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TITLE:
Cisco FWSM HTTPS/MGCP Packet Processing Denial of Service

SECUNIA ADVISORY ID:
SA27236

VERIFY ADVISORY:
http://secunia.com/advisories/27236/

CRITICAL:
Moderately critical

IMPACT:
DoS

WHERE:
>From remote

SOFTWARE:
Cisco Firewall Services Module (FWSM) 3.x
http://secunia.com/product/8614/

DESCRIPTION:
Cisco has acknowledged some vulnerabilities in Cisco Firewall
Services Module (FWSM), which can be exploited by malicious people to
cause a DoS (Denial of Service).

1) An unspecified error exists within the handling of HTTPS packets.
This can be exploited to reboot an affected FWSM by sending specially
crafted HTTPS packets.

Successful exploitation requires that the HTTPS server is enabled
(disabled by default).

The vulnerability is reported in versions 3.1 and 3.2.

2) An unspecified error exists within the handling of Media Gateway
Control Protocol (MGCP) packets. This can be exploited to reboot the
FWSM by sending specially crafted MGCP packets.

Successful exploitation requires that the MGCP application layer
protocol inspection is enabled (disabled by default).

The vulnerability is reported in version 3.1.

NOTE: An error when loading manipulated ACLs (Access Control Lists)
is also reported.

SOLUTION:
Update to a fixed version (please see vendor's advisory for details).

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

ORIGINAL ADVISORY:
http://www.cisco.com/warp/public/707/cisco-sa-20071017-fwsm.shtml

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