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TITLE:
Sophos Anti-Virus "NtCreateKey()" Hooked Function Denial of Service

SECUNIA ADVISORY ID:
SA29996

VERIFY ADVISORY:
http://secunia.com/advisories/29996/

CRITICAL:
Not critical

IMPACT:
DoS

WHERE:
Local system

SOFTWARE:
Sophos Anti-Virus 7.x
http://secunia.com/product/15621/

DESCRIPTION:
Core Security Technologies has reported a vulnerability in Sophos
Anti-Virus, which can be exploited by malicious, local users to cause
a DoS (Denial of Service).

The vulnerability is caused due to an input validation error when
handling arguments passed to the hooked SSDT function
"NtCreateKey()". This can be exploited to cause a DoS by calling the
affected function with specially crafted arguments.

Successful exploitation requires that the "Block suspicious behavior"
detection is enabled.

The vulnerability affects version 7.x on Windows.

SOLUTION:
The vendor is reportedly working on a fix.

PROVIDED AND/OR DISCOVERED BY:
Damian Saura, Anibal Sacco, Dario Menichelli, Norberto Kueffner, and
Andres Blanco y Rodrigo Carvalho of Core Security Technologies

ORIGINAL ADVISORY:
CORE-2008-0320:
http://www.coresecurity.com/index.php5?module=ContentMod&action=item&id=2249

Sophos:
http://www.sophos.com/support/knowledgebase/article/37810.html

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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.

Subscribe:
http://secunia.com/secunia_security_advisories/

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


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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