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>> avast! Home/Professional "aavmker4.sys" Privilege Escalation Issue

Title : avast! Home/Professional "aavmker4.sys" Privilege Escalation Issue
VUPEN ID : VUPEN/ADV-2008-1034
CVE ID : CVE-2008-1625
Rated as : Moderate Risk 
Remotely Exploitable : No
Locally Exploitable : Yes
Release Date : 2008-03-31


Technical Description    Receive VUPEN Security alerts in a Text format  Receive VUPEN Security alerts in a PDF format  Receive VUPEN Security alerts in an XML format  Receive VUPEN Security notifications by SMS 

A vulnerability has been identified in avast! Home/Professional, which could be exploited by local attackers to obtain elevated privileges. This issue is caused by an input validation error in the "aavmker4.sys" driver when processing user-supplied data, which could be exploited by unprivileged users to overwrite memory addresses via the IOCTL call 0xb2d60030 and execute arbitrary code with kernel privileges.

Affected Products

avast! Home/Professional versions prior to 4.8.1169

Solution

Upgrade to version 4.8.1169 :
http://www.avast.com/eng/updates.html

References

http://www.vupen.com/english/advisories/2008/1034
http://www.avast.com/eng/avast-4-home_pro-revision-history.html
http://www.trapkit.de/advisories/TKADV2008-002.txt

Credits

Vulnerability reported by Tobias Klein.

ChangeLog

2008-03-31 : Initial release

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