Microsoft Internet Explorer CBlockElement Use-After-Free Remote Code Execution Vulnerability

ID ZDI-13-219
Type zdi
Reporter Arthur Gerkis
Modified 2013-11-09T00:00:00


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 handling of CBlockElement objects. The issue lies in the usage of MutationEvents on pop-up windows. By manipulating a document's elements an attacker can force a dangling pointer to be reused after it has been freed. An attacker can leverage this vulnerability to execute code under the context of the current process.