TippingPoint Zero Day Initiative

Microsoft Windows win32k RGNOBJ Integer Overflow Privilege Escalation Vulnerability

ZDI-16-449: August 9th, 2016


CVSS Score

Affected Vendors

Affected Products


Vulnerability Details

This vulnerability allows local attackers to execute arbitrary code on vulnerable installations of Microsoft Windows. 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 RGNOBJ objects. An integer overflow vulnerability occurs when an attacker combines rectangles with special coordinates. An attacker can leverage this vulnerability to escalate privileges and execute code under the context of SYSTEM.

Vendor Response

Microsoft has issued an update to correct this vulnerability. More details can be found at:

Disclosure Timeline

    2016-04-27 - Vulnerability reported to vendor
    2016-08-09 - Coordinated public release of advisory


This vulnerability was discovered by:
    bee13oy of CloverSec Labs