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TITLE:
Cisco Firewall Services Module ICMP Message Denial of Service

SECUNIA ADVISORY ID:
SA36373

VERIFY ADVISORY:
http://secunia.com/advisories/36373/

DESCRIPTION:
A vulnerability has been reported in Cisco Firewall Services Module
(FWSM), which can be exploited by malicious people to cause a DoS
(Denial of Service).

The vulnerability is caused due to an error in one of the NPs
(Network Processors) when handling certain ICMP traffic, which may
result in all available execution threads being exhausted. This can
be exploited via multiple specially crafted ICMP messages to cause
the module to stop forwarding traffic and stop accepting management
traffic until reloaded.

SOLUTION:
Update to version 3.1(16), 3.2(13), or 4.0(6).

Users of version 2.x should migrate to either 3.x or 4.x.

PROVIDED AND/OR DISCOVERED BY:
Reported by the vendor.

ORIGINAL ADVISORY:
cisco-sa-20090819-fwsm:
http://www.cisco.com/en/US/products/products_security_advisory09186a0080af0d1d.shtml

OTHER REFERENCES:
Cisco Applied Mitigation Bulletin:
http://www.cisco.com/en/US/products/products_applied_mitigation_bulletin09186a0080af151c.html

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