eEye Digital Security eEye Digital Security
  • Login to the eEye Business Client Portal
  • Shop for eEye Products
  • Read the eEye Blog
  • Subscribe to eEye RSS Feeds
  • Follow eEye on Twitter
  • Follow eEye of Facebook
Resources

Research > Zero-Day Tracker > 20130917

IE 8/9 mshtml.dll NULL_IMPORT_DESCRIPTOR Use After Free

Date Disclosed:
9/17/2013

Date Patched:
Patch Not Yet Available

Vendor:
Microsoft

Affected Software:
Internet Explorer 6
Internet Explorer 7
Internet Explorer 8 (in the wild, targeted attacks focusing on XP and 7)
Internet Explorer 9 (in the wild, targeted attacks focusing on XP and 7)
Internet Explorer 10
Internet Explorer 11

Description:
There is a use after free in Internet Explorer, that when combined with a non-ASLR Office DLL, can allow for remote code execution in the context of the currently logged on user. This attack has been spotted in the wild in Japan, in targeted attacks. The attack is not widespread yet. However, with the introduction of a Microsoft Fix it, attackers may be able to more easily deduce the vulnerability being targeted, and produce exploits.

Severity:
High

Code Execution:
Yes.

Impact:
Remote Code Execution
Exploitation of this vulnerability is possible through the use of methods like drive-by attacks. Remote attackers who successfully exploit this vulnerability will be able to execute code on the vulnerable system with the same rights as the currently logged on user.

Mitigation:
Apply the Microsoft Fix it immediately to prevent exploitation. Additionally, EMET 4.0 mitigates this attack. Otherwise, use other browsers such as Chrome.

Protection:
BeyondTrust's Retina® Network Security Scanner scans devices to detect for this vulnerability.

  • 30541 - Microsoft Internet Explorer MSHTML NULL_IMPORT_DESCRIPTOR (Zero-Day)
  • 30542 - Microsoft Internet Explorer MSHTML NULL_IMPORT_DESCRIPTOR (Zero-Day) - x64

Links:

Status:
2013-09-17 - Public advisory released

Copyright ©1998-2011 eEye Digital Security
Permission is hereby granted for the redistribution of this alert electronically. It is not to be edited in any way without express consent of eEye. If you wish to reprint the whole or any part of this alert in any other medium excluding electronic medium, please email alert@eEye.com for permission.

Disclaimer
The information within this paper may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are no warranties, implied or express, with regard to this information. In no event shall the author be liable for any direct or indirect damages whatsoever arising out of or in connection with the use or spread of this information. Any use of this information is at the user's own risk.

Next Steps

Free Trial
Test drive an eEye product
On-demand Demo
See an online product tour
One-on-one Demo
Schedule a personalized tour
Compare Products
See side-by-side features
Buy Now
Go to eEye product store
Contact | Site Map | Privacy | Website Feedback | 1.866.339.3732
© 1998 – 2012 eEye Digital Security. All rights reserved.