Cisco Security Advisory
Information Leakage Using IPv6 Routing Header in Cisco IOS and Cisco IOS-XR
Click Icon to Copy Verbose Score
AV:R/AC:L/Au:NR/C:P/I:P/A:C/B:N/E:F/RL:O/RC:C
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Cisco IOS and Cisco IOS XR contain a vulnerability when processing specially crafted IPv6 packets with a Type 0 Routing Header present. Exploitation of this vulnerability can lead to information leakage on affected IOS and IOS XR devices, and may also result in a crash of the affected IOS device. Successful exploitation on an affected device running Cisco IOS XR will not result in a crash of the device itself, but may result in a crash of the IPv6 subsystem.
Cisco has made free software available to address this vulnerability for affected customers. There are workarounds available to mitigate the effects of the vulnerability.
This advisory is posted at https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20070808-IOS-IPv6-leak.
Note: The August 08, 2007 publication includes four Security Advisories and one Security Response. The advisories all affect IOS, one additionally affects Cisco Unified Communications Manager as well. Each advisory lists the releases that correct the vulnerability described in the advisory, and the advisories also detail the releases that correct the vulnerabilities in all four advisories. Individual publication links are listed below:
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Cisco IOS Information Leakage Using IPv6 Routing Header
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20070808-IOS-IPv6-leak
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Cisco IOS Next Hop Resolution Protocol Vulnerability
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20070808-nhrp
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Cisco IOS Secure Copy Authorization Bypass Vulnerability
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20070808-scp
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Voice Vulnerabilities in Cisco IOS and Cisco Unified Communications
Manager
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20070808-IOS-voice
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Cisco Unified MeetingPlace XSS Vulnerability
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityResponse/cisco-sr-20070808-mp
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Cisco IOS Information Leakage Using IPv6 Routing Header
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Vulnerable Products
This vulnerability affects devices that are configured to use the IPv6 protocol and are running affected versions of one of the following types of software:
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Cisco IOS
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Cisco IOS XR
To determine the software running on a Cisco IOS product, log in to the device and issue the show version command to display the system banner. Cisco IOS software will identify itself as "Internetwork Operating System Software" or simply "IOS." On the next line of output, the image name will be displayed between parentheses, followed by "Version" and the Cisco IOS release name. Other Cisco devices will not have the show version command, or will give different output.
The following example shows output from a device running an IOS image:
Router>show version Cisco IOS Software, 7200 Software (C7200-IK9S-M), Version 12.3(14)T1, RELEASE SOFTWARE (fc1) Technical Support: http://www.cisco.com/techsupport Copyright (c) 1986-2005 by Cisco Systems, Inc. Compiled Thu 31-Mar-05 08:04 by yiyan
Additional information about Cisco IOS release naming is available at the following link: http://www.cisco.com/warp/public/620/1.html.
To determine whether IPv6 is configured on an IOS device, look for the lines containing ipv6 in the Cisco IOS configuration, as shown in the following example:
Router#show running-config | include ipv6 ipv6 address 2001:0DB8:C18:1::/64 eui-64
If the configuration contains a line or lines similar to the above example, IPv6 is configured on the device. The exact IPv6 address will vary in your configuration.
To determine whether IPv6 is configured on an IOS XR device, look for the following lines in in the Cisco IOS XR configuration:
Router-IOS_XR#show ipv6 interface | include IPv6 IPv6 is enabled, link-local address is fe80::216:47ff:fee1:d987 IPv6 is disabled, link-local address unassigned IPv6 is disabled, link-local address unassigned
If the output contains at least one line that reads IPv6 is enabled, IPv6 is configured on the device.
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this vulnerability. In particular, the following devices are known not to be affected:
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Cisco PIX and ASA Appliances
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Cisco Firewall Services Module (FWSM)
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Cisco MDS
Cisco PIX, ASA, and FWSM firewall products do not process packets containing IPv6 Routing headers. All such packets will be silently dropped.
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Cisco IOS
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Successful exploitation of the vulnerability described in this document may result in swapping memory between the destination IPv6 address in the IPv6 packet header and 16 bytes from the packet buffer memory. Memory that can be accessed through this vulnerability can not be further than 1500 bytes from the packet header start.
This vulnerability is documented for Cisco IOS as Cisco Bug ID CSCef77013 ( registered customers only) and for Cisco IOS XR as Cisco Bug ID CSCsi74127 ( registered customers only) .
Vulnerability Scoring Details
Cisco is providing scores for the vulnerabilities in this advisory based on the Common Vulnerability Scoring System (CVSS). The CVSS scoring in this Security Advisory is done in accordance with CVSS version 1.0.
Cisco will provide a base and temporal score. Customers can then compute environmental scores to assist in determining the impact of the vulnerability in individual networks.
Cisco PSIRT will set the bias in all cases to normal. Customers are encouraged to apply the bias parameter when determining the environmental impact of a particular vulnerability.
CVSS is a standards based scoring method that conveys vulnerability severity and helps determine urgency and priority of response.
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 https://sec.cloudapps.cisco.com/security/center/cvssCalculator.x.
CSCef77013 - Tighter parameter checking for IPv6 ( registered customers only)
Calculate the environmental score of CSCef77013
CVSS Base Score - 8
Access Vector
Access Complexity
Authentication
Confidentiality Impact
Integrity Impact
Availability Impact
Impact Bias
Remote
Low
Not Required
Partial
Partial
Complete
Normal
Temporal Score - 6.6
Exploitability
Remediation Level
Report Confidence
Functional
Official Fix
Confirmed
CSCsi74127 - Processing of IPv6 headers ( registered customers only)
Calculate the environmental score of CSCsi74127
CVSS Base Score - 7
Access Vector
Access Complexity
Authentication
Confidentiality Impact
Integrity Impact
Availability Impact
Impact Bias
Remote
Low
Not Required
Partial
Partial
Partial
Normal
Temporal Score - 5.8
Exploitability
Remediation Level
Report Confidence
Functional
Official Fix
Confirmed
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The workaround consists of filtering packets that contain Type 0 Routing header(s). Special attention must be paid not to filter packets with Type 2 Routing headers as that would break a Mobile IPv6 deployment. Depending on which Cisco IOS software release is used, and if Mobile IPv6 is deployed, there are several potential workarounds. Because any packet type (TCP, UDP, ICMP) can be used to trigger this vulnerability, care must be taken when implementing a workaround to account for a spoofed IPv6 packet.
For devices running Cisco IOS XR and have mobile IPv6 deployed, there is no workaround.
For additional information about protection mechanisms against IPv6 Routing headers, reference the "Countermeasures for the Malicious Use of IPv6 Type 0 Routing Headers" Applied Intelligence white paper, available at
http://www.cisco.com/web/about/security/intelligence/countermeasures-for-ipv6-type0-rh.html.
Devices Running Cisco IOS
Control Plane Policing
The following example is applicable irrespectively if Mobile IPv6 is, or is not, deployed.
Control Plane Policing (CoPP) can be used to block untrusted IPv6 packets with Type 0 Routing Headers present to the affected device. Cisco IOS software releases 12.0S, 12.2SX, 12.2S, 12.3T, 12.4, and 12.4T support the CoPP feature. CoPP may be configured on a device to protect the management and control planes to 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.
!-- Permit all IPv6 Routing Header Type 0 (Source Route) packets !-- sent to any IPv6 address configured on interfaces of the !-- affected device or IPv6 link-local addresses. This traffic !-- will be policed and dropped by the CoPP feature. ! ipv6 access-list DENY-IPv6-RH0 permit ipv6 any any routing-type 0 ! !-- Permit (Police or Drop)/Deny (Allow) all other Layer3 and Layer4 !-- traffic in accordance with existing security policies and !-- configurations for traffic that is authorized to be sent !-- to infrastructure devices. ! !-- Create a Class-Map for traffic to be policed by the CoPP feature. ! class-map match-all drop-IPv6-RH0-class match access-group name DENY-IPv6-RH0 ! !-- Create a Policy-Map that will be applied to the Control-Plane of !-- the device. policy-map drop-IPv6-RH0-traffic class drop-IPv6-RH0-class drop ! !-- Apply the Policy-Map to the Control-Plane of the device. control-plane service-policy input drop-IPv6-RH0-traffic !
In the above CoPP example, the access control list entries (ACEs), which match the potential exploit packets with the "permit" action, result in these packets being discarded by the policy-map "drop" function.
Additional information on the configuration and use of the CoPP feature can be found at http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6586/ps6642/prod_white_paper0900aecd804fa16a.html and http://www.cisco.com/en/US/docs/ios/12_3t/12_3t4/feature/guide/gtrtlimt.html.
Mobile IPv6 is Not Deployed
For IOS releases prior to 12.2(15)T, the workaround is to use ACLs to filter all packets that contain Routing headers. This method can not distinguish between Type 0 and Type 2 Routing headers, so it is not suitable if Mobile IPv6 is deployed.
The following example shows how to configure such ACLs:
Router(config)#ipv6 access-list deny-sourcerouted Router(config-ipv6-acl)#deny ipv6 any
routing Router(config-ipv6-acl)#deny ipv6 any routing Router(config-ipv6-acl)#permit ipv6 any any Router(config-ipv6-acl)#exit Router(config)#interface Ethernet0 Router(config-if)#ipv6 traffic-filter deny-sourcerouted in In the above example
is an IPv6 address. One example of such an address is 2001:DB8:900D::1/64. The ACL must be applied to all interfaces and include all IPv6 addresses that are configured. If an interface has more than one IPv6 address configured then all addresses must be covered by the ACLs. This also includes all loopback and link local addresses for each interface. The alternative to enumerating all IPv6 addresses is to use the statement deny ipv6 any any routing. While that simplifies the resulting ACL, it will also filter all transit IPv6 traffic with Routing headers 0 and 2. The example in which all configured IPv6 addresses are enumerated will not affect transit traffic. This is applicable to all other examples in this advisory.
Starting from the IOS release 12.2(15)T, a new command, ipv6 source-route was introduced. If applied, it will drop any IPv6 packet with Type 0 Routing Headers received by the device itself (for example, IPv6 destination address matches any of the IPv6 addresses configured on the device). The command does not affects transit traffic. The configuration is given in the following example:
Router(config)#no ipv6 source-route
This is a global command and it applies to all interfaces. The command is applicable on all defined IPv6 addresses, including the link local and loopback address, and on all interfaces.
Mobile IPv6 is Deployed
There is no workaround for devices running a Cisco IOS release prior to 12.2(15)T. Starting from the IOS release 12.2(15)T, a new command, ipv6 source-route was introduced. If applied, it will drop any IPv6 packet with Type 0 Routing Headers received by the device itself (for example, IPv6 destination address matches any of the IPv6 addresses configured on the device). The command does not affects transit traffic. The configuration is given in the following example:
Router(config)#no ipv6 source-route
This is a global command and it applies to all interfaces. The command is applicable on all defined IPv6 addresses, including the link local and loopback address, and on all interfaces.
In IOS 12.4(2)T, a new keyword routing-type is added to IPv6 ACLs. It can be used to selectively permit or deny specific routing types.
Router(config)#ipv6 access-list deny-sourcerouted Router(config-ipv6-acl)#deny ipv6 anyrouting-type 0 Router(config-ipv6-acl)#permit ipv6 any any Router(config)#interface Ethernet0 Router(config-if)#ipv6 traffic-filter deny-sourcerouted in The above IPv6 ACL must be applied inbound on all interfaces on which an IPv6 address is configured.
Devices Running Cisco IOS XR
Mobile IPv6 is Not Deployed
The workaround is to use ACLs to filter all packets that contain Routing headers. This method can not distinguish between Type 0 and Type 2 Routing headers, so it is not suitable if Mobile IPv6 is deployed.
The following example shows how to configure such ACLs:
Router-IOS_XR#configure terminal Router-IOS_XR(config)#ipv6 access-list deny-ipv6-type0-rh Router-IOS_XR(config-ipv6-acl)#deny ipv6 any host 2001:0DB8:12::3 routing Router-IOS_XR(config-ipv6-acl)#permit ipv6 any any Router-IOS_XR(config-ipv6-acl)#exit Router-IOS_XR(config)#interface GigabitEthernet 0/0/0/1 Router-IOS_XR(config-if)#ipv6 access-group deny-ipv6-type0-rh ingress Router-IOS_XR(config-if)#end
The ACL must be applied to all interfaces and include all IPv6 addresses that are configured. If an interface has more than one IPv6 address configured then all addresses must be covered by the ACLs. This also includes all loopback and link local addresses for each interface.
Mobile IPv6 is Deployed
There is no workaround if Mobile IPv6 is deployed.
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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.
For further information about how Cisco IOS is built, numbered and maintained, please see the following URL: http://www.cisco.com/warp/public/620/1.html
Major Release
Availability of Repaired Releases
Affected 12.0-Based Release
First Fixed Release
Recommended Release
12.0
Not Vulnerable
12.0DA
Not Vulnerable
12.0DB
Not Vulnerable
12.0DC
Not Vulnerable
12.0S
12.0(32)S8; available 21-Aug-07
12.0(32)S8; available 21-Aug-07
12.0SC
Not Vulnerable
12.0SL
Not Vulnerable
12.0SP
Not Vulnerable
12.0ST
Vulnerable; first fixed in 12.0(32)S8 available 21-Aug-07
12.0(32)S8; available 21-Aug-07
12.0SX
Vulnerable; first fixed in 12.0(32)S8 available 21-Aug-07
12.0(32)S8; available 21-Aug-07
12.0SY
12.0(32)SY4; available 21-Aug-07
12.0(32)SY4; available 21-Aug-07
12.0SZ
Vulnerable; first fixed in 12.0(32)S8 available 21-Aug-07
12.0T
Not Vulnerable
12.0W
Not Vulnerable
12.0WC
Not Vulnerable
12.0WT
Not Vulnerable
12.0XA
Not Vulnerable
12.0XB
Not Vulnerable
12.0XC
Not Vulnerable
12.0XD
Not Vulnerable
12.0XE
Not Vulnerable
12.0XF
Not Vulnerable
12.0XG
Not Vulnerable
12.0XH
Not Vulnerable
12.0XI
Not Vulnerable
12.0XJ
Not Vulnerable
12.0XK
Not Vulnerable
12.0XL
Not Vulnerable
12.0XM
Not Vulnerable
12.0XN
Not Vulnerable
12.0XQ
Not Vulnerable
12.0XR
Not Vulnerable
12.0XS
Not Vulnerable
12.0XV
Not Vulnerable
12.0XW
Not Vulnerable
Affected 12.1-Based Release
First Fixed Release
Recommended Release
12.1
Not Vulnerable
12.1AA
Not Vulnerable
12.1AX
Not Vulnerable
12.1AY
Not Vulnerable
12.1AZ
Not Vulnerable
12.1CX
Not Vulnerable
12.1DA
Not Vulnerable
12.1DB
Not Vulnerable
12.1DC
Not Vulnerable
12.1E
Not Vulnerable
12.1EA
Not Vulnerable
12.1EB
Not Vulnerable
12.1EC
Not Vulnerable
12.1EO
Not Vulnerable
12.1EU
Not Vulnerable
12.1EV
Not Vulnerable
12.1EW
Not Vulnerable
12.1EX
Not Vulnerable
12.1EY
Not Vulnerable
12.1EZ
Not Vulnerable
12.1GA
Not Vulnerable
12.1GB
Not Vulnerable
12.1T
Not Vulnerable
12.1XA
Not Vulnerable
12.1XB
Not Vulnerable
12.1XC
Not Vulnerable
12.1XD
Not Vulnerable
12.1XE
Not Vulnerable
12.1XF
Not Vulnerable
12.1XG
Not Vulnerable
12.1XH
Not Vulnerable
12.1XI
Not Vulnerable
12.1XJ
Not Vulnerable
12.1XK
Not Vulnerable
12.1XL
Not Vulnerable
12.1XM
Not Vulnerable
12.1XN
Not Vulnerable
12.1XO
Not Vulnerable
12.1XP
Not Vulnerable
12.1XQ
Not Vulnerable
12.1XR
Not Vulnerable
12.1XS
Not Vulnerable
12.1XT
Not Vulnerable
12.1XU
Vulnerable; first fixed in 12.3(15)
12.3(23)
12.3(20a)
12.3(21b)
12.3(22a)
12.3(18a)
12.3(19a); available 16-Aug-07
12.3(17c); available 16-Aug-07
12.1XV
Vulnerable; first fixed in 12.3(15)
12.3(23)
12.3(20a)
12.3(21b)
12.3(22a)
12.3(18a)
12.3(19a); available 16-Aug-07
12.3(17c); available 16-Aug-07
12.1XW
Not Vulnerable
12.1XX
Not Vulnerable
12.1XY
Not Vulnerable
12.1XZ
Not Vulnerable
12.1YA
Not Vulnerable
12.1YB
Vulnerable; first fixed in 12.3(15)
12.3(23)
12.3(20a)
12.3(21b)
12.3(22a)
12.3(18a)
12.3(19a); available 16-Aug-07
12.3(17c); available 16-Aug-07
12.1YC
Vulnerable; first fixed in 12.3(15)
12.3(23)
12.3(20a)
12.3(21b)
12.3(22a)
12.3(18a)
12.3(19a); available 16-Aug-07
12.3(17c); available 16-Aug-07
12.1YD
Vulnerable; first fixed in 12.3(15)
12.3(23)
12.3(20a)
12.3(21b)
12.3(22a)
12.3(18a)
12.3(19a); available 16-Aug-07
12.3(17c); available 16-Aug-07
12.1YE
Not Vulnerable
12.1YF
Not Vulnerable
12.1YG
Not Vulnerable
12.1YH
Not Vulnerable
12.1YI
Not Vulnerable
12.1YJ
Not Vulnerable
Affected 12.2-Based Release
First Fixed Release
Recommended Release
12.2
Not Vulnerable
12.2B
Vulnerable; first fixed in 12.3(14)T
12.4(12c)
12.4(3h)
12.4(5c)
12.4(8d); available 03-Sep-07
12.4(7f)
12.4(16)
12.4(10c)
12.4(13d)
12.2BC
Vulnerable; first fixed in 12.3(17a)BC
12.3(17b)BC8
12.3(21a)BC3
12.2BW
Vulnerable; first fixed in 12.3(15)
12.3(23)
12.3(20a)
12.3(21b)
12.3(22a)
12.3(18a)
12.3(19a); available 16-Aug-07
12.3(17c); available 16-Aug-07
12.2BY
Vulnerable; first fixed in 12.3(14)T
12.4(12c)
12.4(3h)
12.4(5c)
12.4(8d); available 03-Sep-07
12.4(7f)
12.4(16)
12.4(10c)
12.4(13d)
12.2BZ
Not Vulnerable
12.2CX
Vulnerable; first fixed in 12.3(17a)BC
12.3(17b)BC8
12.3(21a)BC3
12.2CY
Not Vulnerable
12.2CZ
Not Vulnerable
12.2DA
Not Vulnerable
12.2DD
Vulnerable; first fixed in 12.3(14)T
12.4(12c)
12.4(3h)
12.4(5c)
12.4(8d); available 03-Sep-07
12.4(7f)
12.4(16)
12.4(10c)
12.4(13d)
12.2DX
Vulnerable; first fixed in 12.3(14)T
12.4(12c)
12.4(3h)
12.4(5c)
12.4(8d); available 03-Sep-07
12.4(7f)
12.4(16)
12.4(10c)
12.4(13d)
12.2EU
Vulnerable; first fixed in 12.2(25)EWA10
All Cat4K platforms:
12.2(25)EWA10
12.2(31)SGA3
12.2(37)SG1
12.2(40)SG; available Oct-07
12.2EW
Vulnerable; first fixed in 12.2(25)EWA10
All Cat4K platforms:
12.2(25)EWA10
12.2(31)SGA3
12.2(37)SG1
12.2(40)SG; available Oct-07
12.2EWA
12.2(25)EWA10
All Cat4K platforms:
12.2(25)EWA10
12.2(31)SGA3
12.2(37)SG1
12.2(40)SG; available Oct-07
12.2EX
Not Vulnerable
12.2EY
Not Vulnerable
12.2EZ
Vulnerable; first fixed in 12.2(25)SEE4
12.2(25)SEE4; available 07-Aug-07
12.2FX
Not Vulnerable
12.2FY
Not Vulnerable
12.2FZ
Vulnerable; first fixed in 12.2(35)SE
12.2(40)SE; available 24-Aug-07
12.2(37)SE1
12.2(35)SE5
12.2IXA
Not Vulnerable
12.2IXB
Not Vulnerable
12.2IXC
Not Vulnerable
12.2IXD
Not Vulnerable
12.2JA
Not Vulnerable
12.2JK
Not Vulnerable
12.2MB
Not Vulnerable
12.2MC
12.2(15)MC2h
12.2(15)MC2j
12.2(15)MC2j
12.2S
12.2(14)S18
12.2(18)S13
12.2(20)S14
12.2(25)S13
12.2(30)S
12.2(25)S13
12.2(14)S19
12.2SB
Not Vulnerable
12.2SBC
Not Vulnerable
12.2SE
Not Vulnerable
12.2SEA
Vulnerable; first fixed in 12.2(25)SEE4
12.2(25)SEE4; available 07-Aug-07
12.2SEB
Vulnerable; first fixed in 12.2(25)SEE4
12.2(25)SEE4; available 07-Aug-07
12.2SEC
Vulnerable; first fixed in 12.2(25)SEE4
12.2(25)SEE4; available 07-Aug-07
12.2SED
Vulnerable; first fixed in 12.2(25)SEE4
12.2(25)SEE4; available 07-Aug-07
12.2SEE
12.2(25)SEE4
12.2(25)SEE4
12.2SEF
Not Vulnerable
12.2SEG
12.2(25)SEG3
12.2(25)SEG3
12.2SG
12.2(25)SG2; available 13-Aug-07
12.2(31)SG1
12.2(31)SG
12.2(37)SG
12.2(40)SG; available 24-Oct-07
All Cat4K platforms:
12.2(25)SG2
12.2(37)SG1
12.2(31)SG2
12.2(40)SG; available Oct-07
12.2SGA
Not Vulnerable
12.2SL
Not Vulnerable
12.2SM
Not Vulnerable
12.2SO
Not Vulnerable
12.2SRA
Not Vulnerable
12.2SRB
Not Vulnerable
12.2SU
Vulnerable; first fixed in 12.3(14)T
12.4(12c)
12.4(3h)
12.4(5c)
12.4(8d); available 03-Sep-07
12.4(7f)
12.4(16)
12.4(10c)
12.4(13d)
12.2SV
12.2(27)SV2
12.2(27)SV3
12.2(27)SV1
12.2(28)SV1
12.2(29)SV
12.2(29a)SV
12.2(29b)SV
12.2(29)SV4; available 14-Oct-07
12.2SVA
Not Vulnerable
12.2SVC
Not Vulnerable
12.2SW
12.2(25)SW11
12.2(25)SW11
12.2SX
Vulnerable; first fixed in 12.2(18)SXE
12.2SXA
Vulnerable; first fixed in 12.2(18)SXE
12.2SXB
Vulnerable; first fixed in 12.2(18)SXE
12.2(18)SXF10
12.2SXD
Vulnerable; contact TAC
12.2SXE
Not Vulnerable
12.2SXF
Not Vulnerable
12.2SXH
Not Vulnerable
12.2SY
Vulnerable; first fixed in 12.2(18)SXE
12.2SZ
Vulnerable; first fixed in 12.2(30)S
12.2(25)S13
12.2(14)S19
12.2T
Vulnerable; first fixed in 12.3(15)
12.3(23)
12.3(20a)
12.3(21b)
12.3(22a)
12.3(18a)
12.3(19a); available 16-Aug-07
12.3(17c); available 16-Aug-07
12.2TPC
12.2(8)TPC10c; available 17-Aug-07
12.2(8)TPC10c
12.2UZ
Not Vulnerable
12.2VZ
Not Vulnerable
12.2XA
Vulnerable; first fixed in 12.3(15)
12.3(23)
12.3(20a)
12.3(21b)
12.3(22a)
12.3(18a)
12.3(19a); available 16-Aug-07
12.3(17c); available 16-Aug-07
12.2XB
Vulnerable; first fixed in 12.3(15)
12.3(23)
12.3(20a)
12.3(21b)
12.3(22a)
12.3(18a)
12.3(19a); available 16-Aug-07
12.3(17c); available 16-Aug-07
12.2XC
Vulnerable; first fixed in 12.3(14)T
12.4(12c)
12.4(3h)
12.4(5c)
12.4(8d); available 03-Sep-07
12.4(7f)
12.4(16)
12.4(10c)
12.4(13d)
12.2XD
Vulnerable; first fixed in 12.3(15)
12.3(23)
12.3(20a)
12.3(21b)
12.3(22a)
12.3(18a)
12.3(19a); available 16-Aug-07
12.3(17c); available 16-Aug-07
12.2XE
Not Vulnerable
12.2XF
Vulnerable; first fixed in 12.3(17a)BC
12.3(17b)BC8
12.3(21a)BC3
12.2XG
Vulnerable; first fixed in 12.3(15)
12.3(23)
12.3(20a)
12.3(21b)
12.3(22a)
12.3(18a)
12.3(19a); available 16-Aug-07
12.3(17c); available 16-Aug-07
12.2XH
Vulnerable; first fixed in 12.3(15)
12.3(23)
12.3(20a)
12.3(21b)
12.3(22a)
12.3(18a)
12.3(19a); available 16-Aug-07
12.3(17c); available 16-Aug-07
12.2XI
Vulnerable; first fixed in 12.3(15)
12.3(23)
12.3(20a)
12.3(21b)
12.3(22a)
12.3(18a)
12.3(19a); available 16-Aug-07
12.3(17c); available 16-Aug-07
12.2XJ
Vulnerable; first fixed in 12.3(15)
12.3(23)
12.3(20a)
12.3(21b)
12.3(22a)
12.3(18a)
12.3(19a); available 16-Aug-07
12.3(17c); available 16-Aug-07
12.2XK
Vulnerable; first fixed in 12.3(15)
12.3(23)
12.3(20a)
12.3(21b)
12.3(22a)
12.3(18a)
12.3(19a); available 16-Aug-07
12.3(17c); available 16-Aug-07
12.2XL
Vulnerable; first fixed in 12.3(15)
12.3(23)
12.3(20a)
12.3(21b)
12.3(22a)
12.3(18a)
12.3(19a); available 16-Aug-07
12.3(17c); available 16-Aug-07
12.2XM
Vulnerable; first fixed in 12.3(15)
12.3(23)
12.3(20a)
12.3(21b)
12.3(22a)
12.3(18a)
12.3(19a); available 16-Aug-07
12.3(17c); available 16-Aug-07
12.2XN
Vulnerable; first fixed in 12.3(15)
12.3(23)
12.3(20a)
12.3(21b)
12.3(22a)
12.3(18a)
12.3(19a); available 16-Aug-07
12.3(17c); available 16-Aug-07
12.2XQ
Vulnerable; first fixed in 12.3(15)
12.3(23)
12.3(20a)
12.3(21b)
12.3(22a)
12.3(18a)
12.3(19a); available 16-Aug-07
12.3(17c); available 16-Aug-07
12.2XR
Not Vulnerable
12.2XS
Not Vulnerable
12.2XT
Vulnerable; first fixed in 12.3(15)
12.3(23)
12.3(20a)
12.3(21b)
12.3(22a)
12.3(18a)
12.3(19a); available 16-Aug-07
12.3(17c); available 16-Aug-07
12.2XU
Vulnerable; first fixed in 12.3(15)
12.3(23)
12.3(20a)
12.3(21b)
12.3(22a)
12.3(18a)
12.3(19a); available 16-Aug-07
12.3(17c); available 16-Aug-07
12.2XV
Vulnerable; first fixed in 12.3(15)
12.3(23)
12.3(20a)
12.3(21b)
12.3(22a)
12.3(18a)
12.3(19a); available 16-Aug-07
12.3(17c); available 16-Aug-07
12.2XW
Vulnerable; first fixed in 12.3(15)
12.3(23)
12.3(20a)
12.3(21b)
12.3(22a)
12.3(18a)
12.3(19a); available 16-Aug-07
12.3(17c); available 16-Aug-07
12.2YA
Vulnerable; first fixed in 12.3(15)
12.3(23)
12.3(20a)
12.3(21b)
12.3(22a)
12.3(18a)
12.3(19a); available 16-Aug-07
12.3(17c); available 16-Aug-07
12.2YB
Vulnerable; first fixed in 12.3(15)
12.3(23)
12.3(20a)
12.3(21b)
12.3(22a)
12.3(18a)
12.3(19a); available 16-Aug-07
12.3(17c); available 16-Aug-07
12.2YC
Not Vulnerable
12.2YD
Vulnerable; first fixed in 12.3(14)T
12.4(12c)
12.4(3h)
12.4(5c)
12.4(8d); available 03-Sep-07
12.4(7f)
12.4(16)
12.4(10c)
12.4(13d)
12.2YE
Vulnerable; first fixed in 12.2(30)S
12.2(25)S13
12.2(14)S19
12.2YF
Vulnerable; first fixed in 12.3(15)
12.3(23)
12.3(20a)
12.3(21b)
12.3(22a)
12.3(18a)
12.3(19a); available 16-Aug-07
12.3(17c); available 16-Aug-07
12.2YG
Not Vulnerable
12.2YH
Vulnerable; first fixed in 12.3(15)
12.3(23)
12.3(20a)
12.3(21b)
12.3(22a)
12.3(18a)
12.3(19a); available 16-Aug-07
12.3(17c); available 16-Aug-07
12.2YJ
Vulnerable; first fixed in 12.3(15)
12.3(23)
12.3(20a)
12.3(21b)
12.3(22a)
12.3(18a)
12.3(19a); available 16-Aug-07
12.3(17c); available 16-Aug-07
12.2YK
Not Vulnerable
12.2YL
Vulnerable; first fixed in 12.3(14)T
12.4(12c)
12.4(3h)
12.4(5c)
12.4(8d); available 03-Sep-07
12.4(7f)
12.4(16)
12.4(10c)
12.4(13d)
12.2YM
Vulnerable; first fixed in 12.3(14)T
12.4(12c)
12.4(3h)
12.4(5c)
12.4(8d); available 03-Sep-07
12.4(7f)
12.4(16)
12.4(10c)
12.4(13d)
12.2YN
Vulnerable; first fixed in 12.3(14)T
12.4(12c)
12.4(3h)
12.4(5c)
12.4(8d); available 03-Sep-07
12.4(7f)
12.4(16)
12.4(10c)
12.4(13d)
12.2YO
Not Vulnerable
12.2YP
Not Vulnerable
12.2YQ
Vulnerable; first fixed in 12.3(14)T
12.4(12c)
12.4(3h)
12.4(5c)
12.4(8d); available 03-Sep-07
12.4(7f)
12.4(16)
12.4(10c)
12.4(13d)
12.2YR
Vulnerable; first fixed in 12.3(14)T
12.4(12c)
12.4(3h)
12.4(5c)
12.4(8d); available 03-Sep-07
12.4(7f)
12.4(16)
12.4(10c)
12.4(13d)
12.2YS
Not Vulnerable
12.2YT
Vulnerable; first fixed in 12.3(15)
12.3(23)
12.3(20a)
12.3(21b)
12.3(22a)
12.3(18a)
12.3(19a); available 16-Aug-07
12.3(17c); available 16-Aug-07
12.2YU
Vulnerable; first fixed in 12.3(14)T
12.4(12c)
12.4(3h)
12.4(5c)
12.4(8d); available 03-Sep-07
12.4(7f)
12.4(16)
12.4(10c)
12.4(13d)
12.2YV
Vulnerable; first fixed in 12.3(14)T
12.4(12c)
12.4(3h)
12.4(5c)
12.4(8d); available 03-Sep-07
12.4(7f)
12.4(16)
12.4(10c)
12.4(13d)
12.2YW
Vulnerable; first fixed in 12.3(14)T
12.4(12c)
12.4(3h)
12.4(5c)
12.4(8d); available 03-Sep-07
12.4(7f)
12.4(16)
12.4(10c)
12.4(13d)
12.2YX
Vulnerable; first fixed in 12.3(14)T
12.4(12c)
12.4(3h)
12.4(5c)
12.4(8d); available 03-Sep-07
12.4(7f)
12.4(16)
12.4(10c)
12.4(13d)
12.2YY
Vulnerable; first fixed in 12.3(14)T
12.4(12c)
12.4(3h)
12.4(5c)
12.4(8d); available 03-Sep-07
12.4(7f)
12.4(16)
12.4(10c)
12.4(13d)
12.2YZ
Vulnerable; first fixed in 12.2(30)S
12.2(25)S13
12.2(14)S19
12.2ZA
Vulnerable; first fixed in 12.2(18)SXE
12.2ZB
Vulnerable; first fixed in 12.3(14)T
12.4(12c)
12.4(3h)
12.4(5c)
12.4(8d); available 03-Sep-07
12.4(7f)
12.4(16)
12.4(10c)
12.4(13d)
12.2ZC
Not Vulnerable
12.2ZD
Vulnerable; contact TAC
12.2ZE
Vulnerable; first fixed in 12.3(15)
12.3(23)
12.3(20a)
12.3(21b)
12.3(22a)
12.3(18a)
12.3(19a); available 16-Aug-07
12.3(17c); available 16-Aug-07
12.2ZF
Vulnerable; first fixed in 12.3(14)T
12.4(12c)
12.4(3h)
12.4(5c)
12.4(8d); available 03-Sep-07
12.4(7f)
12.4(16)
12.4(10c)
12.4(13d)
12.2ZG
Not Vulnerable
12.2ZH
12.2(13)ZH9; available 17-Aug-07
12.2(13)ZH9
12.2ZJ
Vulnerable; first fixed in 12.3(14)T
12.4(12c)
12.4(3h)
12.4(5c)
12.4(8d); available 03-Sep-07
12.4(7f)
12.4(16)
12.4(10c)
12.4(13d)
12.2ZL
Vulnerable, first fixed in 12.3(14)T for the Cisco 17xx;
first fixed in 12.4(1) for the Cisco 3200;
first fixed in 12.3(7)XR7, available 13-Aug-07 for the ICS7750
12.2ZP
Not Vulnerable
12.2ZR
Vulnerable; contact TAC
12.2ZU
Not Vulnerable
12.2ZW
Not Vulnerable
12.2ZY
Not Vulnerable
Affected 12.3-Based Release
First Fixed Release
Recommended Release
12.3
12.3(15)
12.3(16)
12.3(17a)
12.3(18)
12.3(19)
12.3(20)
12.3(21)
12.3(22)
12.3(23)
12.3(23)
12.3(20a)
12.3(21b)
12.3(22a)
12.3(18a)
12.3(19a); available 16-Aug-07
12.3(17c); available 16-Aug-07
12.3B
Vulnerable; first fixed in 12.3(14)T
12.4(12c)
12.4(3h)
12.4(5c)
12.4(8d); available 03-Sep-07
12.4(7f)
12.4(16)
12.4(10c)
12.4(13d)
12.3BC
12.3(17a)BC
12.3(21)BC
12.3(17b)BC8
12.3(21a)BC3
12.3BW
Vulnerable; first fixed in 12.3(14)T
12.4(12c)
12.4(3h)
12.4(5c)
12.4(8d); available 03-Sep-07
12.4(7f)
12.4(16)
12.4(10c)
12.4(13d)
12.3JA
Not Vulnerable
12.3JEA
Not Vulnerable
12.3JEB
Not Vulnerable
12.3JK
Not Vulnerable
12.3JL
Not Vulnerable
12.3JX
Not Vulnerable
12.3T
Limited platform support is available
12.3(11)T12; available 16-Aug-07
12.3(14)T
12.4(12c)
12.4(3h)
12.4(5c)
12.4(8d); available 03-Sep-07
12.4(7f)
12.4(16)
12.4(10c)
12.4(13d)
12.3TPC
Not Vulnerable
12.3VA
Not Vulnerable
12.3XA
12.3(2)XA6
12.3(2)XA6
12.3XB
Vulnerable; first fixed in 12.3(14)T
12.4(12c)
12.4(3h)
12.4(5c)
12.4(8d); available 03-Sep-07
12.4(7f)
12.4(16)
12.4(10c)
12.4(13d)
12.3XC
12.3(2)XC5
12.3(2)XC5
12.3XD
Vulnerable; first fixed in 12.3(14)T
12.4(12c)
12.4(3h)
12.4(5c)
12.4(8d); available 03-Sep-07
12.4(7f)
12.4(16)
12.4(10c)
12.4(13d)
12.3XE
12.3(2)XE5; available 17-Aug-07
12.3(2)XE5
12.3XF
Vulnerable; first fixed in 12.3(14)T
12.4(12c)
12.4(3h)
12.4(5c)
12.4(8d); available 03-Sep-07
12.4(7f)
12.4(16)
12.4(10c)
12.4(13d)
12.3XG
Vulnerable; contact TAC
12.4(12c)
12.4(3h)
12.4(5c)
12.4(8d); available 03-Sep-07
12.4(7f)
12.4(16)
12.4(10c)
12.4(13d)
12.3XH
Vulnerable; first fixed in 12.3(14)T
12.4(12c)
12.4(3h)
12.4(5c)
12.4(8d); available 03-Sep-07
12.4(7f)
12.4(16)
12.4(10c)
12.4(13d)
12.3XI
12.3(7)XI10a; available 21-Aug-07
12.3(7)XI10a; available 21-Aug-07
12.3XJ
Vulnerable; first fixed in 12.3(14)YX
12.3(14)YX9; available 13-Aug-07
12.3XK
Vulnerable; first fixed in 12.3(14)T
12.4(12c)
12.4(3h)
12.4(5c)
12.4(8d); available 03-Sep-07
12.4(7f)
12.4(16)
12.4(10c)
12.4(13d)
12.3XQ
Vulnerable; first fixed in 12.4(1)
12.4(12c)
12.4(3h)
12.4(5c)
12.4(8d); available 03-Sep-07
12.4(7f)
12.4(16)
12.4(10c)
12.4(13d)
12.3XR
12.3(7)XR7; available 17-Aug-07
12.3(7)XR7; available 17-Aug-07
12.3XS
Vulnerable; first fixed in 12.4(1)
12.4(12c)
12.4(3h)
12.4(5c)
12.4(8d); available 03-Sep-07
12.4(7f)
12.4(16)
12.4(10c)
12.4(13d)
12.3XU
Vulnerable; first fixed in 12.4(2)T
12.4(11)T3
12.4(9)T5; available 24-Aug-07
12.4(2)T6; available 20-Aug-07
12.4(4)T8; available 28-Aug-07
12.4(6)T8
12.4(15)T1
12.3XW
Vulnerable; first fixed in 12.3(14)YX
12.3(14)YX9; available 13-Aug-07
12.3XY
Not Vulnerable
12.3YA
Vulnerable; first fixed in 12.4(1)
12.4(12c)
12.4(3h)
12.4(5c)
12.4(8d); available 03-Sep-07
12.4(7f)
12.4(16)
12.4(10c)
12.4(13d)
12.3(8)YG6; available 16-Aug-07
12.3YD
Vulnerable; first fixed in 12.4(2)T
12.4(11)T3
12.4(9)T5; available 24-Aug-07
12.4(2)T6; available 20-Aug-07
12.4(4)T8; available 28-Aug-07
12.4(6)T8
12.4(15)T1
12.3YF
Vulnerable; first fixed in 12.3(14)YX
12.3(14)YX9; available 13-Aug-07
12.3YG
12.3(8)YG6; available 16-Aug-07
12.3(8)YG6; available 16-Aug-07
12.3YH
Vulnerable; first fixed in 12.4(2)T
12.4(11)T3
12.4(9)T5; available 24-Aug-07
12.4(2)T6; available 20-Aug-07
12.4(4)T8; available 28-Aug-07
12.4(6)T8
12.4(15)T1
12.3YI
Vulnerable; first fixed in 12.4(2)T
12.4(11)T3
12.4(9)T5; available 24-Aug-07
12.4(2)T6; available 20-Aug-07
12.4(4)T8; available 28-Aug-07
12.4(6)T8
12.4(15)T1
12.3YJ
Vulnerable; first fixed in 12.3(14)YQ
12.4(11)T3
12.4(9)T5; available 24-Aug-07
12.4(2)T6; available 20-Aug-07
12.4(4)T8; available 28-Aug-07
12.4(6)T8
12.4(15)T1
12.3YK
12.3(11)YK3; available 20-Aug-07
12.3(11)YK3; available 20-Aug-07
12.3YM
Not Vulnerable
12.3YQ
Not Vulnerable
12.3YS
Not Vulnerable
12.3YT
Not Vulnerable
12.3YU
Not Vulnerable
12.3YX
Not Vulnerable
12.3YZ
12.3(11)YZ2; available 17-Aug-07
12.3(11)YZ2; available 17-Aug-07
Affected 12.4-Based Release
First Fixed Release
Recommended Release
There are no affected 12.4 based releases
Cisco IOS XR
The following table lists fixed Cisco IOS XR software.
Cisco IOS XR Version
SMU ID
SMU Name
3.2.3
AA01920
hfr-base-3.2.3.CSCsi74127
3.2.4
AA01919
hfr-base-3.2.4.CSCsi74127
3.2.6
AA01918
hfr-base-3.2.6.CSCsi74127
3.3.0
AA01917
hfr-base-3.3.0.CSCsi74127
3.3.1
AA01916
hfr-base-3.3.1.CSCsi74127
3.3.2
AA01915
hfr-base-3.3.2.CSCsi74127
3.3.3
AA01914
hfr-base-3.3.3.CSCsi74127
3.3.4
AA01913
hfr-base-3.3.4.CSCsi74127
3.4.0
AA01912
hfr-base-3.4.0.CSCsi74127
3.4.1
AA01911
hfr-base-3.4.1.CSCsi74127
3.4.2
AA02124
hfr-base-3.4.2.CSCsi74127
3.3.1
AA01910
c12k-base-3.3.1.CSCsi74127
3.4.0
AA01909
c12k-base-3.4.0.CSCsi74127
3.4.1
AA01908
c12k-base-3.4.1.CSCsi74127
IOS XR Package Installation Envelopes (PIE) can be downloaded from File Exchange at: https://upload.cisco.com/cgi-bin/swc/fileexg/main.cgi?CONTYPES=IOS-XR ( registered customers only) . Installation instructions are included in the accompanying .txt files.
-
The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability described in this advisory.
This vulnerability was initially rectified internally within Cisco during hardening IPv6 protocol. It was subsequently re-discovered and reported by Tom Cross from IBM Internet Security Systems X-Force.
-
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.
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Show Less
Revision 1.1
2007-August-09
Added fix information for IOS XR v3.4.2 running on CRS-1.
Revision 1.0
2007-August-08
Initial public release.
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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 is an uncontrolled copy, and may lack important information or contain factual errors. The information in this document is intended for end-users of Cisco products.