Some vulnerabilities and a security issue have been reported in Cisco Firewall Services, which can be exploited by malicious people to cause a DoS or bypass certain security restrictions.

1) An unspecified error within the enhanced inspection of HTTP traffic can be exploited to cause the device to reload via specially crafted HTTP traffic.

Successful exploitation requires that enhanced inspection is enabled.

2) An error within the inspection of SIP packets can be exploited to cause the device to reload via specially crafted SIP packets.

Successful exploitation requires that SIP inspection is enabled.

3) An unspecified error when processing malformed HTTPS requests can be exploited to cause the device to reload by sending specially crafted HTTPS requests.

Successful exploitation requires that "authentication for network access" (auth-proxy) is enabled.

4) An error when processing HTTP requests with a very long URL can be exploited to cause the device to reload, but requires that "authentication for network access" (auth-proxy) is enabled.

5) An unspecified error exists when processing HTTPS traffic that is directed to the FWSM. This can be exploited to cause the device to reload by sending specially crafted HTTPS requests, but requires that the HTTPS server is enabled.

6) An unspecified error when processing malformed SNMP requests from a trusted device can be exploited to cause the affected device to reload.

Successful exploitation requires that the other, trusted device has explicit SNMP poll access.

7) A security issue when manipulating ACLs (Access Control Lists) that make use of object groups can corrupt ACLs, resulting in ACEs (Access Control Entries) being skipped or not evaluated in order, which can be exploited to bypass certain security restrictions.

Note: Only an administrative user can change ACLs. Additionally, this does not affected devices which are reloaded after ACLs have been manipulated.

A vulnerability that could cause the device to reload when "debugging" is enabled has also been reported.

Solution
Apply updated software. Please see vendor advisory for a patch matrix.

Provided and/or discovered by
Reported by the vendor.

Changelog
Further details available to Secunia VIM customers

Original Advisory
http://www.cisco.com/warp/public/707/cisco-sa-20070214-fwsm.shtml

Deep Links
Links available to Secunia VIM customers