Microsoft Internet Explorer HelpPane Sandbox Bypass Vulnerability

2015-08-11T00:00:00
ID ZDI-15-386
Type zdi
Reporter Ashutosh Mehra (https://twitter.com/ashutoshmehra)
Modified 2015-11-09T00:00:00

Description

This vulnerability allows remote attackers to escape Protected Mode 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 HelpPane executable. The issue lies in the validation of the integrity level of the COM client, which is performed with a comparison against the integrity level of the desktop's shell. An attacker can leverage this vulnerability to execute code under the context of the user at medium integrity.