TippingPoint Zero Day Initiative

Microsoft Windows DrawIconEx Buffer Overflow Privilege Escalation Vulnerability

ZDI-17-168: March 21st, 2017


CVSS Score

Affected Vendors

Affected Products


Vulnerability Details

This vulnerability allows local attackers to escalate privileges on vulnerable installations of Microsoft Windows. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.

The specific flaw exists within the code in the Windows kernel that renders icons. By supplying certain parameter values in a call to DrawIconEx, an attacker can trigger an overflow of a buffer. An attacker can leverage this vulnerability to escalate privilege to SYSTEM.

Vendor Response

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

Disclosure Timeline

    2016-10-06 - Vulnerability reported to vendor
    2017-03-21 - Coordinated public release of advisory


This vulnerability was discovered by:
    bear13oy of CloverSec Labs