TippingPoint Zero Day Initiative
 

Microsoft Windows PlgBlt Out-Of-Bounds Read Information Disclosure Vulnerability

ZDI-17-735: September 15th, 2017

CVE ID

CVSS Score

Affected Vendors

Affected Products

    Windows

Vulnerability Details


This vulnerability allows local attackers to disclose sensitive information 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 vPlgWrite1 in the win32kfull driver. The issue results from the lack of proper validation of user-supplied data, which can result in a memory access past the end of an allocated data structure. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary 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

    2017-08-04 - Vulnerability reported to vendor
    2017-09-15 - Coordinated public release of advisory

Credit

This vulnerability was discovered by:
    Jaanus Kp
    Clarified Security