Vulnerability Alert

Microsoft Internet Explorer CDwnBindInfo Object Processing Use-After-Free Vulnerability

 
Threat Type:CWE-119: Buffer Errors
IntelliShield ID:27711
Version:2
First Published:2013 January 02 14:58 GMT
Last Published:2013 January 14 19:50 GMT
Port: Not available
CVE:CVE-2012-4792
BugTraq ID:57070
Urgency:Possible use
Credibility:Confirmed
Severity:Moderate Damage
CVSS Base:9.3 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:7.7
 
Version Summary:Microsoft has released a security bulletin and software updates to address the Microsoft Internet Explorer CDwnBindInfo object processing use-after-free 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 the way the affected software accesses an object in memory. An unauthenticated, remote attacker could exploit the vulnerability by convincing a targeted user to visit a malicious website. If successful, an attacker could execute arbitrary code under the security context of the user.

Functional code that exploits this vulnerability is available as part of the Metasploit framework.

Microsoft has confirmed this vulnerability and software updates are available.
 
Warning Indicators
Microsoft Internet Explorer 6, 7, and 8 are vulnerable when running on the following systems:
  • Windows XP SP3
  • Windows XP Professional x64 Edition SP2
  • Windows Server 2003 SP2
  • Windows Server 2003 x64 Edition SP2
  • Windows Server 2003 SP2 for Itanium-based Systems
  • Windows Vista SP2 
  • Windows Vista x64 Edition SP2 
  • Windows Server 2008 for 32-bit Systems SP2
  • Windows Server 2008 for x64-based Systems SP2 
  • Windows Server 2008 for Itanium-based Systems SP2
  • Windows Server 2008 R2 for x64-based Systems SP1 and prior
  • Windows Server 2008 R2 for Itanium-based Systems SP1 and prior
  • Windows 7 for 32-bit Systems SP1 and prior
  • Windows 7 for x64-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 indicate that this vulnerability is being exploited in the wild.
 
Vendor Announcements
Microsoft has released a security advisory at the following link: 2794220. Microsoft has released a security bulletin for security advisory 2794220 at the following link: MS13-008
 
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 gain complete control over the system.
 
Technical Information
The vulnerability is due to the way that Internet Explorer accesses an object in memory that has been deleted or has not been properly allocated. When the CButton object is freed, the reference can be kept and used again during a page reload, resulting in a use-after-free condition.

An unauthenticated, remote attacker could exploit the vulnerability by convincing a targeted user to visit a malicious website. Successful exploitation could allow an attacker to execute arbitrary code in the security context of the targeted user.
 
Safeguards
Administrators are advised to apply the appropriate updates.

Administrators are advise to apply the MSHTML Shim Workaround solution, which prevents exploitation of this vulnerability. Details on applying this workaround are provided at the following link: Microsoft Fix

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 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 Windows Update website. 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
1792/0Internet Explorer CButton User After FreeS6862013 Jan 03 
 
Alert History
 
Version 1, January 2, 2013, 9:58 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 | 7.0 Base | 8.0 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 SP2 | Datacenter Edition, 64-bit (Itanium) SP2 | Datacenter Edition x64 (AMD/EM64T) SP2 | Enterprise Edition SP2 | Enterprise Edition, 64-bit (Itanium) SP2 | Enterprise Edition x64 (AMD/EM64T) SP2 | Standard Edition SP2 | Standard Edition, 64-bit (Itanium) SP2 | Standard Edition x64 (AMD/EM64T) SP2 | Web Edition SP2
Microsoft, Inc.Windows Server 2008 Datacenter Edition SP2 | Datacenter Edition, 64-bit SP2 | Itanium-Based Systems Edition SP2 | Enterprise Edition SP2 | Enterprise Edition, 64-bit SP2 | Essential Business Server Standard SP2 | Essential Business Server Premium SP2 | Essential Business Server Premium, 64-bit SP2 | Standard Edition SP2 | Standard Edition, 64-bit SP2 | Web Server SP2 | Web Server, 64-bit 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 SP2 | Home Premium SP2 | Business SP2 | Enterprise SP2 | Ultimate SP2 | Home Basic x64 Edition SP2 | Home Premium x64 Edition SP2 | Business x64 Edition SP2 | Enterprise x64 Edition SP2 | Ultimate x64 Edition SP2
Microsoft, Inc.Windows XP Home Edition SP3 | Professional Edition SP3 | Professional x64 (AMD/EM64T) SP2 | Tablet PC Edition SP3 | Media Center Edition SP3




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