Vulnerability Alert

Microsoft Internet Explorer Script Debugging Memory Corruption Vulnerability

 
Threat Type:CWE-119: Buffer Errors
IntelliShield ID:29556
Version:2
First Published:2013 June 11 17:53 GMT
Last Published:2013 June 29 07:04 GMT
Port: Not available
CVE:CVE-2013-3126
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Moderate Damage
CVSS Base:9.3 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:6.9
 
Version Summary:Additional technical information is available regarding the Microsoft Internet Explorer script debugging memory corruption 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 debugging scripts for 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 system.

Microsoft has confirmed the vulnerability in a security bulletin and released software updates.
 
Warning Indicators
Microsoft Internet Explorer versions 9 and 10 are affected when running on the following Microsoft products:
  • Windows Vista and x64 Edition SP2
  • Windows Server 2008 for 32-bit Systems SP2
  • Windows Server 2008 for x64-based Systems SP2
  • 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.

Script debugging is not enabled by default; however, users can still debug scripts using the Developer Tools (F12) when using 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 improper handling of strings that contain signed values by the Internet Explorer JavaScript console.

An unauthenticated, remote attacker could exploit this vulnerability by convincing a targeted user to view a website designed to cause the browser to process malicious string values. Processing of the string values could cause Internet Explorer to cause an error that could result in memory corruption. The attacker could leverage the memory corruption to execute arbitrary code within the security context of the targeted user.

 
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.

Administrators may consider implementing a group policy to disable the ability to use F12 to access the Developer Tools function.

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.
 
Alert History
 
Version 1, June 11, 2013, 05:53 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 9.0 Base | 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 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 | 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 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




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