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

August 19th, 2016
ZDI-16-487 ZDI-CAN-3761

CVE ID

CVSS Score

6.9 AV:L/AC:M/Au:N/C:C/I:C/A:C

Affected Vendors

AVG

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.

Additional Details


Patched in fixed in AVG Internet Security version 16.101.0.7752, which was released on August 4, 2016.


Disclosure Timeline

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

Credit

bee13oy of CloverSec Labs

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