Microsoft Internet Explorer HelpPane Sandbox Bypass Vulnerability

ID ZDI-15-386
Type zdi
Reporter Ashutosh Mehra (
Modified 2015-06-22T00:00:00


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.