Cisco Security Advisory

Cisco IOS Software Internet Group Management Protocol Denial of Service Vulnerability

Advisory ID: cisco-sa-20100922-igmp

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20100922-igmp

Revision 1.1

Last Updated  2012 September 21 19:13  UTC (GMT)

For Public Release 2010 September 22 16:00  UTC (GMT)


Summary

A vulnerability in the Internet Group Management Protocol (IGMP) version 3 implementation of Cisco IOS® Software and Cisco IOS XE Software allows a remote unauthenticated attacker to cause a reload of an affected device. Repeated attempts to exploit this vulnerability could result in a sustained denial of service (DoS) condition. Cisco has released free software updates that address this vulnerability.

This advisory is posted at http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20100922-igmp.

Note: The September 22, 2010, Cisco IOS Software Security Advisory bundled publication includes six Cisco Security Advisories. Five of the advisories address vulnerabilities in Cisco IOS Software, and one advisory addresses vulnerabilities in Cisco Unified Communications Manager. Each advisory lists the releases that correct the vulnerability or vulnerabilities detailed in the advisory. The table at the following URL lists releases that correct all Cisco IOS Software vulnerabilities that have been published on September 22, 2010, or earlier:

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20100922-bundle

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

http://www.cisco.com/web/about/security/intelligence/Cisco_ERP_sep10.html

Affected Products

Vulnerable Products

The following products are affected by this vulnerability:

  • Cisco IOS Software
  • Cisco IOS XE Software
    To determine the Cisco IOS Software release that is running on a Cisco product, administrators can log in to the device and issue the show version command to display the system banner. The system banner confirms that the device is running Cisco IOS Software by displaying text similar to "Cisco Internetwork Operating System Software" or "Cisco IOS Software." The image name displays in parentheses, followed by "Version" and the Cisco IOS Software release name. Other Cisco devices do not have the show version command or may provide different output.
    The following example identifies a Cisco product that is running Cisco IOS Software Release 12.4(20)T with an installed 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 (c) 1986-2008 by Cisco Systems, Inc.
    Compiled Thu 10-Jul-08 20:25 by prod_rel_team
    Additional information about Cisco IOS Software release naming conventions is available in White Paper: Cisco IOS and NX-OS Software Reference Guide.

Products Confirmed Not Vulnerable

No other Cisco products are currently known to be affected by this vulnerability. Cisco IOS XR Software is not affected by this vulnerability.

The IGMP version 1, IGMP version 2, and IPv6 Multicast Listener Discovery protocol (MLD) features in Cisco IOS and Cisco IOS XE Software are not affected by this vulnerability.

Details

Internet Group Management Protocol (IGMP) is the protocol used by hosts and adjacent routers to manage membership in IP multicast groups. The IGMP version 3 protocol permits source-specific multicast which allows hosts to specify the IP address of the multicast source.

A malformed IGMP packet can cause a vulnerable device to reload. This vulnerability can only be exploited if the malformed IGMP packet is received on an interface that has been enabled for IGMP version 3 and Protocol Independent Multicast (PIM). The malformed IGMP packet destination address can be unicast, multicast, or broadcast and can be addressed to any IP address in the vulnerable device, including loopback addresses.

To exploit this vulnerability, a malformed packet must be received on a vulnerable interface, but it can be addressed to any IP address on the vulnerable device.

Transit traffic will not trigger this vulnerability.

A vulnerable interface configuration requires the PIM mode of operation (sparse-dense, sparse, or dense) to be configured in addition to the ip igmp version 3 command. The three possible configurations that permit exploitation of this vulnerability are:


!--- Interface configured for PIM sparse and IGMPv3


interface GigabitEthernet0/0
 ip address 192.168.0.1 255.255.255.0
 ip pim sparse-mode
 ip igmp version 3


!--- Interface configured for PIM sparse-dense and IGMPv3


interface GigabitEthernet0/1
 ip address 192.168.1.1 255.255.255.0
 ip pim sparse-dense-mode
 ip igmp version 3


!--- Interface configured for PIM dense and IGMPv3


interface GigabitEthernet0/2
 ip address 192.168.2.1 255.255.255.0
 ip pim dense-mode
 ip igmp version 3

The IGMP version 3 lite feature is unrelated to this vulnerability, in that the presence or absence of the ip igmp v3lite command on an interface does not change the vulnerable condition of that interface.

The IP router alert option may or may not be present in packets attempting to exploit the vulnerability described in this document.

This vulnerability is documented in Cisco bug ID CSCte14603 ( registered customers only) . This vulnerability has been assigned Common Vulnerabilities and Exposures (CVE) ID CVE-2010-2830.

Vulnerability Scoring Details

Cisco has provided scores for the vulnerability in this advisory based on the Common Vulnerability Scoring System (CVSS). The CVSS scoring in this Security Advisory is done in accordance with CVSS version 2.0.

CVSS is a standards-based scoring method that conveys vulnerability severity and helps determine urgency and priority of response.

Cisco has provided a base and temporal score. Customers can then compute environmental scores to assist in determining the impact of the vulnerability in individual networks.

Cisco has provided an FAQ to answer additional questions regarding CVSS at

http://www.cisco.com/web/about/security/intelligence/cvss-qandas.html.

Cisco has also provided a CVSS calculator to help compute the environmental impact for individual networks at

http://intellishield.cisco.com/security/alertmanager/cvss.

CSCte14603 ( registered customers only) IGMPv3 DoS Vulnerability

Calculate the environmental score of CSCte14603

CVSS Base Score - 7.1

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Medium

None

None

None

Complete

CVSS Temporal Score - 5.9

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed

Impact

Successful exploitation of this vulnerability may cause the affected device vulnerable device to reload. Repeated exploitation may result in a sustained 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 following Cisco IOS Software table corresponds to a Cisco IOS Software train. If a particular train is vulnerable, the earliest releases that contain the fix are listed in the First Fixed Release For This Advisory column. The First Fixed Release for All Advisories in the September 2010 Bundle Publication column lists the earliest possible releases that correct all the published vulnerabilities in the Cisco IOS Software Security Advisory bundled publication. Cisco recommends upgrading to the latest available release, where possible.

Major Release

Availability of Repaired Releases

Affected 12.0-Based Releases

First Fixed Release for This Advisory

First Fixed Release for All Advisories in the September 2010 Bundle Publication

There are no affected 12.0 based releases

Affected 12.1-Based Releases

First Fixed Release for This Advisory

First Fixed Release for All Advisories in the September 2010 Bundle Publication

There are no affected 12.1 based releases

Affected 12.2-Based Releases

First Fixed Release for This Advisory

First Fixed Release for All Advisories in the September 2010 Bundle Publication

12.2

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.2B

Not Vulnerable

Vulnerable; first fixed in 12.4T

Releases up to and including 12.2(2)B7 are not vulnerable.

12.2BC

Not Vulnerable

Not Vulnerable

12.2BW

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.2BX

Not Vulnerable

Vulnerable; first fixed in 12.2SB

Releases up to and including 12.2(15)BX are not vulnerable.

12.2BY

Not Vulnerable

Vulnerable; first fixed in 12.4T

Releases up to and including 12.2(2)BY3 are not vulnerable.

12.2BZ

Not Vulnerable

Not Vulnerable

12.2CX

Not Vulnerable

Not Vulnerable

12.2CY

Not Vulnerable

Not Vulnerable

12.2CZ

Not Vulnerable

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

12.2DA

Not Vulnerable

Not Vulnerable

12.2DD

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.2DX

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.2EW

Not Vulnerable

Not Vulnerable

12.2EWA

Not Vulnerable

Not Vulnerable

12.2EX

Not Vulnerable

Not Vulnerable

12.2EY

Not Vulnerable

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

Not Vulnerable

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

12.2IRB

Not Vulnerable

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

12.2IRC

Not Vulnerable

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

12.2IRD

Not Vulnerable

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

12.2IRE

Not Vulnerable

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

12.2IXA

Not Vulnerable

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

12.2IXB

Not Vulnerable

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

12.2IXC

Not Vulnerable

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

12.2IXD

Not Vulnerable

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

12.2IXE

Not Vulnerable

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

12.2IXF

Not Vulnerable

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

12.2IXG

Not Vulnerable

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

12.2IXH

Not Vulnerable

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

12.2JA

Not Vulnerable

Not Vulnerable

12.2JK

Not Vulnerable

Not Vulnerable

12.2MB

Not Vulnerable

Not Vulnerable

12.2MC

Not Vulnerable

Releases up to and including 12.2(15)MC1 are not vulnerable. Releases 12.2(15)MC2b and later are not vulnerable; first fixed in 12.4T

12.2MRA

Not Vulnerable

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

12.2MRB

Not Vulnerable

12.2(33)MRB2

12.2S

Not Vulnerable

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

12.2SB

Not Vulnerable

12.2(31)SB19; Releases prior to 12.2(33)SB5 are vulnerable, release 12.2(33)SB5 and later are not vulnerable

12.2SBC

Not Vulnerable

Vulnerable; first fixed in 12.2SB

12.2SCA

Not Vulnerable

Vulnerable; first fixed in 12.2SCB

12.2SCB

Not Vulnerable

12.2(33)SCB9

12.2SCC

Not Vulnerable

12.2(33)SCC5

12.2SCD

Not Vulnerable

12.2(33)SCD3

12.2SE

Not Vulnerable

Not Vulnerable

12.2SEA

Not Vulnerable

Not Vulnerable

12.2SEB

Not Vulnerable

Not Vulnerable

12.2SEC

Not Vulnerable

Not Vulnerable

12.2SED

Not Vulnerable

Not Vulnerable

12.2SEE

Not Vulnerable

Not Vulnerable

12.2SEF

Not Vulnerable

Not Vulnerable

12.2SEG

Not Vulnerable

Not Vulnerable

12.2SG

Not Vulnerable

Releases prior to 12.2(40)SG are vulnerable, release 12.2(40)SG and later are not vulnerable; migrate to any release in 12.2SGA

12.2SGA

Not Vulnerable

Not Vulnerable

12.2SL

Not Vulnerable

Not Vulnerable

12.2SM

Not Vulnerable

Not Vulnerable

12.2SO

Not Vulnerable

Not Vulnerable

12.2SQ

Not Vulnerable

Not Vulnerable

12.2SRA

Not Vulnerable

Releases prior to 12.2(33)SRA6 are vulnerable, release 12.2(33)SRA6 and later are not vulnerable

12.2SRB

Not Vulnerable

Releases prior to 12.2(33)SRB1 are vulnerable, release 12.2(33)SRB1 and later are not vulnerable

12.2SRC

Not Vulnerable

Not Vulnerable

12.2SRD

Not Vulnerable

Not Vulnerable

12.2SRE

12.2(33)SRE1

12.2(33)SRE1

12.2STE

Not Vulnerable

Not Vulnerable

12.2SU

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.2SV

Not Vulnerable

Releases prior to 12.2(29b)SV1 are vulnerable, release 12.2(29b)SV1 and later are not vulnerable; migrate to any release in 12.2SVD

12.2SVA

Not Vulnerable

Not Vulnerable

12.2SVC

Not Vulnerable

Not Vulnerable

12.2SVD

Not Vulnerable

Not Vulnerable

12.2SVE

Not Vulnerable

Not Vulnerable

12.2SW

Not Vulnerable

Releases up to and including 12.2(21)SW1 are not vulnerable. Releases 12.2(25)SW12 and later are not vulnerable; first fixed in 12.4T

12.2SX

Not Vulnerable

Releases up to and including 12.2(14)SX2 are not vulnerable.

12.2SXA

Not Vulnerable

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

12.2SXB

Not Vulnerable

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

12.2SXD

Not Vulnerable

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

12.2SXE

Not Vulnerable

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

12.2SXF

Not Vulnerable

Releases prior to 12.2(18)SXF11 are vulnerable, releases 12.2(18)SXF11 and later are not vulnerable

12.2SXH

Not Vulnerable

Not Vulnerable

12.2SXI

Not Vulnerable

Not Vulnerable

12.2SY

Not Vulnerable

Not Vulnerable

12.2SZ

Not Vulnerable

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

12.2T

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.2TPC

Not Vulnerable

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

12.2XA

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.2XB

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.2XC

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.2XD

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.2XE

Not Vulnerable

Not Vulnerable

12.2XF

Not Vulnerable

Not Vulnerable

12.2XG

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.2XH

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.2XI

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.2XJ

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.2XK

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.2XL

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.2XM

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.2XN

Not Vulnerable

Vulnerable; first fixed in 12.2SB

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; first fixed in 12.4T

12.2XR

Not Vulnerable

Not Vulnerable

12.2XS

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.2XT

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.2XU

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.2XV

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.2XW

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.2YA

Not Vulnerable

Vulnerable; first fixed in 12.4T

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

Not Vulnerable

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

12.2YE

Not Vulnerable

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

12.2YF

Not Vulnerable

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

12.2YG

Not Vulnerable

Not Vulnerable

12.2YH

Not Vulnerable

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

12.2YJ

Not Vulnerable

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

12.2YK

Not Vulnerable

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

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; first fixed in 12.4T

12.2YN

Not Vulnerable

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

12.2YO

Not Vulnerable

Not Vulnerable

12.2YP

Not Vulnerable

Not Vulnerable

12.2YQ

Not Vulnerable

Not Vulnerable

12.2YR

Not Vulnerable

Not Vulnerable

12.2YS

Not Vulnerable

Not Vulnerable

12.2YT

Not Vulnerable

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

Releases prior to 12.2(11)YV1 are vulnerable, release 12.2(11)YV1 and later are not vulnerable

12.2YW

Not Vulnerable

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

12.2YX

Not Vulnerable

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

12.2YY

Not Vulnerable

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

12.2YZ

Not Vulnerable

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

12.2ZA

Not Vulnerable

Not Vulnerable

12.2ZB

Not Vulnerable

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

12.2ZC

Not Vulnerable

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

12.2ZD

Not Vulnerable

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

12.2ZE

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.2ZF

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.2ZG

Not Vulnerable

Not Vulnerable

12.2ZH

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.2ZJ

Not Vulnerable

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

Not Vulnerable

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

12.2ZX

Not Vulnerable

Not Vulnerable

12.2ZY

Not Vulnerable

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

12.2ZYA

Not Vulnerable

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 the September 2010 Bundle Publication

12.3

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.3B

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.3BC

Not Vulnerable

Not Vulnerable

12.3BW

Not Vulnerable

Not Vulnerable

12.3EU

Not Vulnerable

Not Vulnerable

12.3JA

Not Vulnerable

Not Vulnerable

12.3JEA

Not Vulnerable

Not Vulnerable

12.3JEB

Not Vulnerable

Not Vulnerable

12.3JEC

Not Vulnerable

Not Vulnerable

12.3JED

Not Vulnerable

Not Vulnerable

12.3JK

Not Vulnerable

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 12.4T

12.3JL

Not Vulnerable

Not Vulnerable

12.3JX

Not Vulnerable

Not Vulnerable

12.3T

Vulnerable; first fixed in 12.4

Releases up to and including 12.3(11)T11 are not vulnerable.

Vulnerable; first fixed in 12.4T

12.3TPC

Not Vulnerable

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

12.3VA

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.3XA

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.3XB

Not Vulnerable

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

12.3XC

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.3XD

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.3XE

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.3XF

Not Vulnerable

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

12.3XG

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.3XI

Not Vulnerable

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

12.3XJ

Not Vulnerable

Vulnerable; first fixed in 12.4XR

12.3XK

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.3XL

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.3XQ

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.3XR

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.3XS

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.3XU

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.3XW

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.3XX

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.3XY

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.3XZ

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.3YA

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.3YD

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.3YF

Not Vulnerable

Vulnerable; first fixed in 12.4XR

12.3YG

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.3YH

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.3YI

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.3YJ

Not Vulnerable

Vulnerable; first fixed in 12.4T

12.3YK

Vulnerable; first fixed in 12.4T

Vulnerable; first fixed in 12.4T

12.3YM

Vulnerable; first fixed in 12.4T

Vulnerable; first fixed in 12.4T

12.3YQ

Vulnerable; first fixed in 12.4T

Vulnerable; first fixed in 12.4T

12.3YS

Vulnerable; first fixed in 12.4T

Vulnerable; first fixed in 12.4T

12.3YT

Vulnerable; first fixed in 12.4T

Vulnerable; first fixed in 12.4T

12.3YU

Vulnerable; first fixed in 12.4T

Vulnerable; first fixed in 12.4T

12.3YX

12.3(14)YX17

Vulnerable; first fixed in 12.4XR

12.3YZ

Not Vulnerable

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

12.3ZA

Not Vulnerable

Vulnerable; first fixed in 12.4T

Affected 12.4-Based Releases

First Fixed Release for This Advisory

First Fixed Release for All Advisories in the September 2010 Bundle Publication

12.4

12.4(25d)

12.4(25d)

12.4GC

12.4(24)GC2

12.4(24)GC2

12.4JA

Not Vulnerable

Not Vulnerable

12.4JDA

Not Vulnerable

Not Vulnerable

12.4JDC

Not Vulnerable

Not Vulnerable

12.4JDD

Not Vulnerable

Not Vulnerable

12.4JHA

Not Vulnerable

Not Vulnerable

12.4JHB

Not Vulnerable

Not Vulnerable

12.4JK

Not Vulnerable

Not Vulnerable

12.4JL

Not Vulnerable

Not Vulnerable

12.4JMA

Not Vulnerable

Not Vulnerable

12.4JMB

Not Vulnerable

Not Vulnerable

12.4JX

Not Vulnerable

Not Vulnerable

12.4JY

Not Vulnerable

Not Vulnerable

12.4MD

12.4(24)MD2

12.4(24)MD2

12.4MDA

12.4(24)MDA1

12.4(22)MDA4

12.4(22)MDA4

12.4MR

Vulnerable; first fixed in 12.4MRA

Vulnerable; first fixed in 12.4MRA

12.4MRA

12.4(20)MRA1

12.4(20)MRA1

12.4SW

Releases prior to 12.4(15)SW6 are vulnerable, release 12.4(15)SW6 and later are not vulnerable; first fixed in 12.4T

Vulnerable; first fixed in 12.4T

12.4T

12.4(24)T3

12.4(22)T5

12.4(20)T5

12.4(15)T14

12.4(15)T14

12.4(20)T6

12.4(24)T4

12.4XA

Vulnerable; first fixed in 12.4T

Vulnerable; first fixed in 12.4T

12.4XB

Vulnerable; first fixed in 12.4T

Vulnerable; first fixed in 12.4T

12.4XC

Vulnerable; first fixed in 12.4T

Vulnerable; first fixed in 12.4T

12.4XD

Vulnerable; first fixed in 12.4T

Vulnerable; first fixed in 12.4T

12.4XE

Releases prior to 12.4(6)XE5 are vulnerable, release 12.4(6)XE5 and later are not vulnerable; first fixed in 12.4T

Releases prior to 12.4(6)XE5 are vulnerable, release 12.4(6)XE5 and later are not vulnerable; first fixed in 12.4T

12.4XF

Vulnerable; first fixed in 12.4T

Vulnerable; first fixed in 12.4T

12.4XG

Vulnerable; first fixed in 12.4T

Vulnerable; first fixed in 12.4T

12.4XJ

Vulnerable; first fixed in 12.4T

Vulnerable; first fixed in 12.4T

12.4XK

Vulnerable; first fixed in 12.4T

Vulnerable; first fixed in 12.4T

12.4XL

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

12.4XM

Vulnerable; first fixed in 12.4T

Vulnerable; first fixed in 12.4T

12.4XN

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

12.4XP

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

12.4XQ

12.4(15)XQ6; Available on 22-SEP-10

12.4(15)XQ6; Available on 22-SEP-10

12.4XR

12.4(15)XR9

12.4(22)XR7

12.4(15)XR9

12.4(22)XR7

12.4XT

Vulnerable; first fixed in 12.4T

Vulnerable; first fixed in 12.4T

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; first fixed in 12.4T

Vulnerable; first fixed in 12.4T

12.4XY

Vulnerable; first fixed in 12.4T

Vulnerable; first fixed in 12.4T

12.4XZ

Vulnerable; first fixed in 12.4T

Vulnerable; first fixed in 12.4T

12.4YA

Vulnerable; first fixed in 12.4T

Vulnerable; first fixed in 12.4T

12.4YB

12.4(22)YB6

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(24)YE1

12.4(22)YE4

12.4(24)YE1

12.4YG

12.4(24)YG3

12.4(24)YG3

Affected 15.0-Based Releases

First Fixed Release for This Advisory

First Fixed Release for All Advisories in the September 2010 Bundle Publication

15.0M

15.0(1)M2

15.0(1)M3

15.0S

Cisco 7600 and 10000 Series routers: Not vulnerable

Cisco ASR 1000 Series routes: Please see Cisco IOS-XE Software Availability

Cisco 7600 and 10000 Series routers: 15.0(1)S1 (Available early October 2010)

Cisco ASR 1000 Series routes: Please see Cisco IOS-XE Software Availability

15.0XA

Vulnerable; migrate to any release in 15.1T

Vulnerable; first fixed in 15.1T

15.0XO

Not Vulnerable

Not Vulnerable

Affected 15.1-Based Releases

First Fixed Release for This Advisory

First Fixed Release for All Advisories in the September 2010 Bundle Publication

There are no affected 15.1 based releases

Cisco IOS XE Software

Cisco IOS XE Release

First Fixed Release for This Advisory

First Fixed Release for All Advisories in the September 2010 Bundle Publication

2.1.x

Not Vulnerable

Not Vulnerable

2.2.x

Not Vulnerable

Not Vulnerable

2.3.x

Not Vulnerable

Not Vulnerable

2.4.x

Not Vulnerable

Not Vulnerable

2.5.x

2.5.2

Vulnerable; migrate to 2.6.2 or later

2.6.x

Not Vulnerable

2.6.2

3.1.xS

Not Vulnerable

Not Vulnerable

To map Cisco IOS XE Software releases to Cisco IOS Software releases, refer to the Cisco IOS XE 2 and Cisco IOS XE 3S Release Notes.

Cisco IOS XR Software Table

Cisco IOS XR Software is not affected by the vulnerabilities disclosed in the September 22, 2010, Cisco IOS Software Security Advisory bundle publication.


Workarounds

Additional mitigations that can be deployed on Cisco devices within the network are available in the Cisco Applied Mitigation Bulletin companion document for this advisory, which is available at the following link: http://tools.cisco.com/security/center/content/CiscoAppliedMitigationBulletin/cisco-amb-20100922-igmp.

IGMP version 2

Customers who do not require the Source Specific Multicast (SSM) functionality can use IGMP version 2 as a workaround.

interface GigabitEthernet0/0
 ip address 192.168.0.1 255.255.255.0
 ip pim sparse-mode
 ip igmp version 2

Control Plane Policing

A partial mitigation of the vulnerability described in this document is to block IGMP packets with an IP Time to Live (TTL) field value that is not equal to 1. RFC1054 leavingcisco.com, "Host Extensions for IP Multicasting" RFC2236 leavingcisco.com, "Internet Group Management Protocol Version 2", and RFC3376 leavingcisco.com, "Internet Group Management Protocol Version 3", indicate that every IGMP message is sent with an IP TTL of 1.

CoPP may be configured on a device to protect the management and control planes, and minimize the risk and effectiveness of direct infrastructure attacks by explicitly permitting only authorized traffic sent to infrastructure devices in accordance with existing security policies and configurations. The following example can be adapted to your network. Drop of IGMP packets with unicast IP destination addresses can also be implemented with CoPP if the network is using all multicast applications that utilize only multicast group destination addresses for IGMP packets.


!
!-- The following access list is used
!-- to determine what traffic needs to be dropped by a control plane
!-- policy (the CoPP feature.) If the access list matches (permit),
!-- then traffic will be dropped. If the access list does not
!-- match (deny), then traffic will be processed by the router.
!-- all IGMP packets with ttl different from 1 will be selected 
!-- by this acl and the "drop" action will be applied in the
!-- corresponding CoPP polisy
!


ip access-list extended IGMP-ACL
  permit igmp any any ttl neq 1



!
!-- 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 that will be policed by
!-- the CoPP feature.
!


class-map match-all drop-IGMP-class
  match access-group name IGMP-ACL


!
!-- Create a policy map that will be applied to the
!-- Control Plane of the device, and add the "drop-tcp-traffic"
!-- class map.
!


policy-map CoPP-policy
 class drop-IGMP-class
  drop


!
!-- Apply the policy map to the control plane of the
!-- device.
!


control-plane
 service-policy input CoPP-policy

Additional information on the configuration and use of the CoPP feature is available in the Control Plane Policing Implementation Best Practices.

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/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 with Service Contracts

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

Customers Using Third-Party Support Organizations

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

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

Customers Without Service Contracts

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

  • +1 800 553 2447 (toll free from within North America)
  • +1 408 526 7209 (toll call from anywhere in the world)
  • e-mail: tac@cisco.com

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

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

Exploitation and Public Announcements

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

This vulnerability was reported to Cisco by a customer.

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-20100922-igmp

In addition to worldwide web posting, a text version of this notice is clear-signed with the Cisco PSIRT PGP key and is posted to the following e-mail and Usenet news recipients.

  • cust-security-announce@cisco.com
  • first-bulletins@lists.first.org
  • bugtraq@securityfocus.com
  • vulnwatch@vulnwatch.org
  • cisco@spot.colorado.edu
  • cisco-nsp@puck.nether.net
  • full-disclosure@lists.grok.org.uk
  • comp.dcom.sys.cisco@newsgate.cisco.com

Future updates of this advisory, if any, will be placed on Cisco's worldwide website, but may or may not be actively announced on mailing lists or newsgroups. Users concerned about this problem are encouraged to check the above URL for any updates.


Revision History

Revision 1.0

2010-Sep-22

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.


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