Advisory ID: cisco-sa-20100324-ldp

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20100324-ldp

Revision 1.1

Last Updated  2012 September 21 19:10  UTC (GMT)

For Public Release 2010 March 24 00:00  UTC (GMT)


Contents

Summary
Affected Products
Details
Vulnerability Scoring Details
Impact
Software Versions and Fixes
Workarounds
Obtaining Fixed Software
Exploitation and Public Announcements
Status of this Notice: Final
Distribution
Revision History
Cisco Security Procedures

Summary

A device running Cisco IOS® Software, Cisco IOS XE Software, or Cisco IOS XR Software is vulnerable to a remote denial of service (DoS) condition if it is configured for Multiprotocol Label Switching (MPLS) and has support for Label Distribution Protocol (LDP).

A crafted LDP UDP packet can cause an affected device running Cisco IOS Software or Cisco IOS XE Software to reload. On devices running affected versions of Cisco IOS XR Software, such packets can cause the device to restart the mpls_ldp process.

A system is vulnerable if configured with either LDP or Tag Distribution Protocol (TDP).

Cisco has released free software updates that address this vulnerability.

Workarounds that mitigate this vulnerability are available.

This advisory is posted at http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20100324-ldp.

Note: The March 24, 2010, Cisco IOS Software Security Advisory bundled publication includes seven Security Advisories. All the advisories address vulnerabilities in Cisco IOS Software. Each advisory lists the releases that correct the vulnerability or vulnerabilities detailed in the advisory. The table at this URL lists releases that correct all Cisco IOS Software vulnerabilities that have been published on March 24, 2010, or earlier:

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20100324-bundle

Individual publication links are in "Cisco Event Response: Semiannual Cisco IOS Software Security Advisory Bundled Publication" at this link:

http://www.cisco.com/web/about/security/intelligence/Cisco_ERP_mar10.html

Affected Products

Cisco IOS Software, Cisco IOS XE Software, and Cisco IOS XR Software devices are vulnerable if they are configured to listen for either targeted LDP hello messages or link LDP hello messages.

All versions of Cisco IOS Software and Cisco IOS XE Software that support MPLS are affected. Cisco IOS XR Software is affected in releases prior to 3.5.2.

Vulnerable Products

Several features within Cisco IOS Software, Cisco IOS XE Software, and Cisco IOS XR Software require the device to listen for either targeted LDP hello messages or link LDP hello messages. The most reliable way to determine if the device is configured to listen to LDP hello messages, is to log into the device and perform these actions:

  1. Confirm whether MPLS forwarding is enabled.
    A device that has MPLS forwarding disabled, is not vulnerable.

    Cisco IOS Software and Cisco IOS XE Software

    MPLS forwarding is enabled by default in Cisco IOS Software and Cisco IOS XE Software via the CLI command mpls ip. A device that has MPLS forwarding disabled, will have the global configuration command no mpls ip in the configuration. For Cisco IOS Software, the output of show mpls interface will show whether the device has it disabled. This example shows a Cisco IOS Software device that has MPLS forwarding disabled:
    Router#show mpls interface 
    IP MPLS forwarding is globally disabled on this router. 
    Individual interface configuration is as follows:
     
    Interface              IP            Tunnel   Operational
    Router#
    
    For Cisco IOS XE Software, examine the output of show running-config and confirm the existence of the global command no mpls, to ensure that the device will not process LDP hello messages. This example shows a Cisco IOS XE Software device that has MPLS forwarding disabled:
    Router#show running-config | include mpls 
    no mpls ip
    Router#
    Cisco IOS XR Software

    MPLS forwarding is disabled by default in Cisco IOS XR Software.

    A device that has MPLS forwarding enabled, will have the global configuration command mpls ldp in the configuration. This example shows a Cisco IOS XR Software device that has MPLS forwarding enabled:
    RP/0/0/CPU0:Router-XR#show running-config mpls
    mpls ldp
    !
     
    RP/0/0/CPU0:Router-XR#
    
    This example shows a Cisco IOS XR Software device with MPLS forwarding disabled:
    RP/0/0/CPU0:Router-XR#show running-config mpls
    % No such configuration item(s)
     
    RP/0/0/CPU0:Router-XR#
    
    If MPLS is disabled the device is not vulnerable and there is no requirement to perform the next step.
  2. Confirm whether the device is listening to LDP hello messages.
    If a device is configured to listen to LDP hello messages, it is vulnerable.

    Cisco IOS Software and Cisco IOS XE Software

    To determine if a device is configured to listen for LDP hello messages, log into the device and issue either of the following command line interface (CLI) commands show ip socket, show udp or show control-plane host open-ports. If the output shows any IP addresses listening on port UDP 646, the device is vulnerable. This is an example of a device that is configured to listen for LDP hello messages (one example is shown from each of the above commands):
    Router#show ip socket 
    Proto    Remote      Port      Local       Port  In Out Stat TTY OutputIF
     17   --listen--          192.168.0.1        67   0   0    1   0
     17   --listen--          192.168.0.1        68   0   0    1   0
     17   --listen--          192.168.0.1       711   0   0    1   0
     17   --listen--          192.168.0.1       646   0   0    1   0 
     17   --listen--          192.168.0.1      3503   0   0    1   0
    Router#
    Router#show udp 
    Proto    Remote      Port      Local       Port  In Out Stat TTY OutputIF
     17   --listen--          192.168.0.1       123   0   0    1   0
     17   --listen--          192.168.0.1       711   0   0    1   0
     17   --listen--          192.168.0.1       646   0   0    1   0 
     17   --listen--          192.168.0.1      3503   0   0    1   0
    Router#
    Router#show control-plane host open-ports 
    Active internet connections (servers and established)
    Prot        Local Address      Foreign Address                  Service    State
     tcp                 *:23                  *:0                   Telnet   LISTEN
     udp                *:123                  *:0                      NTP   LISTEN
     udp                *:646                  *:0                LDP Hello   LISTEN 
     udp                *:711                  *:0                TDP Hello   LISTEN
     
    Router#
    Cisco IOS XR Software

    To determine if a device is configured to listen for LDP hello messages, log in to the device and issue the show udp brief CLI command. If the output shows any IP address listening on port UDP 646, the device is vulnerable. This is an example of a device that is configured to listen for LDP hello messages:
    RP/0/0/CPU0:Router-XR#show udp brief 
    PCB        Recv-Q Send-Q  Local Address          Foreign Address
    0x482609e8      0      0  :::514                 :::0
    0x482605f0      0      0  0.0.0.0:514            0.0.0.0:0
    0x48260720      0      0  0.0.0.0:646            0.0.0.0:0 
    RP/0/0/CPU0:Router-XR#
    If the device is not listening on UDP port 646, it is not vulnerable. Devices that are configured to only use Resource Reservation Protocol (RSVP) or Border Gateway Protocol (BGP) to distribute labels or MPLS Static Labels are not vulnerable.

To determine the Cisco IOS Software release that is running on a Cisco product, administrators can log in to the device and issue the show version command to display the system banner. The system banner confirms that the device is running Cisco IOS Software by displaying text similar to "Cisco Internetwork Operating System Software" or "Cisco IOS Software." The image name displays in parentheses, followed by "Version" and the Cisco IOS Software release name. Other Cisco devices do not have the show version command or may provide different output.

This example identifies a Cisco product that is running Cisco IOS Software Release 12.3(26) with an installed image name of C2500-IS-L:

Router#show version 
 Cisco Internetwork Operating System Software
 IOS (tm) 2500 Software (C2500-IS-L), Version 12.3(26), RELEASE SOFTWARE (fc2)
 Technical Support: http://www.cisco.com/techsupport
 Copyright   ) 1986-2008 by cisco Systems, Inc.
 Compiled Mon 17-Mar-08 14:39 by dchih
 
 <output truncated>

This example shows a product that is running Cisco IOS Software release 12.4(20)T with an image name of C1841-ADVENTERPRISEK9-M:

Router#show version 
Cisco IOS Software, 1841 Software (C1841-ADVENTERPRISEK9-M), Version 12.4(20)T, RELEASE SOFTWARE (fc3)
Technical Support: http://www.cisco.com/techsupport
Copyright   ) 1986-2008 by Cisco Systems, Inc.
Compiled Thu 10-Jul-08 20:25 by prod_rel_team
 
<output truncated>

Additional information about Cisco IOS Software release naming conventions is available in "White Paper: Cisco IOS Reference Guide" at this link: http://www.cisco.com/web/about/security/intelligence/ios-ref.html.

Products Confirmed Not Vulnerable

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

Details

MPLS LDP enables peer label switch routers (LSRs) in an MPLS network to exchange label binding information for supporting hop-by-hop forwarding in an MPLS network.

A vulnerability exists in Cisco IOS Software, Cisco IOS XE Software, and Cisco IOS XR Software when processing a specially crafted LDP packet. For the device to be vulnerable, it has to be configured to process LDP hello messages, as explained within the Affected Products section of this advisory.

The crafted LDP packet, can be received as either a unicast or multicast UDP packet on port UDP 646 on any listening IP address of the device. Transit traffic will not trigger this vulnerability.

Note: Devices configured with TDP will also process the crafted LDP packet and are vulnerable.

For further information regarding MPLS and LDP please consult the "Multiprotocol Label Switching (MPLS) Introduction" home page available at this link:

http://www.cisco.com/en/US/products/ps6557/products_ios_technology_home.html

This vulnerability is documented in the Cisco Bug ID CSCsz45567 ( registered customers only) for Cisco IOS Software and Cisco IOS XE Software, and CSCsj25893 ( registered customers only) for Cisco IOS XR Software. This vulnerability has been assigned Common Vulnerabilities and Exposures (CVE) ID CVE-2010-0576.

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 .

CSCsz45567: Cisco IOS Software Multiprotocol Label Switching Packet Vulnerability

Calculate the environmental score of CSCsz45567

CVSS Base Score - 7.8

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Low

None

None

None

Complete

CVSS Temporal Score - 6.4

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed

CSCsj25893: Cisco IOS XR Software Multiprotocol Label Switching Packet Vulnerability

Calculate the environmental score of CSCsj25893

CVSS Base Score - 5

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Low

None

None

None

Partial

CVSS Temporal Score - 4.1

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed

Impact

Successful exploitation of this vulnerability on a device running a vulnerable version of Cisco IOS Software or Cisco IOS XE Software will cause the affected device to reload.

Exploitation on a router running a vulnerable version of Cisco IOS XR Software will result in a restart of the mpls_ldp process.

The issue could be repeatedly exploited to cause an extended DoS condition.

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 "First Fixed Release for all Advisories in 24 March 2010 Bundle Publication" column indicates the earliest possible releases which have fixes for all the published vulnerabilities in this Cisco IOS Security Advisory bundled publication. Cisco recommends upgrading to the latest available release where possible.

Major Release

Availability of Repaired Releases

Affected 12.0-Based Releases

First Fixed Release for this Advisory

First Fixed Release for all Advisories in 24 March 2010 Bundle Publication

12.0

Not Vulnerable

Not Vulnerable

12.0DA

Not Vulnerable

Not Vulnerable

12.0DB

Not Vulnerable

Not Vulnerable

12.0DC

Not Vulnerable

Not Vulnerable

12.0S

12.0(32)S15; Available on 25-MAR-10

12.0(33)S6

12.0(32)S15; Available on 25-MAR-10

12.0(33)S6

12.0SC

Not Vulnerable

Not Vulnerable

12.0SL

Vulnerable; first fixed in 12.0S

Releases up to and including 12.0(14)SL1 are not vulnerable.

Releases up to and including 12.0(14)SL1 are not vulnerable; First fixed in 12.0S

12.0SP

Not Vulnerable

Not Vulnerable

12.0ST

Releases up to and including 12.0(9)ST are not vulnerable.

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.

12.0SX

Vulnerable; first fixed in 12.0S

Vulnerable; first fixed in 12.0S

12.0SY

12.0(32)SY11

12.0(32)SY9b

12.0(32)SY11

12.0(32)SY9b

12.0SZ

Vulnerable; first fixed in 12.0S

Vulnerable; first fixed in 12.0S

12.0T

Not Vulnerable

Not Vulnerable

12.0W

Not Vulnerable

Not Vulnerable

12.0WC

Not Vulnerable

Not Vulnerable

12.0WT

Not Vulnerable

Not Vulnerable

12.0XA

Not Vulnerable

Not Vulnerable

12.0XB

Not Vulnerable

Not Vulnerable

12.0XC

Not Vulnerable

Not Vulnerable

12.0XD

Not Vulnerable

Not Vulnerable

12.0XE

Not Vulnerable

Not Vulnerable

12.0XF

Not Vulnerable

Not Vulnerable

12.0XG

Not Vulnerable

Not Vulnerable

12.0XH

Not Vulnerable

Not Vulnerable

12.0XI

Not Vulnerable

Not Vulnerable

12.0XJ

Not Vulnerable

Not Vulnerable

12.0XK

Not Vulnerable

Not Vulnerable

12.0XL

Not Vulnerable

Not Vulnerable

12.0XM

Not Vulnerable

Not Vulnerable

12.0XN

Not Vulnerable

Not Vulnerable

12.0XQ

Not Vulnerable

Not Vulnerable

12.0XR

Not Vulnerable

Not Vulnerable

12.0XS

Not Vulnerable

Not Vulnerable

12.0XT

Not Vulnerable

Not Vulnerable

12.0XV

Not Vulnerable

Not Vulnerable

Affected 12.1-Based Releases

First Fixed Release for this Advisory

First Fixed Release for all Advisories in 24 March 2010 Bundle Publication

12.1

Not Vulnerable

Not Vulnerable

12.1AA

Not Vulnerable

Not Vulnerable

12.1AX

Vulnerable; first fixed in 12.2SE

Releases up to and including 12.1(11)AX are not vulnerable.

Releases up to and including 12.1(11)AX are not vulnerable; first fixed in 12.2SE

12.1AY

Not Vulnerable

Not Vulnerable

12.1AZ

Not Vulnerable

Not Vulnerable

12.1CX

Not Vulnerable

Not Vulnerable

12.1DA

Not Vulnerable

Not Vulnerable

12.1DB

Not Vulnerable

Not Vulnerable

12.1DC

Not Vulnerable

Not Vulnerable

12.1E

Vulnerable; first fixed in 12.2SXF

Releases up to 12.1(8a)E are not vulnerable.

Releases up to and including 12.1(7a)E1a are not vulnerable; migrate to any release in 12.2SXF

12.1EA

12.1(22)EA14; Available on 27-JUL-10

Releases up to and including 12.1(6)EA2c are not vulnerable. Releases 12.1(8)EA1c and later are not vulnerable.

12.1EB

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.1EC

Vulnerable; first fixed in 12.2SCB

Releases up to and including 12.1(7)EC are not vulnerable.

Releases up to and including 12.1(7)EC are not vulnerable; migrate to 12.2SCB

12.1EO

Releases up to and including 12.1(19)EO6 are not vulnerable.

Releases up to and including 12.1(19)EO6 are not vulnerable.

12.1EU

Not Vulnerable

Not Vulnerable

12.1EV

Not Vulnerable

Not Vulnerable

12.1EW

Not Vulnerable

Not Vulnerable

12.1EX

Vulnerable; migrate to any release in 12.2

Releases up to and including 12.1(6)EX are not vulnerable.

Vulnerable; migrate to any release in 12.2

12.1EY

Releases up to and including 12.1(7a)EY3 are not vulnerable.

Releases up to and including 12.1(7a)EY3 are not vulnerable.

12.1EZ

Not Vulnerable

Not Vulnerable

12.1GA

Not Vulnerable

Not Vulnerable

12.1GB

Not Vulnerable

Not Vulnerable

12.1T

Not Vulnerable

Not Vulnerable

12.1XA

Not Vulnerable

Not Vulnerable

12.1XB

Not Vulnerable

Not Vulnerable

12.1XC

Not Vulnerable

Not Vulnerable

12.1XD

Not Vulnerable

Not Vulnerable

12.1XE

Not Vulnerable

Not Vulnerable

12.1XF

Not Vulnerable

Not Vulnerable

12.1XG

Not Vulnerable

Not Vulnerable

12.1XH

Not Vulnerable

Not Vulnerable

12.1XI

Not Vulnerable

Not Vulnerable

12.1XJ

Not Vulnerable

Not Vulnerable

12.1XL

Not Vulnerable

Not Vulnerable

12.1XM

Not Vulnerable

Not Vulnerable

12.1XP

Not Vulnerable

Not Vulnerable

12.1XQ

Not Vulnerable

Not Vulnerable

12.1XR

Not Vulnerable

Not Vulnerable

12.1XS

Not Vulnerable

Not Vulnerable

12.1XT

Not Vulnerable

Not Vulnerable

12.1XU

Not Vulnerable

Vulnerable; migrate to any release in 12.2

12.1XV

Note: Releases prior to 12.1(5)XV1 are vulnerable, release 12.1(5)XV1 and later are not vulnerable;

Releases prior to 12.1(5)XV1 are vulnerable, release 12.1(5)XV1 and later are not vulnerable

12.1XW

Not Vulnerable

Not Vulnerable

12.1XX

Not Vulnerable

Not Vulnerable

12.1XY

Not Vulnerable

Not Vulnerable

12.1XZ

Not Vulnerable

Not Vulnerable

12.1YA

Not Vulnerable

Not Vulnerable

12.1YB

Vulnerable; migrate to any release in 12.2

Vulnerable; migrate to any release in 12.2

12.1YC

Not Vulnerable

Not Vulnerable

12.1YD

Vulnerable; migrate to any release in 12.2

Vulnerable; migrate to any release in 12.2

12.1YE

Releases prior to 12.1(5)YE1 are vulnerable, release 12.1(5)YE1 and later are not vulnerable;

Releases prior to 12.1(5)YE6 are vulnerable, release 12.1(5)YE6 and later are not vulnerable.

12.1YF

Not Vulnerable

Not Vulnerable

12.1YH

Not Vulnerable

Not Vulnerable

12.1YI

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.1YJ

Not Vulnerable

Not Vulnerable

Affected 12.2-Based Releases

First Fixed Release for this Advisory

First Fixed Release for all Advisories in 24 March 2010 Bundle Publication

12.2

Not Vulnerable

Not Vulnerable

12.2B

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2BC

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2BW

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2BX

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2BY

Releases prior to 12.2(8)BY are vulnerable, release 12.2(8)BY and later are not vulnerable; first fixed in 12.4

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2BZ

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2CX

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2CY

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2CZ

Not Vulnerable

Vulnerable; migrate to any release in 12.2SRE

12.2DA

Not Vulnerable

Not Vulnerable

12.2DD

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2DX

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2EW

Not Vulnerable

Not Vulnerable

12.2EWA

Not Vulnerable

Not Vulnerable

12.2EX

Releases up to and including 12.2(37)EX are not vulnerable.

Releases 12.2(44)EX and later are not vulnerable; first fixed in 12.2SE

Releases up to and including 12.2(37)EX are not vulnerable.

Releases 12.2(44)EX and later are not vulnerable; first fixed in 12.2SE

12.2EY

Releases prior to 12.2(37)EY are vulnerable, release 12.2(37)EY and later are not vulnerable; first fixed in 12.2SE

Releases prior to 12.2(37)EY are vulnerable, release 12.2(37)EY and later are not vulnerable

12.2EZ

Not Vulnerable

Not Vulnerable

12.2FX

Not Vulnerable

Not Vulnerable

12.2FY

Not Vulnerable

Not Vulnerable

12.2FZ

Not Vulnerable

Not Vulnerable

12.2IRA

Vulnerable; first fixed in 12.2SRC

Vulnerable; first fixed in 12.2SRC

12.2IRB

Vulnerable; first fixed in 12.2SRC

Vulnerable; first fixed in 12.2SRC

12.2IRC

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2IRD

Vulnerable; 12.2(33)IRE, available on 15-April-10

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2IXA

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2IXB

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2IXC

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2IXD

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2IXE

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2IXF

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2IXG

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2IXH

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2JA

Not Vulnerable

Releases up to and including 12.2(4)JA1 are not vulnerable.

12.2JK

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2MB

Not Vulnerable

Not Vulnerable

12.2MC

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; first fixed in 12.4

12.2MRA

Not Vulnerable

Not Vulnerable

12.2S

Releases prior to 12.2(30)S are vulnerable, release 12.2(30)S and later are not vulnerable; first fixed in 12.2SB

Releases prior to 12.2(30)S are vulnerable, release 12.2(30)S and later are not vulnerable;

12.2SB

12.2(31)SB18; Available on 24-MAR-10

12.2(33)SB8

12.2(33)SB8

12.2(31)SB18; Available on 24-MAR-10

12.2SBC

Vulnerable; first fixed in 12.2SB

Vulnerable; migrate to any release in 12.2SRE

12.2SCA

Vulnerable; first fixed in 12.2SCB

Vulnerable; first fixed in 12.2SCB

12.2SCB

12.2(33)SCB6

12.2(33)SCB6

12.2SCC

12.2(33)SCC1

12.2(33)SCC1

12.2SCD

Not Vulnerable

Not Vulnerable

12.2SE

12.2(50)SE4; Available on 25-MAR-10

12.2(50)SE4; Available on 25-MAR-10

12.2SEA

Not Vulnerable

Not Vulnerable

12.2SEB

Not Vulnerable

Not Vulnerable

12.2SEC

Not Vulnerable

Not Vulnerable

12.2SED

Vulnerable; first fixed in 12.2SE

Vulnerable; first fixed in 12.2SE

12.2SEE

Vulnerable; first fixed in 12.2SE

Vulnerable; first fixed in 12.2SE

12.2SEF

Not Vulnerable

Not Vulnerable

12.2SEG

Releases prior to 12.2(25)SEG4 are vulnerable, release 12.2(25)SEG4 and later are not vulnerable; first fixed in 12.2SE

Releases prior to 12.2(25)SEG4 are vulnerable, release 12.2(25)SEG4 and later are not vulnerable; first fixed in 12.2SE

12.2SG

Releases up to and including 12.2(31)SG1 are not vulnerable;

Release 12.2(40)SG and later are not vulnerable;

Releases up to 12.2(31)SG1 are not vulnerable; releases 12.2(40)SG and later are not vulnerable.

12.2SGA

Not Vulnerable

Not Vulnerable

12.2SL

Not Vulnerable

Not Vulnerable

12.2SM

Not Vulnerable

Not Vulnerable

12.2SO

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2SQ

Not Vulnerable

Not Vulnerable

12.2SRA

Vulnerable; first fixed in 12.2SRD

Vulnerable; first fixed in 12.2SRD

12.2SRB

Vulnerable; first fixed in 12.2SRD

Vulnerable; first fixed in 12.2SRD

12.2SRC

12.2(33)SRC5

12.2(33)SRC5

12.2SRD

12.2(33)SRD3

12.2(33)SRD3

12.2SRE

Not Vulnerable

Not Vulnerable

12.2STE

Not Vulnerable

Not Vulnerable

12.2SU

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2SV

p>Releases up to and including 12.2(18)SV2 are not vulnerable.

Releases up to and including 12.2(18)SV2 are not vulnerable.

12.2SVA

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2SVC

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2SVD

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2SVE

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2SW

Releases prior to 12.2(25)SW12 are vulnerable, release 12.2(25)SW12 and later are not vulnerable; migrate to any release in 12.4SW

Releases up to and including 12.2(25)SW3 are not vulnerable.

Releases 12.2(25)SW12 and later are not vulnerable; first fixed in 15.0M

12.2SX

Vulnerable; first fixed in 12.2SXF

Vulnerable; first fixed in 12.2SXF

12.2SXA

Vulnerable; first fixed in 12.2SXF

Vulnerable; first fixed in 12.2SXF

12.2SXB

Vulnerable; first fixed in 12.2SXF

Vulnerable; first fixed in 12.2SXF

12.2SXD

Vulnerable; first fixed in 12.2SXF

Vulnerable; first fixed in 12.2SXF

12.2SXE

Vulnerable; first fixed in 12.2SXF

Vulnerable; first fixed in 12.2SXF

12.2SXF

12.2(18)SXF17a

12.2(18)SXF17a

12.2SXH

12.2(33)SXH6

12.2(33)SXH6

12.2SXI

12.2(33)SXI2

12.2(33)SXI2a

12.2(33)SXI2a

12.2(33)SXI3

12.2SY

Vulnerable; first fixed in 12.2SB

Vulnerable; migrate to any release in 12.2SRE

12.2SZ

Vulnerable; first fixed in 12.2SB

Vulnerable; migrate to any release in 12.2SRE

12.2T

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2TPC

Releases up to and including 12.2(8)TPC10a are not vulnerable.

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2XA

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Releases up to and including 12.2(1)XA are not vulnerable.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2XB

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2XC

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2XD

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2XE

Not Vulnerable

Not Vulnerable

12.2XF

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2XG

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2XH

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2XI

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2XJ

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2XK

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2XL

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2XM

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2XN

Releases prior to 12.2(33)XN1 are vulnerable, release 12.2(33)XN1 and later are not vulnerable; first fixed in 12.2SRC

Releases prior to 12.2(33)XN1 are vulnerable, release 12.2(33)XN1 and later are not vulnerable; first fixed in 12.2SRC

12.2XNA

Please see Cisco IOS-XE Software Availability

Please see Cisco IOS-XE Software Availability

12.2XNB

Please see Cisco IOS-XE Software Availability

Please see Cisco IOS-XE Software Availability

12.2XNC

Please see Cisco IOS-XE Software Availability

Please see Cisco IOS-XE Software Availability

12.2XND

Please see Cisco IOS-XE Software Availability

Please see Cisco IOS-XE Software Availability

12.2XNE

Please see Cisco IOS-XE Software Availability

Please see Cisco IOS-XE Software Availability

12.2XNF

Please see Cisco IOS-XE Software Availability

Please see Cisco IOS-XE Software Availability

12.2XO

Not Vulnerable

Not Vulnerable

12.2XQ

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2XR

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2XS

Not Vulnerable

Not Vulnerable

12.2XT

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2XU

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2XV

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2XW

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2YA

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2YB

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2YC

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2YD

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2YE

Not Vulnerable

Not Vulnerable

12.2YF

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2YG

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2YH

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2YJ

Releases prior to 12.2(8)YJ1 are vulnerable, release 12.2(8)YJ1 and later are not vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2YK

Not Vulnerable

Not Vulnerable

12.2YL

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2YM

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2YN

Releases prior to 12.2(8)YN1 are vulnerable, release 12.2(8)YN1 and later are not vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2YO

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2YP

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Releases up to and including 12.2(8)YP are not vulnerable.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2YQ

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2YR

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2YS

Not Vulnerable

Not Vulnerable

12.2YT

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2YU

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2YV

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2YW

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2YX

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2YY

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2YZ

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2ZA

Vulnerable; first fixed in 12.2SXF

Vulnerable; first fixed in 12.2SXF

12.2ZB

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2ZC

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2ZD

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2ZE

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2ZF

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2ZG

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2ZH

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.2ZJ

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2ZL

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2ZP

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2ZU

Vulnerable; first fixed in 12.2SXH

Vulnerable; first fixed in 12.2SXH

12.2ZX

Vulnerable; first fixed in 12.2SB

Vulnerable; migrate to any release in 12.2SRE

12.2ZY

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.2ZYA

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Affected 12.3-Based Releases

First Fixed Release for this Advisory

First Fixed Release for all Advisories in 24 March 2010 Bundle Publication

12.3

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3B

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3BC

Vulnerable; first fixed in 12.2SCB

Vulnerable; first fixed in 12.2SCB

12.3BW

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3EU

Not Vulnerable

Not Vulnerable

12.3JA

Not Vulnerable

Releases prior to 12.3(11)JA5 are vulnerable, release 12.3(11)JA5 and later are not vulnerable

12.3JEA

Not Vulnerable

Releases prior to 12.3(8)JEA4 are vulnerable, release 12.3(8)JEA4 and later are not vulnerable

12.3JEB

Not Vulnerable

Releases prior to 12.3(8)JEB2 are vulnerable, release 12.3(8)JEB2 and later are not vulnerable

12.3JEC

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.3JED

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.3JK

Releases up to and including 12.3(2)JK3 are not vulnerable.

Releases 12.3(8)JK1 and later are not vulnerable; first fixed in 12.4

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3JL

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.3JX

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.3T

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3TPC

Releases up to and including 12.3(4)TPC11a are not vulnerable.

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.3VA

Not Vulnerable

Not Vulnerable

12.3XA

Releases up to and including 12.3(2)XA3 are not vulnerable.

Releases 12.3(2)XA7 and later are not vulnerable; first fixed in 12.4

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3XB

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.3XC

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release. Releases up to and including 12.3(2)XC4 are not vulnerable.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3XD

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3XE

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release. Releases up to and including 12.3(2)XE4 are not vulnerable.

Vulnerable; first fixed in 12.4

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3XF

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.3XG

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3XI

Releases prior to 12.3(7)XI11 are vulnerable, release 12.3(7)XI11 and later are not vulnerable; first fixed in 12.2SB

Releases prior to 12.3(7)XI11 are vulnerable, release 12.3(7)XI11 and later are not vulnerable

12.3XJ

Releases prior to 12.3(7)XJ2 are vulnerable, release 12.3(7)XJ2 and later are not vulnerable; migrate to any release in 12.4XN

Vulnerable; first fixed in 12.4XR

12.3XK

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3XL

Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3XQ

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3XR

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release. Releases up to and including 12.3(7)XR6 are not vulnerable.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3XS

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3XU

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3XW

Vulnerable; migrate to any release in 12.4XN

Vulnerable; first fixed in 12.4XR

12.3XX

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release. Releases up to and including 12.3(8)XX1 are not vulnerable.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3XY

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3XZ

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3YA

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3YD

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3YF

Releases prior to 12.3(11)YF1 are vulnerable, release 12.3(11)YF1 and later are not vulnerable;

Vulnerable; first fixed in 12.4XR

12.3YG

Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release. Releases up to and including 12.3(8)YG5 are not vulnerable.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3YH

Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3YI

Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3YJ

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3YK

Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release. Releases prior to 12.3(11)YK1 are vulnerable, release 12.3(11)YK1 and later are not vulnerable;

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3YM

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3YQ

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3YS

Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release. Releases up to and including 12.3(11)YS1 are not vulnerable.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3YT

Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3YU

Vulnerable; migrate to any release in 12.4XB

Releases up to and including 12.3(14)YU are not vulnerable.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.3YX

Releases prior to 12.3(14)YX10 are vulnerable, release 12.3(14)YX10 and later are not vulnerable; migrate to any release in 12.4XN

Vulnerable; first fixed in 12.4XR

12.3YZ

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.3ZA

Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

Affected 12.4-Based Releases

First Fixed Release for this Advisory

First Fixed Release for all Advisories in 24 March 2010 Bundle Publication

12.4

12.4(25c)

12.4(25c)

15.0(1)M1

12.4GC

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.4JA

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.4JDA

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.4JDC

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.4JDD

Not Vulnerable

12.4(10b)JDD1

12.4JHA

Not Vulnerable

Not Vulnerable

12.4JK

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.4JL

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.4JMA

Not Vulnerable

Releases prior to 12.4(3g)JMA2 are vulnerable, release 12.4(3g)JMA2 and later are not vulnerable

12.4JMB

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.4JX

Not Vulnerable

Vulnerable; first fixed in 12.4JA

12.4MD

Not Vulnerable

12.4(24)MD

12.4MDA

Not Vulnerable

12.4(22)MDA2

12.4MR

12.4(20)MR2

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.4SW

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.4T

12.4(15)T10, 12.4(20)T4, 12.4(22)T3, 12.4(24)T2

12.4(15)T12

12.4(20)T5

12.4(24)T3; Available on 26-MAR-10

12.4(22)T4

12.4XA

Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.4XB

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.4XC

Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.4XD

Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.4XE

Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.4XF

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.4XG

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.4XJ

Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.4XK

Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.4XL

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.4XM

Not Vulnerable

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.4XN

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.4XP

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.4XQ

Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.4XR

12.4(22)XR3

12.4(22)XR3

12.4XT

Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.4XV

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.4XW

Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.4XY

Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.4XZ

Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.4YA

Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release.

Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.

12.4YB

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.4YD

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

12.4YE

12.4(22)YE2

12.4(22)YE2

12.4(24)YE

12.4YG

Not Vulnerable

Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory

Affected 15.0-Based Releases

First Fixed Release for this Advisory

First Fixed Release for all Advisories in 24 March 2010 Bundle Publication

There are no affected 15.0 based releases

Affected 15.1-Based Releases

First Fixed Release for this Advisory

First Fixed Release for all Advisories in 24 March 2010 Bundle Publication

There are no affected 15.1 based releases

Cisco IOS XE Software

Cisco IOS XE Software Release

First Fixed Release

2.1.x

Vulnerable, Migrate to 2.3.2 or later

2.2.x

Vulnerable, Migrate to 2.3.2 or later

2.3.x

2.3.2

2.4.x

Not Vulnerable

2.5.x

Not Vulnerable

2.6.x

Not Vulnerable

Cisco IOS XR Software

This vulnerability can be addressed by applying the appropriate Software Maintenance Upgrade (SMU), per the table below. Installation of the appropriate SMU does not require a system reload. Refer to the document "Guidelines for Cisco IOS XR Software" at the following link for additional information on Cisco IOS XR Software and SMUs: http://www.cisco.com/en/US/prod/collateral/iosswrel/ps8803/ps5845/product_bulletin_c25-478699.htm

Cisco IOS XR Software Version

SMU ID

SMU Name

3.2.X

Vulnerable; Migrate to 3.5.2 or later.

3.3.X

Vulnerable; Migrate to 3.5.2 or later.

3.4.0

Vulnerable; Migrate to 3.5.2 or later.

3.4.1

AA03710

AA03707

c12k-mpls-3.4.1.CSCsj25893

hfr-mpls-3.4.1.CSCsj25893

3.4.2

AA03711

AA03708

c12k-mpls-3.4.2.CSCsj25893

hfr-mpls-3.4.2.CSCsj25893

3.4.3

AA03712

AA03709

c12k-mpls-3.4.3.CSCsj25893

hfr-mpls-3.4.3.CSCsj25893

3.5.2

Not Vulnerable

3.5.3

Not Vulnerable

3.5.4

Not Vulnerable

3.6.X

Not Vulnerable

3.7.X

Not Vulnerable

3.8.X

Not Vulnerable

3.9.X

Not Vulnerable

Workarounds

Users are advised to apply mitigation techniques to help limit exposure to the vulnerability. Mitigation consists of allowing only legitimate devices to connect to the device. To increase effectiveness, the mitigation must be coupled with anti-spoofing measures on the network edge. This action is required because LDP will use UDP as the hello transport protocol.

If LDP is not required on the device, then MPLS forwarding can be disabled with the global configuration command no mpls ip.

Note:  LDP password or MD5 protection, does not protect against this vulnerability.

Transit traffic will not exploit this vulnerability. Only packets destined to the device may be used to exploit this vulnerability.

Additional mitigations that can be deployed on Cisco devices within the network are available in the companion document "Cisco Applied Mitigation Bulletin: Identifying and Mitigating Exploitation of the Cisco IOS Software Multiprotocol Label Switching Packet Vulnerability," which is available at this location: http://tools.cisco.com/security/center/content/CiscoAppliedMitigationBulletin/cisco-amb-20100324-ldp.

Infrastructure Access Control Lists

warning Warning:  Because the feature in this vulnerability utilizes UDP as a transport, it is possible to spoof the sender's IP address, which may defeat access control lists (ACLs) that permit communication to these ports from trusted IP addresses. Unicast Reverse Path Forwarding (Unicast RPF) should also be considered, to offer a comprehensive solution.

Although it is often difficult to block traffic that transits a network, it is possible to identify traffic that should never be allowed to target infrastructure devices and block that traffic at the border of the network. Infrastructure ACLs (iACLs) are a network security best practice and should be considered as a long-term addition to good network security as well as a workaround for this specific vulnerability. This iACL example should be included as part of the deployed infrastructure access list, which will help protect all devices with IP addresses in the infrastructure IP address range:

 
 
!---
!--- Feature: Label Distribution Protocol (LDP)
!--- 
 
 
access-list 150 permit udp TRUSTED_SOURCE_ADDRESSES 
    WILDCARD INFRASTRUCTURE_ADDRESSES WILDCARD eq 646
 
 
access-list 150 permit udp TRUSTED_SOURCE_ADDRESSES 
    WILDCARD host 224.0.0.2 eq 646
 
 
!---
!--- Deny LDP traffic from all other sources destined
!--- to infrastructure addresses, including multicast
!--- and broadcast addresses.
!--- 
 
 
access-list 150 deny udp any 224.0.0.0 0.0.0.255 eq 646
access-list 150 deny udp any host 255.255.255.255 eq 646
access-list 150 deny udp any  
    INFRASTRUCTURE_ADDRESSES WILDCARD eq 646
 
 
!---
!--- Permit/deny all other Layer 3 and Layer 4 traffic in
!--- accordance with existing security policies and
!--- configurations.  Permit all other traffic to transit the
!--- device.
!--- 
 
 
access-list 150 permit ip any any
 
 
!---
!--- Apply access-list to all interfaces (only one example
!--- shown)
!--- 
 
 
interface fastEthernet 2/0
 ip access-group 150 in

The white paper entitled "Protecting Your Core: Infrastructure Protection Access Control Lists" presents guidelines and recommended deployment techniques for infrastructure protection access lists and is available at this link: http://www.cisco.com/en/US/tech/tk648/tk361/technologies_white_paper09186a00801a1a55.shtml

Control Plane Policing

warning Warning: Because the feature in this vulnerability utilizes UDP as a transport, it is possible to spoof the sender's IP address, which may defeat ACLs that permit communication to these ports from trusted IP addresses. Unicast RPF should also be considered, to offer a comprehensive solution.

Control Plane Policing (CoPP) can be used to block untrusted UDP traffic to the device. Cisco IOS Software Releases 12.0S, 12.2SX, 12.2S, 12.3T, 12.4, and 12.4T support the CoPP feature. CoPP can be configured on a device to help protect the management and control planes and minimize the risk and effectiveness of direct infrastructure attacks by explicitly permitting only authorized traffic that is sent to infrastructure devices in accordance with existing security policies and configurations. The CoPP example below should be included as part of the deployed CoPP policy, which will help protect all devices with IP addresses in the infrastructure IP address range.

 
 
!---
!--- Feature: Label Distribution Protocol (LDP)
!--- 
 
 
access-list 150 deny udp TRUSTED_SOURCE_ADDRESSES 
     WILDCARD any eq 646
 
 
!---
!--- Deny LDP traffic from all other sources destined
!--- to the device control plane.
!--- 
 
 
access-list 150 permit udp any any eq 646
 
 
!---
!--- Permit (Police or Drop)/Deny (Allow) all other Layer3 and 
!--- Layer4 traffic in accordance with existing security policies
!--- and configurations for traffic that is authorized to be sent
!--- to infrastructure devices
!--- Create a Class-Map for traffic to be policed by
!--- the CoPP feature
!--- 
 
 
class-map match-all drop-ldp-class
 match access-group 150
 
 
!---
!--- Create a Policy-Map that will be applied to the
!--- Control-Plane of the device.
!--- 
 
 
policy-map control-plane-policy
 class drop-ldp-class
  drop
 
 
!---
!--- Apply the Policy-Map to the 
!--- Control-Plane of the device
!--- 
 
 
 
control-plane
 service-policy input control-plane-policy

In the above CoPP example, the access control entries (ACEs) that match the potential exploit packets with the "permit" action result in these packets being discarded by the policy-map "drop" function, while packets that match the "deny" action (not shown) are not affected by the policy-map drop function. Please note that the policy-map syntax is different in the 12.2S and 12.0S Cisco IOS Software trains:

policy-map control-plane-policy
class drop-udp-class
police 32000 1500 1500 conform-action drop exceed-action drop

Additional information on the configuration and use of the CoPP feature can be found in the documents, "Control Plane Policing Implementation Best Practices" and "Cisco IOS Software Releases 12.2 S - Control Plane Policing" at these links: http://www.cisco.com/web/about/security/intelligence/coppwp_gs.html and http://www.cisco.com/en/US/docs/ios/12_3t/12_3t4/feature/guide/gtrtlimt.html

Receive ACLs (rACL)

warning Warning: Because the feature in this vulnerability utilizes UDP as a transport, it is possible to spoof the sender's IP address, which may defeat ACLs that permit communication to these ports from trusted IP addresses. Unicast RPF should also be considered, to offer a comprehensive solution.

For distributed platforms, Receive ACLs may be an option starting in Cisco IOS Software Versions 12.0(21)S2 for the 12000 (GSR), 12.0(24)S for the 7500, and 12.0(31)S for the 10720. The Receive ACL protects the device from harmful traffic before the traffic can impact the route processor. Receive ACLs are designed to only protect the device on which it is configured. On the 12000, 7500, and 10720, transit traffic is never affected by a receive ACL. Because of this, the destination IP address "any" used in the example ACL entries below only refer to the router's own physical or virtual IP addresses. Receive ACLs are considered a network security best practice, and should be considered as a long-term addition to good network security, as well as a workaround for this specific vulnerability. The white paper entitled "GSR: Receive Access Control Lists" will help you identify and allow legitimate traffic to your device and deny all unwanted packets. This white paper is available at the following link http://www.cisco.com/en/US/tech/tk648/tk361/technologies_white_paper09186a00801a0a5e.shtml

This is the receive path ACL written to permit this type of traffic from trusted hosts:

 
 
!---
!--- Feature: Label Distribution Protocol (LDP)
!--- 
 
 
 
!---
!--- Permit LDP traffic from all trusted sources allowed
!--- to infrastructure addresses.
!--- 
 
 
access-list 150 permit udp TRUSTED_SOURCE_ADDRESSES WILDCARD
     any eq 646
 
 
!---
!--- Deny LDP traffic from all other sources destined
!--- to infrastructure addresses.
!--- 
 
 
access-list 150 deny udp any any eq 646
 
 
!---
!--- Permit all other traffic to the RP.
!--- according to security policy and configurations.
!---
 
 
access-list 150 permit ip any any
 
 
!---
!--- Apply this access list to the 'receive' path.
!--- 
 
 
ip receive access-list 150
 

Obtaining Fixed Software

Cisco has released free software updates that address these vulnerabilities. Prior to deploying software, customers should consult their maintenance provider or check the software for feature set compatibility and known issues specific to their environment.

Customers may only install and expect support for the feature sets they have purchased. By installing, downloading, accessing or otherwise using such software upgrades, customers agree to be bound by the terms of Cisco's software license terms found at http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html , or as otherwise set forth at Cisco.com Downloads at http://www.cisco.com/public/sw-center/sw-usingswc.shtml .

Do not contact psirt@cisco.com or security-alert@cisco.com for software upgrades

Customers with Service Contracts

Customers with contracts should obtain upgraded software through their regular update channels. For most customers, this means that upgrades should be obtained through the Software Center on Cisco's worldwide website at http://www.cisco.com.

Customers using Third Party Support Organizations

Customers whose Cisco products are provided or maintained through prior or existing agreements with third-party support organizations, such as Cisco Partners, authorized resellers, or service providers should contact that support organization for guidance and assistance with the appropriate course of action in regards to this advisory.

The effectiveness of any workaround or fix is dependent on specific customer situations, such as product mix, network topology, traffic behavior, and organizational mission. Due to the variety of affected products and releases, customers should consult with their service provider or support organization to ensure any applied workaround or fix is the most appropriate for use in the intended network before it is deployed.

Customers without Service Contracts

Customers who purchase direct from Cisco but do not hold a Cisco service contract, and customers who purchase through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should acquire upgrades by contacting the Cisco Technical Assistance Center (TAC). TAC contacts are as follows.

Customers should have their product serial number available and be prepared to give the URL of this notice as evidence of entitlement to a free upgrade. Free upgrades for non-contract customers must be requested through the TAC.

Refer to http://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html for additional TAC contact information, including localized telephone numbers, and instructions and e-mail addresses for use in various languages.

Exploitation and Public Announcements

The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability described in this advisory.

This vulnerability was discovered during internal testing.

Status of this Notice: Final

THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.

A stand-alone copy or Paraphrase of the text of this document that omits the distribution URL in the following section is an uncontrolled copy, and may lack important information or contain factual errors.


Distribution

This advisory is posted on Cisco's worldwide website at:

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20100324-ldp

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 1.1

2010-March-26

Update made to iACL example.

Revision 1.0

2010-March-24

Initial public release.

Cisco Security Procedures

Complete information on reporting security vulnerabilities in Cisco products, obtaining assistance with security incidents, and registering to receive security information from Cisco, is available on Cisco's worldwide website at http://www.cisco.com/web/about/security/psirt/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.