Microsoft Internet Explorer Layout Remote Code Execution Vulnerability

2013-02-01T00:00:00
ID ZDI-13-007
Type zdi
Reporter Stephen Fewer of Harmony Security (www.harmonysecurity.com)
Modified 2013-11-09T00:00:00

Description

This vulnerability allows remote attackers to execute arbitrary code 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 way Internet Explorer handles CCaret objects. After the CCaret object has been freed there exists a race condition to reclaim the target objects heap buffer before a background thread issues a message to update the screen caret and reuse the stale pointer. An attacker can leverage this vulnerability to execute code under the context of the current process.