TippingPoint Zero Day Initiative
 

(Pwn2Own) Microsoft Windows fnHKINLPRECT Untrusted Pointer Dereference Privilege Escalation Vulnerability

ZDI-17-470: July 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 win32kfull.sys driver. The issue results from the lack of proper validation of a user-supplied value prior to dereferencing it as a pointer. An attacker can leverage this vulnerability to escalate privilege to the level of SYSTEM.

Vendor Response

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

Disclosure Timeline

    2017-03-16 - Vulnerability reported to vendor
    2017-07-11 - Coordinated public release of advisory

Credit

This vulnerability was discovered by:
    GuoPengfei from 360 Codesafe Team