Microsoft Internet Explorer Use After Free Vulnerability

Notification Type: IBM Security Solutions Protection Alert
Notification Date: May 15, 2013
Notification Version: 1.0
   
Name: Microsoft Internet Explorer Use After Free Vulnerability
Public disclosure/
In the wild date:
May 03, 2013
Aliases: MS13-038
Risk: Critical
CVE: CVE-2013-1347
Description:

There is a use-after-free vulnerability affecting Microsoft Internet Explorer 8 (only ). The vulnerability came to light when it was used in a watering hole attack after a breach of a US Department of Labor (DoL) server. This vulnerability has been exploited in the wild by attackers to gain remote code execution in the context of the current user.

 

ISS Coverage

Product Content Version
Network Protection XGS
Proventia Network IDS
Proventia Network IPS
Proventia Network MFS
Proventia Server (Linux)
RealSecure Network
RealSecure Server Sensor
33.050
Proventia Desktop
Proventia Server IPS (Windows)
2880
Propagation Techniques ISS Protection Available

remote exploit

Script_IE_Datalist_Uaf*

HTML_IE_Time_Heap_Abuse*

Script_Suspicious_Score*

15 May 2013

15 May 2013

14 Sep 2010

* These signatures are blocked in the default policy.

Additional note: Attacks exploiting this vulnerability and attacks exploiting CVE-2013-2551 are very similar in nature and are detected using the same events. Script_Suspicious_Score is also known to detect a particular exploit of CVE-2013-1347.

Detailed Description

Business Impact:

Compromise of networks and machines using affected versions of Internet Explorer may lead to exposure of confidential information, loss of productivity, and further network compromise. Remote code execution could be achieved by enticing a user to visit a specially crafted web page exploiting this vulnerability, either in HTML email messages or otherwise.

*CVSS Base Score: 9.3
  Access Vector: Network
Access Complexity: Medium
Authentication: None
Confidentiality Impact: Complete
Integrity Impact: Complete
Availability Impact: Complete
Adjusted Temporal Score: 7.7
  Exploitability: Functional
Remediation Level: Official-Fix
Report Confidence: Confirmed
Affected Products:

See References for details.

Technical Description:

This is a use-after-free CGenericElement object whereby the browser maintains a reference of the object even after it is freed. On subsequent rendering, this controllable memory is then used again, thus allowing arbitrary code execution. All that is required for a user to be exploited is to visit a page with malicious code. This vulnerability is actively being exploited in the wild, and Microsoft has released a FixIt (see references for link) for this issue. Affected users are strongly encouraged to apply the patch, or upgrade the browser as soon as possible.

Remediation:

A patch is available, see references below for details

References

XFDB: http://xforce.iss.net/xforce/xfdb/84007
Microsoft: http://technet.microsoft.com/en-us/security/bulletin/ms13-038

Revision History

1.0 Initial publication.

* According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES "AS IS" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.
The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

About IBM Security Systems

IBM Security Systems include an extensive portfolio of hardware, software solutions, professional and managed services offerings covering the spectrum of IT and business security risks: people and identity, data and information, application and process, network, server and endpoint and physical infrastructure, empowering clients to innovate and operate their businesses on the most secure infrastructure platforms. Through world-class solutions that address risk across the enterprise, IBM helps organizations build a strong security posture that helps reduce costs, improve service, and manage risk. IBM X-Force(R) Research and Development is one of the most renowned commercial security research and development groups in the world. For more information on how to address today's biggest risks, please visit us at ibm.com/security.