TITLE:
Cisco VPN 3000 Concentrator HTTP Packet Denial of Service

SECUNIA ADVISORY ID:
SA18629

VERIFY ADVISORY:
http://secunia.com/advisories/18629/

CRITICAL:
Moderately critical

IMPACT:
DoS

WHERE:
>From remote

OPERATING SYSTEM:
Cisco VPN 3000 Concentrator
http://secunia.com/product/90/

DESCRIPTION:
A vulnerability has been reported in Cisco VPN 3000 Concentrator,
which can be exploited by malicious people to cause a DoS (Denial of
Service).

The vulnerability is caused due to an error when processing HTTP
packets. This can be exploited to cause the network device to reload
or drop established user connections by sending a specially crafted
HTTP packet to the concentrator.

Successful exploitation requires that the HTTP service is enabled
(default setting).

The vulnerability has been reported in software versions 4.7.0
through 4.7.2.A (including version 4.7REL). Software versions prior
to 4.7.x are not affected.

SOLUTION:
Update to software version 4.7.2.B or later.
http://www.cisco.com/pcgi-bin/tablebuild.pl/vpn3000-3des

Disable the HTTP service.

PROVIDED AND/OR DISCOVERED BY:
Discussed at the Schmoocon security conference.

ORIGINAL ADVISORY:
http://www.cisco.com/warp/public/707/cisco-sa-20060126-vpn.shtml

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