‘Microsoft Internet Explorer selection.empty Code Execution Vulnerability’

Summary

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Microsoft Internet Explorer.’

Credit:

‘The original article can be found at: http://www.zerodayinitiative.com/advisories/ZDI-11-195/


Details

Vulnerable Systems:
 * Microsoft Internet Explorer 9
 * Microsoft Internet Explorer 8

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 the javascript statement ‘selection.empty’ during certain onclick events. By causing a particular sequence of events, an attacker can cause a CDisplayObject to be freed while it is still in use. This results in an operation on previously freed memory that can be utilized to achieve remote code execution.

Patch Availability:
Microsoft has issued an update to correct this vulnerability. More details can be found at:
http://www.microsoft.com/technet/security/Bulletin/MS11-050.mspx

CVE Information:
CVE-2011-1261

Disclosure Timeline:
2011-04-04 – Vulnerability reported to vendor
2011-06-14 – Coordinated public release of advisory’

Categories: Windows