Cisco Security Advisory: Cisco IOS Software Internet Group Management Protocol Denial of Service Vulnerability

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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
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 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 , "Host Extensions for IP Multicasting" RFC2236 , "Internet Group Management Protocol Version 2", and RFC3376 , "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/en/US/products/products_security_vulnerability_policy.html. This includes instructions for press inquiries regarding Cisco security notices. All Cisco security advisories are available at http://www.cisco.com/go/psirt.

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Cisco Security Advisory

Cisco IOS Software Internet Group Management Protocol Denial of Service Vulnerability

Advisory ID: 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)

Contents

writePM('affected')Affected Products

writePM('vps') Vulnerable Products

writePM('nonvulnerable')Products Confirmed Not Vulnerable

writePM('details')Details

writePM('vulnerability')Vulnerability Scoring Details

writePM('impact')Impact

writePM('software')Software Versions and Fixes

Cisco IOS XE Software

Cisco IOS XR Software Table

writePM('workarounds')Workarounds

IGMP version 2

Control Plane Policing

writePM('fixes')Obtaining Fixed Software

writePM('CustomerswithServiceContracts')Customers with Service Contracts

writePM('CustomerSupportOrganizationsConcepts')Customers Using Third-Party Support Organizations

writePM('CustomerswithoutServiceContracts')Customers Without Service Contracts

writePM('exploitation')Exploitation and Public Announcements

writePM('status')Status of This Notice: Final

writePM('distribution')Distribution

writePM('revision')Revision History

writePM('secpro')Cisco Security Procedures

Related Links

Tools

Products & Services

Solutions

Affected Products

Vulnerable Products

Products Confirmed Not Vulnerable

Details

Vulnerability Scoring Details

Impact

Software Versions and Fixes

Workarounds

Obtaining Fixed Software

Customers with Service Contracts

Customers Using Third-Party Support Organizations

Customers Without Service Contracts

Exploitation and Public Announcements

Status of This Notice: Final

Distribution

Revision History

Cisco Security Procedures