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Vulnerability Alert

Microsoft Internet Explorer execCommand Method Use-After-Free Arbitrary Code Execution Vulnerability

 
Threat Type:CWE-119: Buffer Errors
IntelliShield ID:26936
Version:4
First Published:2012 September 17 15:30 GMT
Last Published:2012 September 21 19:07 GMT
Port: Not available
CVE:CVE-2012-4969
BugTraq ID:55562
Urgency:Possible use
Credibility:Confirmed
Severity:Moderate Damage
CVSS Base:9.3 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:7.7
Related Resources:
View related IPS Signature
 
 
Version Summary:Microsoft has released a security advisory and software updates to address the Microsoft Internet Explorer execCommand method use-after-free arbitrary code execution vulnerability.
 
 
Description
Microsoft Internet Explorer contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code on a targeted system.

The vulnerability is due to errors in processing input to the execCommand() method in Internet Explorer. An unauthenticated, remote attacker could exploit this vulnerability by convincing a user to view a malicious website. If successful, the attacker could exploit this vulnerability to execute arbitrary code on the system with the privileges of the user.

Functional code that demonstrates an exploit of this vulnerability is publicly available.

Microsoft has confirmed the vulnerability in a security bulletin and released software updates.
 
Warning Indicators
Microsoft Internet Explorer versions 6, 7, 8, and 9 are vulnerable when running on the following systems:
  • Windows XP SP3 and prior
  • Windows XP Professional x64 Edition SP2 and prior
  • Windows Server 2003 SP2 and prior
  • Windows Server 2003 x64 Edition SP2 and prior
  • Windows Server 2003 with SP2 for Itanium-based Systems and prior
  • Windows Vista SP2 and prior
  • Windows Vista x64 Edition SP2 and prior
  • Windows Server 2008 for 32-bit Systems SP2 and prior
  • Windows Server 2008 for x64-based Systems SP2 and prior
  • Windows Server 2008 for Itanium-based Systems SP2 and prior
  • Windows 7 for 32-bit Systems SP1 and prior
  • Windows 7 for x64-based Systems SP1 and prior
  • Windows Server 2008 R2 for x64-based Systems SP1 and prior
  • Windows Server 2008 R2 for Itanium-based Systems SP1 and prior
 
IntelliShield Analysis
To exploit the vulnerability, the attacker may provide a link that directs a user to a malicious site and use misleading language or instructions to persuade the user to follow the provided link.

Reports have indicated that this vulnerability is being actively exploited in the wild.
 
Vendor Announcements
Microsoft has released a security bulletin at the following link: MS12-063

Microsoft has released a security advisory at the following link: 2757760
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to execute arbitrary code on a targeted system with the privileges of the user. If the user holds elevated privileges, the attacker could use the elevated privileges to conduct further attacks.
 
Technical Information
The vulnerability is due to errors in processing input to the execCommand() method in Internet Explorer. Improper handling of input to the vulnerable function could cause Internet Explorer to access previously removed or uninitialized memory areas, corrupting memory.

An unauthenticated, remote attacker could exploit this vulnerability by convincing a user to view a malicious web page. Processing the web page could trigger memory corruption, which the attacker could use to execute arbitrary code on the system with the privileges of the user.
 
Safeguards
Administrators are advised to apply the appropriate updates.

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.

Administrators running Internet Explorer on Windows Server 2003, Windows Server 2008, or Windows Server 2008 R2 are advised to ensure Enhanced Security Configuration is enabled. This mode is enabled by default and mitigates this vulnerability.

Administrators may consider installing the Enhanced Mitigation Experience Toolkit v3.0 (EMET) which helps prevent software vulnerabilities from being successfully exploited for code execution. Additional information, including a link to download EMET v3.0, is available at the following link: Knowledgebase Article 2458544

Administrators are advised to apply the Microsoft-Fix-It solution that prevents exploitation of this vulnerability for some scenarios. Additional information, including a link to apply the solution, is available at the following link: Microsoft Fix it 50939

Administrators are advised to monitor affected 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
1466/0Microsoft Internet Explorer execCommand VulnerabilityS6682012 Sep 18 
 
Alert History
 

Version 3 September 20, 2012, 02:28 PM: Microsoft has released additional information to address the Microsoft Internet Explorer img tag processing arbitrary code execution vulnerability.

Version 2, September 18, 2012, 9:19 AM: Microsoft has released a security advisory to address the Microsoft Internet Explorer img tag processing arbitrary code execution vulnerability.

Version 1, September 17, 2012, 11:30 AM: Microsoft Internet Explorer contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code on a targeted system. Updates are not available.


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

Primary Products:
Microsoft, Inc.Internet Explorer 6.0 Base, SP1, SP2 | 7.0 Base | 8.0 Base | 9.0 Base

Associated Products:
Microsoft, Inc.Windows 7 for 32-bit systems Base, SP1 | for x64-based systems Base, SP1
Microsoft, Inc.Windows Server 2003 Datacenter Edition Base, SP1, SP2 | Datacenter Edition, 64-bit (Itanium) Base, SP1, SP2 | Datacenter Edition x64 (AMD/EM64T) Base, SP1, SP2 | Enterprise Edition Base, SP1, SP2 | Enterprise Edition, 64-bit (Itanium) Base, SP1, SP2 | Enterprise Edition x64 (AMD/EM64T) Base, SP1, SP2 | Standard Edition Base, SP1, SP2 | Standard Edition, 64-bit (Itanium) Base, SP1, SP2 | Standard Edition x64 (AMD/EM64T) Base, SP1, SP2 | Web Edition Base, SP1, SP2
Microsoft, Inc.Windows Server 2008 Datacenter Edition Base, SP1, SP2 | Datacenter Edition, 64-bit Base, SP1, SP2 | Itanium-Based Systems Edition Base, SP1, SP2 | Enterprise Edition Base, SP1, SP2 | Enterprise Edition, 64-bit Base, SP1, SP2 | Essential Business Server Standard Base, SP1, SP2 | Essential Business Server Premium Base, SP1, SP2 | Essential Business Server Premium, 64-bit Base, SP1, SP2 | Standard Edition Base, SP1, SP2 | Standard Edition, 64-bit Base, SP1, SP2 | Web Server Base, SP1, SP2 | Web Server, 64-bit Base, SP1, SP2
Microsoft, Inc.Windows Server 2008 R2 x64-Based Systems Edition Base, SP1 | Itanium-Based Systems Edition Base, SP1
Microsoft, Inc.Windows Vista Home Basic Base, SP1, SP2 | Home Premium Base, SP1, SP2 | Business Base, SP1, SP2 | Enterprise Base, SP1, SP2 | Ultimate Base, SP1, SP2 | Home Basic x64 Edition Base, SP1, SP2 | Home Premium x64 Edition Base, SP1, SP2 | Business x64 Edition Base, SP1, SP2 | Enterprise x64 Edition Base, SP1, SP2 | Ultimate x64 Edition Base, SP1, SP2
Microsoft, Inc.Windows XP Home Edition Base, SP1, SP2, SP3 | Professional Edition Base, SP1, SP2, SP3 | Professional x64 (AMD/EM64T) Base, SP2




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