Advisory Details

June 14th, 2011

Microsoft Internet Explorer selection.empty Remote Code Execution Vulnerability

ZDI-11-195
ZDI-CAN-1137

CVE ID CVE-2011-1261
CVSS SCORE 7.5, (AV:N/AC:L/Au:N/C:P/I:P/A:P)
AFFECTED VENDORS Microsoft
AFFECTED PRODUCTS Internet Explorer 9
Internet Explorer 8
TIPPINGPOINT™ IPS CUSTOMER PROTECTION TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 11271. For further product information on the TippingPoint IPS: http://www.tippingpoint.com
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 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.

VENDOR RESPONSE 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
DISCLOSURE TIMELINE
  • 2011-04-04 - Vulnerability reported to vendor
  • 2011-06-14 - Coordinated public release of advisory
CREDIT Anonymous
BACK TO ADVISORIES