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TITLE:
avast! Antivirus Device Driver Memory Overwrite Vulnerability

SECUNIA ADVISORY ID:
SA15495

VERIFY ADVISORY:
http://secunia.com/advisories/15495/

CRITICAL:
Less critical

IMPACT:
Privilege escalation, DoS

WHERE:
Local system

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

DESCRIPTION:
Piotr Bania has reported a vulnerability in avast! Antivirus, which
can be exploited by malicious, local users to cause a DoS (Denial of
Service) or gain escalated privileges.

The vulnerability is caused due to missing input validation in the
device driver and can be exploited to overwrite arbitrary memory via
signals with specially crafted input.

Successful exploitation allows execution of arbitrary code with
escalated privileges.

The vulnerability has been reported in version 4.6. Other versions
may also be affected.

SOLUTION:
Update to version 4.6.665 or later.

PROVIDED AND/OR DISCOVERED BY:
Piotr Bania

ORIGINAL ADVISORY:
Piotr Bania:
http://pb.specialised.info/all/adv/avast-adv.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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