Microsoft Windows NtUserfnINSTRINGNULL Information Leak Vulnerability

2015-03-10T00:00:00
ID ZDI-15-079
Type zdi
Reporter WanderingGlitch of HP's Zero Day Initiative
Modified 2015-11-09T00:00:00

Description

This vulnerability allows local attackers to leak sensitive information on vulnerable installations of Microsoft Windows. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The specific flaw exists within the handling of NtUserfnINSTRINGNULL function. The issue lies in the failure to sanitize a buffer before calling a userland function resulting in the leak of a kernel address. An attacker can leverage this in concert with another vulnerability to achieve code execution at SYSTEM.