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Vulnerability Alert

Microsoft Internet Explorer CTreePos Object Handling Use-After-Free Vulnerability

 
Threat Type:CWE-119: Buffer Errors
IntelliShield ID:29555
Version:2
First Published:2013 June 11 17:27 GMT
Last Published:2013 June 28 20:30 GMT
Port: Not available
CVE:CVE-2013-3125
BugTraq ID:60377
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Moderate Damage
CVSS Base:9.3 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:6.9
Related Resources:
View related IPS SignatureView related Event Response
 
 
Version Summary:Additional technical information is available that describes the Microsoft Internet Explorer CTreePos object handling use-after-free vulnerability.
 
 
Description
A vulnerability in Microsoft Internet Explorer could allow an unauthenticated, remote attacker to execute arbitrary code.

The vulnerability is due to improper memory operations performed by the affected software when handling crafted content. An unauthenticated, remote attacker could exploit this vulnerability by persuading a user to view a malicious website. A successful exploit could allow the attacker to execute arbitrary code with the privileges of the user. If the user holds elevated privileges, the attacker could completely compromise the targeted system.

Microsoft has confirmed the vulnerability in a security bulletin and released software updates.
 
Warning Indicators
Internet Explorer 10 is affected when running on the following Microsoft products:
  • Windows 7 for 32-bit and x64-based Systems SP1
  • Windows Server 2008 R2 for x64-based Systems SP1
  • Windows 8 for 32-bit and 64-bit Systems
  • Windows Server 2012
  • Windows RT
 
IntelliShield Analysis
To exploit the vulnerability, the attacker may provide a link that directs a user to a malicious site or persuade a user to open a malicious file intended to submit malicious input to the affected software.

Microsoft has resolved the vulnerability by correcting the way Internet Explorer handles objects in memory.

The Cisco Applied Intelligence team has created an Applied Mitigation Bulletin to address vulnerabilities that Microsoft disclosed in the June 2013 security bulletin release. This Cisco bulletin, which assists administrators in identifying or mitigating these vulnerabilities using Cisco devices, is available at the following link: Cisco Applied Mitigation Bulletin: Microsoft Security Bulletin Release for June 2013
 
Vendor Announcements
Microsoft has released a security bulletin at the following link: MS13-047
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to execute arbitrary code with the privileges of the user. If the user holds elevated privileges, the attacker could completely compromise the targeted system.
 
Technical Information
The vulnerability is due to a use-after-free memory corruption error that may occur when Internet Explorer attempts to undo Document Object Model (DOM) manipulations using the execCommand when handling CTreePos objects in memory.

An unauthenticated, remote attacker could exploit this vulnerability by persuading a targeted user to follow a link to a document with crafted elements designed to submit malicious input to the affected software. When the affected software handles the malicious document elements, a dangling pointer may be reused after being freed, leading to a memory corruption error could allow the attacker to execute arbitrary code with the privileges of the user. If the user holds elevated privileges, the attacker could completely compromise the targeted system.
 
Safeguards
Administrators are advised to apply the appropriate updates.

Administrators are advised to allow only trusted users to have network access.

Administrators may consider using the Microsoft Baseline Security Analyzer (MBSA) scan tool to identify common security misconfigurations and missing security updates on system endpoints.

Administrators may consider configuring the Microsoft Enhanced Mitigation Experience Toolkit (EMET) to work with the affected software.

Users are advised not to open e-mail messages from suspicious or unrecognized sources. If users cannot verify that links or attachments included in e-mail messages are safe, they are advised not to open them.

Users are advised not to visit websites or follow links that have suspicious characteristics or cannot be verified as safe.

Administrators are advised to use an unprivileged account when browsing the Internet.

Administrators are advised to monitor critical systems.
 
Patches/Software
Microsoft customers can obtain updates directly by using the links in the security bulletin. These updates are also distributed by Windows automatic update features and available on the Microsoft Update service. Microsoft Windows Server Update Services (WSUS), Systems Management Server, and System Center Configuration Manager can assist administrators in deploying software updates.

Signatures
 
Cisco Intrusion Prevention System (IPS) 6.0
Signature IDSignature NameReleaseLatest Release Date
2309/0Microsoft Internet Explorer Use After Free VulnerabilityS7232013 Jun 11 
 
Alert History
 
Version 1, June 11, 2013, 5:27 PM: Microsoft Internet Explorer contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code on a targeted system. Updates are available.


Product Sets
 
The security vulnerability applies to the following combinations of products.

Primary Products:
Microsoft, Inc.Internet Explorer 10.0 Base

Associated Products:
Microsoft, Inc.Windows 7 for 32-bit systems SP1 | for x64-based systems SP1
Microsoft, Inc.Windows RT Original Release Base
Microsoft, Inc.Windows Server 2008 R2 x64-Based Systems Edition SP1
Microsoft, Inc.Windows Server 2012 Original Release Base
Microsoft, Inc.Windows 8 for 32-bit systems Base | for x64-based systems Base




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