Cisco Firewall Services Module SIP DoS and ACL Corruption
Secunia Advisory: SA24180Release Date: 2007-02-15
Critical: Moderately critical
Impact: DoS
Where: From remote
Solution Status: Vendor Patch
Software: Cisco Firewall Services Module (FWSM) 2.x
Description:
A vulnerability and a security issue have been reported in Cisco Firewall Services Module, which can be exploited by malicious people to cause a DoS (Denial of Service) or bypass certain security restrictions.
1) An unspecified error exists when inspecting malformed SIP packets. This can be exploited to cause the device to reload by sending specially crafted SIP packets.
Successful exploitation requires that "SIP fixup" is enabled, which is the default setting.
2) 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.
Solution:
Update to version 2.3(4.12) or 3.1(3.24)
Provided and/or discovered by:
Reported by the vendor.
Original Advisory:
http://www.cisco.com/warp/public/707/cisco-sa-20070214-fwsm.shtml
Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.
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