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TITLE:
Cisco Firewall Services Module SIP DoS and ACL Corruption

SECUNIA ADVISORY ID:
SA24180

VERIFY ADVISORY:
http://secunia.com/advisories/24180/

CRITICAL:
Moderately critical

IMPACT:
DoS

WHERE:
>From remote

SOFTWARE:
Cisco Firewall Services Module (FWSM) 2.x
http://secunia.com/product/5088/

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

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

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Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


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Secunia NEVER sends attached files with advisories.
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use those supplied by the vendor.

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