Avast! Antivirus is an application that provides virus protection. The application is exposed to a local privilege escalation issue because the "aavmKer4.sys" driver fails to sufficiently sanitize user-supplied input passed to IOCTL 0xb2d6000c and 0xb2d60034. Avast! Antivirus versions earlier than 4.8.1356 are affected by this issue.
Ref:
http://www.ntinternals.org/ntiadv0904/ntiadv0904.html
09.45.2 - CVE: CVE-2009-3523
Platform: Third Party Windows Apps