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Vulnerability Alert

Microsoft Internet Explorer Deleted Memory Object Code Execution Vulnerability

 
Threat Type:CWE-119: Buffer Errors
IntelliShield ID:33961
Version:4
First Published:2014 April 28 13:19 GMT
Last Published:2014 May 02 15:52 GMT
Port: Not available
CVE:CVE-2014-1776
BugTraq ID:67075
Urgency:Possible use
Credibility:Confirmed
Severity:Moderate Damage
CVSS Base:9.3 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:7.7
 
Version Summary:Additional information is available regarding methods used to exploit the Microsoft Internet Explorer deleted memory object code execution vulnerability.
 
 
Description
A vulnerability in Microsoft Internet Explorer could allow an unauthenticated, remote attacker to execute arbitrary code.

The vulnerability is due to a use-after-free condition that may occur in the affected software when handling crafted content. An unauthenticated, remote attacker could exploit this vulnerability by convincing a user to view a website that is designed to submit malicious input to the affected software. 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 system.

Microsoft has confirmed the vulnerability and released software updates.
 
Warning Indicators
Microsoft Internet Explorer versions 6, 7, 8, 9, 10, and 11 are vulnerable when running on the following systems:
  • Windows Server 2003 and x64 Edition SP2
  • Windows Server 2003 for Itanium-based Systems SP2
  • Windows Vista and x64 Edition SP2
  • Windows Server 2008 for 32-bit and x64-based Systems SP2
  • Windows Server 2008 for Itanium-based Systems SP2
  • Windows 7 for 32-bit and x64-based Systems SP1
  • Windows Server 2008 R2 for x64-based and Itanium-based Systems SP1
  • Windows 8 and 8.1 for 32-bit and x64 based Systems
  • Windows Server 2012 and Windows Server 2012 R2
  • Windows RT and Windows RT 8.1
 
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.

Although Internet Explorer 6 through 11 are affected by this vulnerability, currently available exploits observed in the wild target Internet Explorer 9 through 11 that have browser plug-ins such as Adobe Flash or Cisco MeetingPlace Express. The exploits use the browser plug-ins to evade detection or perform other malicious actions such as downloading exploit payloads, but are not vulnerable themselves.

The Cisco Threat Research, Analysis, and Communications (TRAC) team has created the following blog post with technical and signature information related to the vulnerability in Microsoft Internet Explorer: IE Zero Day and VGX.dll
 
Vendor Announcements
Microsoft has released a security bulletin at the following link: MS14-021

Microsoft has released a security advisory at the following link: 2963983

US-CERT has released a vulnerability note at the following link: VU#222929
 
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 completely compromise the system.
 
Technical Information
The vulnerability is due to a use-after-free condition that may occur in the affected software when handling crafted content.

An unauthenticated, remote attacker could exploit this vulnerability by convincing a user to view a website that is designed to submit malicious input to the affected software. 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.
 
Safeguards
Administrators are advised to apply the appropriate updates.

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

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

Users are advised to update browser plug-ins, or remove or disable plug-ins that are no longer in use or could be dangerous to operate. Users may consider allowing browser plug-ins to run only on trusted sites, configurable within Internet Explorer.

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

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

Administrators are advised to monitor critical systems.

Administrators are advised to implement an intrusion prevention system (IPS) or intrusion detection system (IDS) to help detect and prevent attacks that attempt to exploit this vulnerability.

Administrators can apply Snort signatures 30794 and 30803 to help prevent attacks that attempt to exploit this vulnerability.
 
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
4256/0Microsoft Internet Explorer Remote Code Execution VulnerabilityS7912014 Apr 29 
4256/1Microsoft Internet Explorer Remote Code Execution VulnerabilityS7942014 May 01 
 
Alert History
 

Version 3, May 1, 2014, 3:50 PM: Microsoft has released a security bulletin and software updates to address the Microsoft Internet Explorer deleted memory object code execution vulnerability.

Version 2, April 28, 2014, 2:13 PM: Additional information regarding the Microsoft Internet Explorer deleted memory object code execution vulnerability is available in a Cisco blog post, including the availability of IPS signatures.

Version 1, April 28, 2014, 9:19 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 | 9.0 Base | 10.0 Base | 11.0 Base

Associated Products:
Microsoft, Inc.Windows 7 for 32-bit systems SP1 | for x64-based systems SP1
Microsoft, Inc.Windows RT Original Release Base | 8.1 Base
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 SP1 | Itanium-Based Systems Edition SP1
Microsoft, Inc.Windows Server 2012 Original Release Base
Microsoft, Inc.Windows Server 2012 R2 Original Release Base
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 8 for 32-bit systems Base | for x64-based systems Base
Microsoft, Inc.Windows 8.1 for 32-bit Systems Base | for 64-bit Systems Base




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