
|------------+-------------+-------------|
| 12.2SCA    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | 12.2(35)SE4 |             |
| 12.2SE     |             | 12.2(44)SE1 |
|            | 12.2(37)SE  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2SEA    | first fixed |             |
|            | in 12.2SEE  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2SEB    | first fixed |             |
|            | in 12.2SEE  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2SEC    | first fixed |             |
|            | in 12.2SEE  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2SED    | first fixed |             |
|            | in 12.2SEE  |             |
|------------+-------------+-------------|
| 12.2SEE    | 12.2(25)    |             |
|            | SEE4        |             |
|------------+-------------+-------------|
| 12.2SEF    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2SEG    | 12.2(25)    | 12.2(25)    |
|            | SEG3        | SEG4        |
|------------+-------------+-------------|
|            | 12.2(25)SG2 |             |
|            |             |             |
|            | 12.2(31)SG2 |             |
| 12.2SG     |             | 12.2(44)SG  |
|            | 12.2(37)SG1 |             |
|            |             |             |
|            | 12.2(40)SG  |             |
|------------+-------------+-------------|
|            | 12.2(31)    |             |
|            | SGA2        |             |
|            |             |             |
|            | 12.2(31)    |             |
|            | SGA3        | 12.2(31)    |
| 12.2SGA    |             | SGA5        |
|            | 12.2(31)    |             |
|            | SGA6;       |             |
|            | Available   |             |
|            | on          |             |
|            | 07-APR-08   |             |
|------------+-------------+-------------|
| 12.2SL     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2SM     | 12.2(29)SM2 |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2SO     | migrate to  | 12.2(29)SVD |
|            | any release |             |
|            | in 12.2SVA  |             |
|------------+-------------+-------------|
| 12.2SRA    | 12.2(33)    | 12.2(33)    |
|            | SRA4        | SRA7        |
|------------+-------------+-------------|
|            |             | 12.2(33)    |
|            | 12.2(33)    | SRB3;       |
| 12.2SRB    | SRB1        | Available   |
|            |             | on          |
|            |             | 31-MAR-08   |
|------------+-------------+-------------|
| 12.2SRC    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2SU     | first fixed | 12.4(18a)   |
|            | in 12.4     |             |
|------------+-------------+-------------|
| 12.2SV     | 12.2(29b)SV | 12.2(29b)SV |
|------------+-------------+-------------|
| 12.2SVA    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2SVC    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2SVD    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2SW     | 12.2(25)    |             |
|            | SW11        |             |
|------------+-------------+-------------|
|            | Vulnerable; | 12.2(18)    |
| 12.2SX     | first fixed | SXF13       |
|            | in 12.2SXF  |             |
|------------+-------------+-------------|
|            | Vulnerable; | 12.2(18)    |
| 12.2SXA    | first fixed | SXF13       |
|            | in 12.2SXF  |             |
|------------+-------------+-------------|
|            | Vulnerable; | 12.2(18)    |
| 12.2SXB    | first fixed | SXF13       |
|            | in 12.2SXF  |             |
|------------+-------------+-------------|
|            | Vulnerable; | 12.2(18)    |
| 12.2SXD    | first fixed | SXF13       |
|            | in 12.2SXF  |             |
|------------+-------------+-------------|
|            | Vulnerable; | 12.2(18)    |
| 12.2SXE    | first fixed | SXF13       |
|            | in 12.2SXF  |             |
|------------+-------------+-------------|
|            | 12.2(18)    |             |
|            | SXF10       |             |
|            |             |             |
| 12.2SXF    | 12.2(18)    | 12.2(18)    |
|            | SXF10a      | SXF13       |
|            |             |             |
|            | 12.2(18)    |             |
|            | SXF12a      |             |
|------------+-------------+-------------|
| 12.2SXH    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | Vulnerable; | 12.2(18)    |
| 12.2SY     | first fixed | SXF13       |
|            | in 12.2SXF  |             |
|------------+-------------+-------------|
|            |             | 12.2(25)S15 |
|            | Vulnerable; |             |
| 12.2SZ     | first fixed | 12.2(28)    |
|            | in 12.2S    | SB12        |
|            |             |             |
|            |             | 12.2(33)SRC |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2T      | first fixed | 12.3(26)    |
|            | in 12.3     |             |
|------------+-------------+-------------|
| 12.2TPC    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
|            | first fixed |             |
| 12.2UZ     | in 12.2SB;  | 12.2(28)    |
|            | Available   | SB12        |
|            | on          |             |
|            | 31-MAR-08   |             |
|------------+-------------+-------------|
| 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     | 12.2(33)XN1 | 12.3(26)    |
|------------+-------------+-------------|
| 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  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2YH     | first fixed | 12.3(26)    |
|            | in 12.3     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2YJ     | first fixed | 12.3(26)    |
|            | in 12.3     |             |
|------------+-------------+-------------|
| 12.2YK     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2YL     | first fixed | 12.4(18a)   |
|            | in 12.4     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2YM     | first fixed | 12.4(18a)   |
|            | in 12.4     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2YN     | first fixed | 12.4(18a)   |
|            | in 12.4     |             |
|------------+-------------+-------------|
| 12.2YO     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.2YP     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2YQ     | first fixed | 12.4(18a)   |
|            | in 12.4     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2YR     | first fixed | 12.4(18a)   |
|            | in 12.4     |             |
|------------+-------------+-------------|
| 12.2YS     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2YT     | first fixed | 12.3(26)    |
|            | in 12.3     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2YU     | first fixed | 12.4(18a)   |
|            | in 12.4     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2YV     | first fixed | 12.4(18a)   |
|            | in 12.4     |             |
|------------+-------------+-------------|
| 12.2YW     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2YX     | first fixed | 12.4(18a)   |
|            | in 12.4     |             |
|------------+-------------+-------------|
| 12.2YY     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            |             | 12.2(25)S15 |
|            | Vulnerable; |             |
| 12.2YZ     | first fixed | 12.2(28)    |
|            | in 12.2S    | SB12        |
|            |             |             |
|            |             | 12.2(33)SRC |
|------------+-------------+-------------|
|            | Vulnerable; | 12.2(18)    |
| 12.2ZA     | first fixed | SXF13       |
|            | in 12.2SXF  |             |
|------------+-------------+-------------|
| 12.2ZB     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2ZC     | first fixed | 12.4(18a)   |
|            | in 12.4     |             |
|------------+-------------+-------------|
| 12.2ZD     | Vulnerable; |             |
|            | contact TAC |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2ZE     | first fixed | 12.3(26)    |
|            | in 12.3     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2ZF     | first fixed | 12.4(18a)   |
|            | in 12.4     |             |
|------------+-------------+-------------|
|            | Vulnerable; | 12.4(15)T4  |
| 12.2ZG     | first fixed |             |
|            | in 12.3YG   | 12.4(18a)   |
|------------+-------------+-------------|
| 12.2ZH     | 12.2(13)ZH9 | 12.2(13)    |
|            |             | ZH11        |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2ZJ     | first fixed | 12.4(18a)   |
|            | in 12.4     |             |
|------------+-------------+-------------|
|            | Vulnerable; | 12.4(15)T4  |
| 12.2ZL     | first fixed |             |
|            | in 12.4     | 12.4(18a)   |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2ZP     | first fixed | 12.4(18a)   |
|            | in 12.4     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.2ZU     | migrate to  | 12.2(33)    |
|            | any release | SXH2        |
|            | in 12.2SXH  |             |
|------------+-------------+-------------|
| 12.2ZY     | 12.2(18)ZY1 | 12.2(18)ZY2 |
|------------+-------------+-------------|
|  Affected  | First Fixed | Recommended |
| 12.3-Based |   Release   |   Release   |
|  Releases  |             |             |
|------------+-------------+-------------|
|            | 12.3(17c)   |             |
|            |             |             |
|            | 12.3(18a)   |             |
|            |             |             |
|            | 12.3(19a)   |             |
|            |             |             |
| 12.3       | 12.3(20a)   | 12.3(26)    |
|            |             |             |
|            | 12.3(21b)   |             |
|            |             |             |
|            | 12.3(22a)   |             |
|            |             |             |
|            | 12.3(23)    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.3B      | first fixed | 12.4(18a)   |
|            | in 12.4     |             |
|------------+-------------+-------------|
|            | 12.3(17b)   |             |
|            | BC8         |             |
|            |             |             |
| 12.3BC     | 12.3(21a)   | 12.3(23)BC1 |
|            | BC2         |             |
|            |             |             |
|            | 12.3(23)BC  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.3BW     | first fixed | 12.4(18a)   |
|            | in 12.4     |             |
|------------+-------------+-------------|
| 12.3EU     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.3JA     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.3JEA    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.3JEB    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.3JEC    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | Releases    |             |
|            | prior to    |             |
|            | 12.3(8)JK1  |             |
|            | are         |             |
| 12.3JK     | vulnerable, | 12.3(8)JK1  |
|            | release     |             |
|            | 12.3(8)JK1  |             |
|            | and later   |             |
|            | are not     |             |
|            | vulnerable; |             |
|------------+-------------+-------------|
| 12.3JL     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.3JX     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.3T      | first fixed | 12.4(18a)   |
|            | in 12.4     |             |
|------------+-------------+-------------|
| 12.3TPC    | 12.3(4)     |             |
|            | TPC11b      |             |
|------------+-------------+-------------|
| 12.3VA     | Vulnerable; |             |
|            | contact TAC |             |
|------------+-------------+-------------|
|            |             | 12.3(2)XA7; |
| 12.3XA     | 12.3(2)XA6  | Available   |
|            |             | on          |
|            |             | 31-MAR-08   |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.3XB     | first fixed | 12.4(18a)   |
|            | in 12.4     |             |
|------------+-------------+-------------|
|            |             | 12.4(15)T4  |
| 12.3XC     | 12.3(2)XC5  |             |
|            |             | 12.4(18a)   |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.3XD     | first fixed | 12.4(18a)   |
|            | in 12.4     |             |
|------------+-------------+-------------|
|            |             | 12.4(15)T4  |
| 12.3XE     | 12.3(2)XE5  |             |
|            |             | 12.4(18a)   |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.3XF     | first fixed | 12.4(18a)   |
|            | in 12.4     |             |
|------------+-------------+-------------|
|            | Vulnerable; | 12.4(15)T4  |
| 12.3XG     | first fixed |             |
|            | in 12.3YG   | 12.4(18a)   |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.3XH     | first fixed | 12.4(18a)   |
|            | in 12.4     |             |
|------------+-------------+-------------|
| 12.3XI     | 12.3(7)     |             |
|            | XI10a       |             |
|------------+-------------+-------------|
|            | Vulnerable; | 12.3(14)    |
| 12.3XJ     | first fixed | YX11        |
|            | in 12.3YX   |             |
|            |             | 12.4(15)T4  |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.3XK     | first fixed | 12.4(18a)   |
|            | in 12.4     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.3XQ     | first fixed | 12.4(18a)   |
|            | in 12.4     |             |
|------------+-------------+-------------|
|            |             | 12.3(7)XR8; |
| 12.3XR     | 12.3(7)XR7  | Available   |
|            |             | on          |
|            |             | 31-MAR-08   |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.3XS     | first fixed | 12.4(18a)   |
|            | in 12.4     |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.3XU     | first fixed | 12.4(15)T4  |
|            | in 12.4T    |             |
|------------+-------------+-------------|
|            | Vulnerable; | 12.3(14)    |
| 12.3XW     | first fixed | YX11        |
|            | in 12.3YX   |             |
|            |             | 12.4(15)T4  |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.3XY     | first fixed | 12.4(18a)   |
|            | in 12.4     |             |
|------------+-------------+-------------|
|            | Vulnerable; | 12.4(15)T4  |
| 12.3YA     | first fixed |             |
|            | in 12.4     | 12.4(18a)   |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.3YD     | first fixed | 12.4(15)T4  |
|            | in 12.4T    |             |
|------------+-------------+-------------|
|            | Vulnerable; | 12.3(14)    |
| 12.3YF     | first fixed | YX11        |
|            | in 12.3YX   |             |
|            |             | 12.4(15)T4  |
|------------+-------------+-------------|
| 12.3YG     | 12.3(8)YG6  | 12.4(15)T4  |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.3YH     | first fixed | 12.4(15)T4  |
|            | in 12.4T    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.3YI     | first fixed | 12.4(15)T4  |
|            | in 12.4T    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.3YJ     | first fixed | 12.4(15)T4  |
|            | in 12.4T    |             |
|------------+-------------+-------------|
| 12.3YK     | 12.3(11)YK3 | 12.4(15)T4  |
|------------+-------------+-------------|
| 12.3YM     | 12.3(14)    | 12.3(14)    |
|            | YM10        | YM12        |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.3YQ     | first fixed | 12.4(15)T4  |
|            | in 12.4T    |             |
|------------+-------------+-------------|
| 12.3YS     | 12.3(11)YS2 | 12.4(15)T4  |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.3YT     | first fixed | 12.4(15)T4  |
|            | in 12.4T    |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.3YU     | first fixed |             |
|            | in 12.4XB   |             |
|------------+-------------+-------------|
| 12.3YX     | 12.3(14)YX9 | 12.3(14)    |
|            |             | YX11        |
|------------+-------------+-------------|
| 12.3YZ     | 12.3(11)YZ2 |             |
|------------+-------------+-------------|
|  Affected  | First Fixed | Recommended |
| 12.4-Based |   Release   |   Release   |
|  Releases  |             |             |
|------------+-------------+-------------|
|            | 12.4(10c)   |             |
|            |             |             |
|            | 12.4(12b)   |             |
|            |             |             |
|            | 12.4(13c)   |             |
|            |             |             |
|            | 12.4(16)    |             |
|            |             |             |
| 12.4       | 12.4(17a)   | 12.4(18a)   |
|            |             |             |
|            | 12.4(3h)    |             |
|            |             |             |
|            | 12.4(5c)    |             |
|            |             |             |
|            | 12.4(7f)    |             |
|            |             |             |
|            | 12.4(8d)    |             |
|------------+-------------+-------------|
| 12.4JA     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.4JK     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.4JMA    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.4JMB    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.4JMC    | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.4JX     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
|            |             | 12.4(15)MD; |
| 12.4MD     | 12.4(11)MD1 | Available   |
|            |             | on          |
|            |             | 09-MAY-08   |
|------------+-------------+-------------|
| 12.4MR     | 12.4(12)MR2 | 12.4(16)MR2 |
|------------+-------------+-------------|
| 12.4SW     | 12.4(11)SW3 | 12.4(15)SW  |
|------------+-------------+-------------|
|            | 12.4(11)T3  |             |
|            |             |             |
|            | 12.4(15)T   |             |
|            |             |             |
|            | 12.4(2)T6   |             |
| 12.4T      |             | 12.4(15)T4  |
|            | 12.4(4)T8   |             |
|            |             |             |
|            | 12.4(6)T8   |             |
|            |             |             |
|            | 12.4(9)T4   |             |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.4XA     | first fixed | 12.4(15)T4  |
|            | in 12.4T    |             |
|------------+-------------+-------------|
| 12.4XB     | 12.4(2)XB6  |             |
|------------+-------------+-------------|
| 12.4XC     | 12.4(4)XC7  |             |
|------------+-------------+-------------|
| 12.4XD     | 12.4(4)XD8  | 12.4(4)XD10 |
|------------+-------------+-------------|
| 12.4XE     | 12.4(6)XE2  | 12.4(15)T4  |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.4XF     | first fixed | 12.4(15)T4  |
|            | in 12.4T    |             |
|------------+-------------+-------------|
| 12.4XG     | 12.4(9)XG2  | 12.4(9)XG2  |
|------------+-------------+-------------|
| 12.4XJ     | 12.4(11)XJ4 | 12.4(15)T4  |
|------------+-------------+-------------|
|            | Vulnerable; |             |
| 12.4XK     | first fixed | 12.4(15)T4  |
|            | in 12.4T    |             |
|------------+-------------+-------------|
| 12.4XL     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.4XM     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.4XN     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.4XT     | 12.4(6)XT1  | 12.4(6)XT2  |
|------------+-------------+-------------|
| 12.4XV     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.4XW     | Not         |             |
|            | Vulnerable  |             |
|------------+-------------+-------------|
| 12.4XY     | Not         |             |
|            | Vulnerable  |             |
+----------------------------------------+

Workarounds


The workaround for this vulnerability consists of filtering MDT Data Join packets on the PE device.

The workarounds need to be applied on all Virtual Routing and Forwarding (VRF) interfaces of all PE routers. Otherwise, attackers can target remote PE routers and can still exploit this vulnerability.

Even if only one PE router in the network runs an unfixed version of IOS code, it is vulnerable to packets that come from systems that are connected to remote PE routers. In such a case, workarounds need to be deployed on all PE routers to successfully mitigate this vulnerability.

The "mdt data <group> <mask>" or "mdt data <group> <mask> threshold <n> list <acl>" commands do not mitigate this vulnerability.

Filtering Packets to UDP Port 3232

+---------------------------------

MDT Data Join messages are sent to UDP port 3232. Creating an access-list that filters destination UDP port 3232 and applying it on the VRF interface of the PE router mitigates this vulnerability. Such an access-list looks like this:

    access-list 100 deny udp any any eq 3232     access-list 100 permit ip any any     

    interface Serial 0/0

      ip vrf forwarding <vpn-1>
      ...
      ip access-group 100 in

Note that this access-list can also filter legitimate traffic that is destined to UDP port 3232. In such a case, the access-list can be modified to be more specific by providing individual BGP peer IP addresses. This is explained in the section that follows.

Filtering BGP Peer IP Addresses on the VRF Interface

+---------------------------------------------------

In order to successfully exploit this vulnerability, an attacker needs to send MDT Data Join messages by spoofing the packets from the IP address of one of the existing iBGP peers. Because MDT Data Join messages are only used between PE routers, the packets from CE devices can safely be filtered.

Creating an access-list that filters iBGP peer IP addresses as source addresses and applying it on the VRF interface of the PE router mitigates this vulnerability. The access-list needs to filter all iBGP peer IP addresses. Such an access-list looks like this example:

    access-list 100 deny udp host <ibgp-peer-1> any eq 3232     access-list 100 deny udp host <ibgp-peer-2> any eq 3232     ...
    access-list 100 deny udp host <ibgp-peer-n> any eq 3232     access-list 100 permit ip any any     

    interface Serial 0/0

      ip vrf forwarding <vpn-1>
      ...
      ip access-group 100 in

Additional 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-20080326-mvpn.shtml

Obtaining Fixed Software


Cisco has released 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/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 psirt_at_cisco.com or security-alert_at_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.

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 Thomas Morin.

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-20080326-mvpn.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.

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-March-26 | 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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