Products & Services
Support

Product Categories


Popular Downloads


Manage Software

How to Buy

For Home

Linksys Products Store
Linksys is now part of Belkin
Products for everyone

All Ordering Options

Training & Events Partners
Guest

Vulnerability Alert

Microsoft Windows JavaScript Engine Arbitrary Code Execution Vulnerability

 
Threat Type:CWE-94: Code Injection
IntelliShield ID:18969
Version:2
First Published:2009 September 08 20:11 GMT
Last Published:2009 September 09 18:11 GMT
Port: Not available
CVE:CVE-2009-1920
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Moderate Damage
CVSS Base:9.3 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:6.9
Related Resources:
View related IPS Signature
 
 
Version Summary:

Additional technical information is available regarding the Microsoft Windows JavaScript engine arbitrary code execution vulnerability.

 
 
Description

Microsoft Windows contains a vulnerability in the JavaScript rendering engine that could allow an unauthenticated, remote attacker to execute arbitrary code with the privileges of the user.

The vulnerability is due to errors in decoding malformed scripts by the JavaScript rendering engine.? An unauthenticated, remote attacker could exploit this vulnerability by convincing a user to view a malicious website.? If the user views the site, the attacker could execute arbitrary code with the privileges of the user.

Microsoft has confirmed this vulnerability in a security bulletin and released software updates that correct it.

 
Warning Indicators

Systems running the following versions of Microsoft Windows are affected:

  • Windows 2000 SP4 and prior??
  • 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 for Itanium-based Systems SP2 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
 
IntelliShield Analysis

Attackers cannot directly exploit this vulnerability and instead must rely on user participation to accomplish an exploit.? An attacker must convince a user to view a malicious website, likely by providing links to the user in e-mail messages.? Attackers may also include malicious content on public or compromised websites to accomplish an exploit, but an attacker could not force the user to view the malicious content.? Attackers may use social engineering techniques to convince users to view malicious websites, possibly by convincing the user that the source of a URL or website is trusted.

Windows Server 2003 and Windows Server 2008 systems are less at risk because Internet Explorer runs in the Enhanced Security Configuration mode on these systems.? Additionally, users on Windows Server systems may be less likely to browse to untrusted, external websites.

End-user systems, such as those running Windows 2000, Windows XP, or Windows Vista, may be at greater risk because users may regularly visit unknown websites and run applications with elevated privileges.? An exploit that runs when the user holds elevated or Administrator privileges could allow the attacker to execute arbitrary code, resulting in a complete system compromise.

The Cisco Applied Intelligence team has created an Applied Mitigation Bulletin to address vulnerabilities that Microsoft disclosed in the September 2009 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 September 2009

The update available from Microsoft corrects this vulnerability by improving JavaScript decoding.

 
Vendor Announcements

Microsoft has released a security bulletin at the following link: MS09-045

 
Impact

An unauthenticated, remote attacker could exploit this vulnerability to execute arbitrary code with the privileges of the targeted user.? If that user holds elevated privileges, the attacker could completely compromise the vulnerable system.

 
Technical Information

The vulnerability is due to errors in decoding malformed scripts by the JavaScript rendering engine jscript.dll.  Memory corruption may occur as the result of loading malicious scripts into memory. The vulnerability exists in the handling of the jscript key word arguments.  It is possible to invoke this keyword before the arguments object has been created, which could lead to memory corruption.

An unauthenticated, remote attacker could exploit this vulnerability by convincing a user to view a web page that contains malicious JavaScript.  The processing of the malicious script could corrupt memory in a way that could allow the attacker to execute arbitrary code with the privileges of the user.

 
Safeguards

Administrators are advised to apply the available software updates.

Administrators may consider configuring Internet Explorer to prompt users before running Active Scripting or ActiveX controls by setting the Internet and Local Intranet security zone settings to High. Alternately, administrators could disable Active Scripting and ActiveX controls in these security zones.

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 to run applications with the least necessary privileges.

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.


Signatures
 
Cisco Intrusion Prevention System (IPS) 6.0
Signature IDSignature NameReleaseLatest Release Date
20699/0Microsoft JScript Scripting Engine VulnerabilityS4312009 Sep 08 
21420/0Microsoft Windows JScript Remote Code ExecutionS4422009 Oct 16 
 
Alert History
 

Version 1, September 8, 2009, 4:11 PM:? Microsoft Windows contains a vulnerability in the JavaScript rendering engine that could allow an unauthenticated, remote attacker to execute arbitrary code with the privileges of the user.? Updates are available.



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

Primary Products:
Microsoft, Inc.Windows 2000 Advanced Server Base, SP1, SP2, SP3, SP4 | Professional Base, SP1, SP2, SP3, SP4 | Server Base, SP1, SP2, SP3, SP4
Microsoft, Inc.Windows Server 2003 Datacenter Edition Base, SP1, SP2 | Datacenter Edition, 64-bit (Itanium) Base, SP1, SP2 | Datacenter Edition x64 (AMD/EM64T) Base, SP2 | Enterprise Edition Base, SP1, SP2 | Enterprise Edition, 64-bit (Itanium) Base, SP1, SP2 | Enterprise Edition x64 (AMD/EM64T) Base, SP2 | Standard Edition Base, SP1, SP2 | Standard Edition, 64-bit (Itanium) Base, SP1, SP2 | Standard Edition x64 (AMD/EM64T) Base, 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 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

Associated Products:
N/A




Alerts and bulletins on the Cisco Security Intelligence Operations Portal are highlighted by analysts in the Cisco Threat Operations Center and represent a subset of the comprehensive content that is available through Cisco Security IntelliShield Alert Manager Service. This customizable threat and vulnerability alert service provides security staff with access to timely, accurate, and credible information about threats and vulnerabilities that may affect their environment.


LEGAL DISCLAIMER
The urgency and severity ratings of this alert are not tailored to individual users; users may value alerts differently based upon their network configurations and circumstances. THE ALERT, AND INFORMATION CONTAINED THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION CONTAINED THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN RISK. INFORMATION IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME.
Powered by  IntelliShield