Microsoft Internet Explorer CHTML Use-After-Free Remote Code Execution VulnerabilityZDI-13-030: February 14th, 2013
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 CSelectionManager objects. The issues lies in the usage of an onbeforedeactivate event handler. 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.
Vendor ResponseMicrosoft has issued an update to correct this vulnerability. More details can be found at:
2012-12-10 - Vulnerability reported to vendor
2013-02-14 - Coordinated public release of advisory
CreditThis vulnerability was discovered by:
Stephen Fewer of Harmony Security (www.harmonysecurity.com)