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[SA29605] avast! Home/Professional aavmker4.sys Privilege Escalation

From: Secunia Security Advisories (sec-advsecunia.com)
Date: Mon Mar 31 2008 - 21:17:05 CDT

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TITLE:
avast! Home/Professional aavmker4.sys Privilege Escalation

SECUNIA ADVISORY ID:
SA29605

VERIFY ADVISORY:
http://secunia.com/advisories/29605/

CRITICAL:
Less critical

IMPACT:
Privilege escalation

WHERE:
Local system

SOFTWARE:
avast! Home/Professional 4.x
http://secunia.com/product/5162/

DESCRIPTION:
Tobias Klein has reported a vulnerability in avast!
Home/Professional, which can be exploited by malicious, local users
to gain escalated privileges.

An input validation error within the 0xb2d60030 IOCTL handler of the
aavmker4.sys driver can be exploited e.g. to overwrite arbitrary
kernel memory via a specially crafted IOCTL request.

The vulnerability is reported in version 4.7. Other versions may also
be affected.

SOLUTION:
Update to version 4.8.1169.
http://www.avast.com/eng/download.html

PROVIDED AND/OR DISCOVERED BY:
Tobias Klein

ORIGINAL ADVISORY:
avast!:
http://www.avast.com/eng/avast-4-home_pro-revision-history.html

Tobias Klein:
http://www.trapkit.de/advisories/TKADV2008-002.txt

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