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Cisco Security Advisory

Cisco IOS Software Mobile IP and Mobile IPv6 Vulnerabilities

High
Advisory ID:
cisco-sa-20090325-mobileip
First Published:
2009 March 25 16:00 GMT
Version 1.3:
Final
Workarounds:
See below
Cisco Bug IDs:
CSCsm97220
CSCso05337
CVE-2009-0633
CVE-2009-0634
CVSS Score:
Base 7.8, Temporal 6.4Click Icon to Copy Verbose Score
AV:N/AC:L/Au:N/C:N/I:N/A:C/E:F/RL:OF/RC:C
CVE-2009-0633
CVE-2009-0634

Summary

Affected Products

  • Devices that are running an affected version of Cisco IOS Software and configured for Mobile IP NAT Traversal feature or Mobile IPv6 are vulnerable.

    Vulnerable Products

    Devices running Cisco IOS Software and configured for Mobile IP NAT Traversal feature will have a line similar to the following in the output of the show running-config command:

    ip mobile home-agent nat traversal [...]

    or

    ip mobile foreign-agent nat traversal [...]

    or

    ip mobile router-service collocated registration nat traversal [...]

    Devices running Cisco IOS Software and configured for Mobile IPv6 will have a line similar to the following in the output of the show running-config command:

    ipv6 mobile home-agent

    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 12.3(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 (c) 1986-2008 by cisco Systems, Inc.
    Compiled Mon 17-Mar-08 14:39 by dchih


    !--- output truncated

    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


    !--- output truncated

    Additional information about Cisco IOS Software release naming conventions is available in "White Paper: Cisco IOS Reference Guide" at the following link: http://www.cisco.com/warp/public/620/1.html.

    Products Confirmed Not Vulnerable

    Cisco IOS XR is not affected by these vulnerabilities.

    Cisco IOS XE is not affected by these vulnerabilities.

    No other Cisco products are currently known to be affected by these vulnerabilities.

Details

  • Mobile IP is part of both IPv4 and IPv6 standards. Mobile IP allows a host device to be identified by a single IP address even though the device may move its physical point of attachment from one network to another. Regardless of movement between different networks, connectivity at the different points is achieved seamlessly without user intervention. Roaming from a wired network to a wireless or wide-area network is also possible.

    More information on Mobile IPv6 can be found at the following link: http://www.cisco.com/en/US/docs/ios/ipv6/configuration/guide/ip6-mobile.html

    The Mobile IP Support NAT Traversal feature is documented in RFC 3519. It introduces an alternative method for tunneling Mobile IP data traffic. New extensions in the Mobile IP registration request and reply messages have been added for establishing User Datagram Protocol (UDP) tunneling. This feature allows mobile devices in collocated mode that use a private IP address (RFC 1918) or foreign agents (FAs) that use a private IP address for the care-of address (CoA) to establish a tunnel and traverse a NAT-enabled router with mobile node (MN) data traffic from the home agent (HA).

    More information on Mobile IP NAT Traversal feature can be found at the following link: http://www.cisco.com/en/US/docs/ios/12_3t/12_3t8/feature/guide/gtnatmip.html

    Devices that are running an affected version of Cisco IOS Software and configured for Mobile IPv6 or Mobile IP NAT Traversal feature are affected by a DoS vulnerability. A successful exploitation of this vulnerability could cause an interface to stop processing traffic until the system is restarted. Offending packets need to be destined to the router for a successful exploit.

    These vulnerabilities are documented in the Cisco Bug IDs CSCsm97220 ( registered customers only) and CSCso05337 ( registered customers only) and have been assigned Common Vulnerabilities and Exposures (CVE) IDs CVE-2009-0633 and CVE-2009-0634.

Workarounds

  • The following mitigation and identification methods have been identified for these vulnerabilities:

    Infrastructure Access Control Lists

    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 networks. Infrastructure Access Control Lists (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 these specific vulnerabilities. The iACL example below should be included as part of the deployed infrastructure access-list which will protect all devices with IP addresses in the infrastructure IP address range:

    IPv4 example: 

    
!--- Anti-spoofing entries are shown here.


!--- Deny special-use address sources.
!--- Refer to RFC 3330 for additional special use addresses.


access-list 110 deny ip host 0.0.0.0 any
access-list 110 deny ip 127.0.0.0 0.255.255.255 any
access-list 110 deny ip 192.0.2.0 0.0.0.255 any
access-list 110 deny ip 224.0.0.0 31.255.255.255 any


!--- Filter RFC 1918 space.


access-list 110 deny ip 10.0.0.0 0.255.255.255 any
access-list 110 deny ip 172.16.0.0 0.15.255.255 any
access-list 110 deny ip 192.168.0.0 0.0.255.255 any


!--- Deny your space as source from entering your AS.
!--- Deploy only at the AS edge.



access-list 110 deny ip YOUR_CIDR_BLOCK any


!--- Permit BGP.


access-list 110 permit tcp host bgp_peer host router_ip eq bgp 
access-list 110 permit tcp host bgp_peer eq bgp host router_ip


!--- Deny access to internal infrastructure addresses.


access-list 110 deny ip any INTERNAL_INFRASTRUCTURE_ADDRESSES


!--- Permit transit traffic.


access-list 110 permit ip any any

    IPv6 example: 

    
!--- Configure the access-list.


ipv6 access-list iacl


!--- Deny your space as source from entering your AS.
!--- Deploy only at the AS edge.


 deny ipv6 YOUR_CIDR_BLOCK_IPV6 any


!--- Permit multiprotocol BGP.


 permit tcp host bgp_peer_ipv6 host router_ipv6 eq bgp
 permit tcp host bgp_peer_ipv6 eq bgp host router_ipv6


!--- Deny access to internal infrastructure addresses.

 
deny ipv6 any INTERNAL_INFRASTRUCTURE_ADDRESSES_IPV6


!--- Permit transit traffic.


 permit ipv6 any any

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

    Cisco IOS Embedded Event Manager

    It is possible to detect blocked interface queues with a Cisco IOS Embedded Event Manager (EEM) policy. EEM provides event detection and reaction capabilities on a Cisco IOS device. EEM can alert administrators of blocked interfaces with email, a syslog message, or a Simple Network Management Protocol (SNMP) trap.

    A sample EEM policy that uses syslog to alert administrators of blocked interfaces is available at Cisco Beyond, an online community dedicated to EEM. A sample script is available at the following link:

    http://forums.cisco.com/eforum/servlet/EEM?page=eem&fn=script&scriptId=981

    More information about EEM is available from Cisco.com at the following link: http://www.cisco.com/en/US/products/ps6815/products_ios_protocol_group_home.html

Fixed Software

  • When considering software upgrades, also consult http://www.cisco.com/go/psirt and any subsequent advisories to determine exposure and a complete upgrade solution.

    In all cases, customers should exercise caution to be certain the devices to be upgraded contain sufficient memory and that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, contact the Cisco Technical Assistance Center (TAC) or your contracted maintenance provider for assistance.

    Each row of the Cisco IOS software table (below) names a Cisco IOS release train. If a given release train is vulnerable, then the earliest possible releases that contain the fix (along with the anticipated date of availability for each, if applicable) are listed in the "First Fixed Release" column of the table. The "Recommended Release" column indicates the releases which have fixes for all the published vulnerabilities at the time of this Advisory. A device running a release in the given train that is earlier than the release in a specific column (less than the First Fixed Release) is known to be vulnerable. Cisco recommends upgrading to a release equal to or later than the release in the "Recommended Releases" column of the table.

    Major Release

    Availability of Repaired Releases

    Affected 12.0-Based Releases

    First Fixed Release

    Recommended Release

    There are no affected 12.0 based releases

    Affected 12.1-Based Releases

    First Fixed Release

    Recommended Release

    There are no affected 12.1 based releases

    Affected 12.2-Based Releases

    First Fixed Release

    Recommended Release

    There are no affected 12.2 based releases

    Affected 12.3-Based Releases

    First Fixed Release

    Recommended Release

    12.3

    Not Vulnerable

    12.3B

    Not Vulnerable

    12.3BC

    Not Vulnerable

    12.3BW

    Not Vulnerable

    12.3EU

    Not Vulnerable

    12.3JA

    Not Vulnerable

    12.3JEA

    Not Vulnerable

    12.3JEB

    Not Vulnerable

    12.3JEC

    Not Vulnerable

    12.3JK

    Not Vulnerable

    12.3JL

    Not Vulnerable

    12.3JX

    Not Vulnerable

    12.3T

    Vulnerable; first fixed in 12.4T

    12.4(22)T1

    12.4(15)T9; Available on 29-APR-2009

    12.3TPC

    Not Vulnerable

    12.3VA

    Not Vulnerable

    12.3XA

    Not Vulnerable

    12.3XB

    Not Vulnerable

    12.3XC

    Not Vulnerable

    12.3XD

    Not Vulnerable

    12.3XE

    Not Vulnerable

    12.3XF

    Not Vulnerable

    12.3XG

    Not Vulnerable

    12.3XI

    Not Vulnerable

    12.3XJ

    Not Vulnerable

    12.3XK

    Not Vulnerable

    12.3XL

    Not Vulnerable

    12.3XQ

    Not Vulnerable

    12.3XR

    Not Vulnerable

    12.3XS

    Not Vulnerable

    12.3XU

    Not Vulnerable

    12.3XW

    Not Vulnerable

    12.3XX

    Not Vulnerable

    12.3XY

    Not Vulnerable

    12.3XZ

    Not Vulnerable

    12.3YA

    Not Vulnerable

    12.3YD

    Not Vulnerable

    12.3YF

    Not Vulnerable

    12.3YG

    Not Vulnerable

    12.3YH

    Not Vulnerable

    12.3YI

    Not Vulnerable

    12.3YJ

    Not Vulnerable

    12.3YK

    Releases prior to 12.3(11)YK3 are vulnerable, release 12.3(11)YK3 and later are not vulnerable; first fixed in 12.4T

    12.4(22)T1

    12.4(15)T9; Available on 29-APR-2009

    12.3YM

    12.3(14)YM13

    12.3(14)YM13

    12.3YQ

    Vulnerable; first fixed in 12.4T

    12.4(22)T1

    12.4(15)T9; Available on 29-APR-2009

    12.3YS

    Vulnerable; first fixed in 12.4T

    12.4(22)T1

    12.4(15)T9; Available on 29-APR-2009

    12.3YT

    Vulnerable; first fixed in 12.4T

    12.4(22)T1

    12.4(15)T9; Available on 29-APR-2009

    12.3YU

    Vulnerable; migrate to 12.4T

    12.4(22)T1

    12.4(15)T9; Available on 29-APR-2009

    12.3YX

    Releases prior to 12.3(14)YX10 are vulnerable, release 12.3(14)YX10 and later are not vulnerable;

    12.3(14)YX14

    12.3YZ

    Not Vulnerable

    12.3ZA

    Not Vulnerable

    Affected 12.4-Based Releases

    First Fixed Release

    Recommended Release

    12.4

    12.4(18e)

    12.4(23a); Available on 05-JUN-2009

    12.4(18e)

    12.4(23a); Available on 05-JUN-2009

    12.4JA

    Not Vulnerable

    12.4JDA

    Not Vulnerable

    12.4JK

    Not Vulnerable

    12.4JL

    Not Vulnerable

    12.4JMA

    Not Vulnerable

    12.4JMB

    Not Vulnerable

    12.4JX

    Not Vulnerable

    12.4MD

    Not Vulnerable

    12.4MR

    12.4(19)MR

    12.4(19)MR2

    12.4SW

    Not Vulnerable

    12.4T

    12.4(20)T

    12.4(15)T8

    12.4(15)T9; Available on 29-APR-2009

    12.4(22)T1

    12.4(15)T9; Available on 29-APR-2009

    12.4XA

    Vulnerable; first fixed in 12.4T

    12.4(22)T1

    12.4(15)T9; Available on 29-APR-2009

    12.4XB

    12.4(15)T8

    12.4(20)T

    12.4(15)T9; Available on 29-APR-2009

    12.4(22)T1

    12.4(15)T9; Available on 29-APR-2009

    12.4XC

    Vulnerable; first fixed in 12.4T

    12.4(22)T1

    12.4(15)T9; Available on 29-APR-2009

    12.4XD

    12.4(4)XD12; Available on 27-MAR-2009

    12.4(4)XD12; Available on 27-MAR-2009

    12.4XE

    Vulnerable; first fixed in 12.4T

    12.4(22)T1

    12.4(15)T9; Available on 29-APR-2009

    12.4XF

    Vulnerable; first fixed in 12.4T

    12.4(22)T1

    12.4(15)T9; Available on 29-APR-2009

    12.4XG

    Not Vulnerable

    12.4XJ

    Vulnerable; first fixed in 12.4T

    12.4(22)T1

    12.4(15)T9; Available on 29-APR-2009

    12.4XK

    Not Vulnerable

    12.4XL

    12.4(15)XL4

    12.4(15)XL4

    12.4XM

    Vulnerable; first fixed in 12.4T

    12.4(22)T1

    12.4(15)T9; Available on 29-APR-2009

    12.4XN

    Vulnerable; contact TAC

    12.4XP

    Vulnerable; contact TAC

    12.4XQ

    12.4(15)XQ2

    12.4(15)XQ2

    12.4XR

    12.4(15)XR4

    12.4(22)T1

    12.4XT

    Vulnerable; first fixed in 12.4T

    12.4(22)T1

    12.4(15)T9; Available on 29-APR-2009

    12.4XV

    Vulnerable; contact TAC

    12.4XW

    12.4(11)XW10

    12.4(11)XW10

    12.4XY

    12.4(15)XY4

    12.4(22)T1

    12.4(15)T9; Available on 29-APR-2009

    12.4XZ

    12.4(15)XZ1

    12.4(15)XZ2

    12.4YA

    Not Vulnerable

    12.4YB

    Not Vulnerable

    12.4YD

    Not Vulnerable

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.

Cisco Security Vulnerability Policy

  • To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.

Subscribe to Cisco Security Notifications

Related to This Advisory

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Revision History

  • Revision 1.3

    2009-June-25

    Removed references to the March/09 combined fixed software table.

    Revision 1.2

    2009-June-1

    Updated expected public availability date for release 12.4(23a).

    Revision 1.1

    2009-May-1

    Updated expected public availability date for release 12.4(23a).

    Revision 1.0

    2009-Mar-25

    Initial public release

    Show Less

Cisco Security Vulnerability Policy

  • To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.

Subscribe to Cisco Security Notifications

Related to This Advisory