Advisory Details

August 9th, 2011

Microsoft Internet Explorer 9 STYLE Object Parsing Remote Code Execution Vulnerability

ZDI-11-248
ZDI-CAN-1244

CVE ID CVE-2011-1964
CVSS SCORE 9.0, (AV:N/AC:L/Au:N/C:P/I:P/A:C)
AFFECTED VENDORS Microsoft
AFFECTED PRODUCTS Internet Explorer
TREND MICRO CUSTOMER PROTECTION Trend Micro TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 11456. 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 part of the application that is responsible for handling STYLE elements. By creating a STYLE element with an invalid behavior, an attacker can force an object of invalid type to be called, resulting in corruption of heap memory. This can be leveraged by an attacker to achieve code execution under the context of the application.

ADDITIONAL DETAILS Microsoft has issued an update to correct this vulnerability. More details can be found at:
http://www.microsoft.com/technet/security/bulletin/MS11-057.mspx
DISCLOSURE TIMELINE
  • 2011-05-25 - Vulnerability reported to vendor
  • 2011-08-09 - Coordinated public release of advisory
CREDIT Stephen Fewer of Harmony Security (www.harmonysecurity.com)
BACK TO ADVISORIES