Vulnerability Alert

Microsoft Internet Explorer JScript9 Remote Code Execution Vulnerability

 
Threat Type:CWE-94: Code Injection
IntelliShield ID:25562
Version:1
First Published:2012 April 10 17:35 GMT
Last Published:2012 April 10 17:35 GMT
Port: Not available
CVE:CVE-2012-0169
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Moderate Damage
CVSS Base:9.3 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:6.9
 
Version Summary:

Microsoft Internet Explorer contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code on a targeted system.? Updates are available.

 
 
Description

Microsoft Internet Explorer contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code on a vulnerable system.

The vulnerability is due to errors when Internet Explorer attempts to access deleted objects.? An unauthenticated, remote attacker could exploit this vulnerability by persuading a user to visit a malicious website, allowing the attacker to execute code on the affected system.

Microsoft has confirmed this vulnerability in a security bulletin and has released updated software.

 
Warning Indicators

The following Microsoft products are affected:

  • Internet Explorer 9 for Windows Vista SP2 and prior
  • Internet Explorer 9 for Windows Vista x64 Edition SP2 and prior
  • Internet Explorer 9 for Windows Server 2008 for 32-bit Systems SP2 and prior
  • Internet Explorer 9 for Windows Server 2008 for x64-based Systems SP2 and prior
  • Internet Explorer 9 for Windows 7 for 32-bit Systems SP1 and prior
  • Internet Explorer 9 for Windows 7 for x64 based Systems SP1 and prior
  • Internet Explorer 9 for Windows Server 2008 R2 for x64-based Systems SP1 and prior
 
IntelliShield Analysis

To exploit the vulnerability, the attacker may provide a file or a link to a malicious website and use misleading language or instructions to persuade the user to open the file or follow the provided link.

Microsoft has corrected this vulnerability with an update that modifies 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?April 2012 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?April 2012.

 
Vendor Announcements

Microsoft has released a security bulletin at the following link: MS12-023

 
Impact

An unauthenticated, remote attacker could exploit this vulnerability to execute arbitrary code on a targeted system.? The code would execute in the context of the user who is logged in.? If this user holds administrative privileges, a complete system compromise could occur.

 
Technical Information

The vulnerability is triggered when vulnerable versions of Internet Explorer attempt to access an object that has been deleted in a way that corrupts memory via the JScript9.dll file.? An attacker could execute arbitrary code on the targeted system.

An unauthenticated, remote attacker who persuades a user to follow a link to a crafted website could exploit this vulnerability to execute arbitrary code on the system.? The attacker may provide a link or embed an ActiveX control that is marked safe for initialization in an application or Office document that uses the Internet Explorer rendering engine.? Successful exploitation could allow arbitrary code execution in the context of the user who is logged in.? If the user holds administrative privileges, a complete system compromise could occur.

 
Safeguards

Administrators are advised to apply the appropriate updates.

Users should verify that unsolicited links are safe to follow.

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

Administrators are advised to monitor affected systems.

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

 
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.

 
Alert History
 

Initial Release



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

Primary Products:
Microsoft, Inc.Internet Explorer 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 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




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