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

2017-07-11T00:00:00
ID ZDI-17-470
Type zdi
Reporter GuoPengfei from 360 Codesafe Team
Modified 2017-06-22T00:00:00

Description

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.