OSEC

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[SA28472] Cisco VPN Client IPSec Driver Local Denial of Service

From: Secunia Security Advisories (sec-advsecunia.com)
Date: Thu Jan 17 2008 - 18:07:04 CST

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TITLE:
Cisco VPN Client IPSec Driver Local Denial of Service

SECUNIA ADVISORY ID:
SA28472

VERIFY ADVISORY:
http://secunia.com/advisories/28472/

CRITICAL:
Not critical

IMPACT:
DoS

WHERE:
Local system

SOFTWARE:
Cisco VPN Client 5.x
http://secunia.com/product/14325/

DESCRIPTION:
mu-b has reported a vulnerability in Cisco VPN Client, which can be
exploited by malicious, local users to cause a DoS (Denial of
Service).

The vulnerability is caused due to an error when handling certain
IOCTLs sent to the IPSec driver (CVPNDRVA.sys). This can be exploited
to cause a memory corruption within kernel space by sending specially
crafted IOCTLs to the affected driver, resulting in a system crash.

The vulnerability is reported in CVPNDRVA.sys version 5.0.02.0090.
Other versions may also be affected.

SOLUTION:
Restrict access to trusted users.

PROVIDED AND/OR DISCOVERED BY:
mu-b, Digit-Labs

ORIGINAL ADVISORY:
http://milw0rm.com/exploits/4911

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