TippingPoint Zero Day Initiative

AVG Internet Security avgtdix.sys Kernel Driver Untrusted Pointer Dereference Privilege Escalation Vulnerability

ZDI-16-487: August 19th, 2016

CVSS Score

Affected Vendors


Affected Products

    Internet Security

Vulnerability Details

This vulnerability allows local attackers to escalate privileges on vulnerable installations of AVG Internet Security. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The specific flaw exists within processing of the 0x83002120 IOCTL by the AvgTdix device driver. The issue lies in the failure to properly validate a user-supplied value prior to dereferencing it as a pointer. An attacker can leverage this vulnerability to execute arbitrary code under the context of kernel.

Vendor Response

AVG states:

Patched in fixed in AVG Internet Security version, which was released on August 4, 2016.

Disclosure Timeline

    2016-05-31 - Vulnerability reported to vendor
    2016-08-19 - Coordinated public release of advisory


This vulnerability was discovered by:
    bee13oy of CloverSec Labs