AV:N/AC:L/Au:N/C:N/I:N/A:C/E:F/RL:OF/RC:C
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Cisco Firewall Services Module (FWSM) Software for Cisco Catalyst 6500 Series Switches and Cisco 7600 Series Routers is affected by the following vulnerabilities:
- FWSM HTTP Proxy Traceback Vulnerability
- IKE Version 1 Denial of Service Vulnerability
Successful exploitation of either of these vulnerabilities may result in a reload of an affected device, leading to a denial of service (DoS) condition.
Cisco has released software updates that address these vulnerabilities. A workaround is available for the IKE vulnerability.
This advisory is available at the following link:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130410-fwsm
Note: The Cisco Adaptive Security Appliance (ASA) may be affected by some of the vulnerabilities listed above. A separate Cisco Security Advisory has been published to disclose the vulnerabilities that affect the Cisco ASA. That advisory is available at:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130410-asa
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Cisco Firewall Service Module Software for Cisco Catalyst 6500 Series Switches and Cisco 7600 Series Routers is affected by multiple vulnerabilities. Affected versions of Cisco FWSM Software will vary depending on the specific vulnerability. Consult the "Software Versions and Fixes" section of this security advisory for more information about the affected versions.
Vulnerable Products
FWSM HTTP Proxy Traceback Vulnerability
A Cisco FWSM is affected by this vulnerability when running an affected version of Cisco FWSM Software with the auth-proxy feature configured. The auth-proxy feature is not enabled by default. See the "Details" section for information on determining whether a device has a vulnerable configuration.
IKE Version 1 Denial of Service Vulnerability
A Cisco FWSM is affected by this vulnerability if IKE version 1 is enabled. IKE is not enabled by default. See the "Details" section for information on determining whether a device has a vulnerable configuration.
Note: IKE on the FWSM is supported only for remote administration, not for remote network access.Products Confirmed Not Vulnerable
With the exception of Cisco ASA software, no other Cisco products are currently known to be affected by these vulnerabilities.
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FWSM HTTP Proxy Traceback Vulnerability
The auth-proxy feature in Cisco Firewall Services Module (FWSM) Software contains a vulnerability that could allow an unauthenticated, remote attacker to cause a reload of an affected device.
The vulnerability is due to incorrect processing of URLs when clients are making requests through the auth-proxy feature. A Cisco FWSM is affected by this vulnerability when running an affected version of Cisco FWSM Software with the auth-proxy feature configured. The auth-proxy feature is enabled if the configuration contains one or more of the the following commands:aaa authentication {include | exclude} service interface_name inside_ip inside_mask [outside_ip outside_mask] {server_tag | LOCAL}
or
aaa authentication match acl_name interface_name {server_tag | LOCAL}
The auth-proxy feature is not enabled by default. See the Cisco FWSM configuration guide for more examples http://www.cisco.com/en/US/docs/security/fwsm/fwsm31/configuration/guide/fwaaa_f.html
This vulnerability is described in Cisco bug ID CSCtg02624 (registered customers only) and has been assigned CVE ID CVE-2013-1155.
IKE Version 1 Denial of Service Vulnerability
Note: IKE on the Cisco FWSM is supported only for remote administration, not for remote network access.
A Cisco FWSM is affected by this vulnerability if IKE version 1 is enabled. IKE version 1 is enabled if the command isakmp enable <interface name> is configured
IKE is not enabled by default.
This vulnerability is described in Cisco bug ID CSCud20267 (registered customers only) and has been assigned CVE ID CVE-2013-1149.
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Administrators can mitigate the IKE Version 1 Denial of Service Vulnerability by disabling VPN access for administration and instead using SSH or HTTPS for administration.
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When considering software upgrades, customers are advised to consult the Cisco Security Advisories, Responses, and Notices archive at http://www.cisco.com/go/psirt and review subsequent advisories to determine exposure and a complete upgrade solution.
In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.
The following table lists fixed and recommended versions to remediate the FWSM HTTP Proxy Traceback Vulnerability:Major Release
First Fixed Release
Recommended Release
3.1 Affected; Migrate to 3.2
Migrate to 3.2
3.2 3.2(20.1) 3.2(25)
4.0 4.0(15.2)
Migrate to 4.1
4.1 4.1(5.1) 4.1(12)
The following table lists fixed and recommended versions to remediate the IKE Version 1 Denial of Service Vulnerability:
Major Release
First Fixed Release
Recommended Release
3.1 Affected; Migrate to 3.2
Migrate to 3.2
3.2 3.2(24.1) 3.2(25)
4.0 Affected; Migrate to 4.1
Migrate to 4.1
4.1 4.1(11.1)
4.1(12)
Software Download
Cisco FWSM Software can be downloaded from the Software Center on Cisco.com by visiting http://www.cisco.com/cisco/software/navigator.html
For the Cisco Catalyst 6500 Series Firewall Services Module, navigate to Products > Security > Firewalls > Firewall Integrated Switch/Router Services >Cisco Catalyst 6500 Series Firewall Services Module > Firewall Services Module (FWSM) Software.
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The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory.
These vulnerabilities were discovered during troubleshooting of customer issues.
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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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Revision 1.0 2013-April-10 Initial public release
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