TippingPoint Zero Day Initiative
 

Microsoft Windows Font Object Buffer Overflow Privilege Escalation Vulnerability

ZDI-17-285: April 11th, 2017

CVE ID

CVSS Score

Affected Vendors

Affected Products

    Windows

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 processing of font data in win32k.sys. By making API calls with crafted parameters, code 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

    2016-12-12 - Vulnerability reported to vendor
    2017-04-11 - Coordinated public release of advisory

Credit

This vulnerability was discovered by:
    bear13oy of CloverSec Labs