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A new version (0.9.0.0 - Release Candidate 1) of the free Secunia PSI
has been released. The new version includes many new and advanced
features, which makes it even easier to stay patched.

Download and test it today:
https://psi.secunia.com/

Read more about this new version:
https://psi.secunia.com/?page=changelog

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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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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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