Microsoft Internet Explorer Registry Link Elevation of Privilege Vulnerability

2015-08-11T00:00:00
ID ZDI-15-379
Type zdi
Reporter Ashutosh Mehra (https://twitter.com/ashutoshmehra)
Modified 2015-11-09T00:00:00

Description

This vulnerability allows remote attackers to escalate privileges on vulnerable installations of Microsoft Internet Explorer. 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 registry links. An attacker running code in a low-integrity Internet Explorer process can set a registry link that will be followed by the medium-integrity broker process, which will then reduce the security of the target registry key in such a way that it can be modified by low-integrity Internet Explorer processes. These registry keys can be used to execute medium-integrity processes from low-integrity Internet Explorer processes.