Advisory Details

February 14th, 2013

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

ZDI-13-030
ZDI-CAN-1707

CVE ID CVE-2013-0029
CVSS SCORE 6.8, AV:N/AC:M/Au:N/C:P/I:P/A:P
AFFECTED VENDORS Microsoft
AFFECTED PRODUCTS Internet Explorer
VULNERABILITY DETAILS


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.

ADDITIONAL DETAILS Microsoft has issued an update to correct this vulnerability. More details can be found at:
http://technet.microsoft.com/en-us/security/bulletin/MS13-009
DISCLOSURE TIMELINE
  • 2012-12-10 - Vulnerability reported to vendor
  • 2013-02-14 - Coordinated public release of advisory
CREDIT Stephen Fewer of Harmony Security (www.harmonysecurity.com)
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