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Vulnerability Alert

Microsoft Internet Explorer Cascading Style Sheets Remote Code Execution Vulnerability

 
Threat Type:CWE-94: Code Injection
IntelliShield ID:19468
Version:5
First Published:2009 November 22 18:51 GMT
Last Published:2009 December 10 16:33 GMT
Port: Not available
CVE:CVE-2009-3672
BugTraq ID:37085
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Moderate Damage
CVSS Base:9.3 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:7.3
Related Resources:
View related IPS SignatureView related Applied Mitigation Bulletin
 
 
Version Summary:

Additional technical information that describes the Microsoft Internet Explorer Cascading Style Sheets remote code execution vulnerability is available.

 
 
Description

Microsoft Internet Explorer versions 6 and 7 contain a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition or execute arbitrary code.

The vulnerability is due to an error by the Microsoft HTML Viewer.? The attacker could exploit this vulnerability by enticing a user to visit a malicious website.? Visiting the site could cause Internet Explorer to become unresponsive or possibly execute arbitrary code in the context of the current user.

Proof-of-concept code is publicly available.

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

 
Warning Indicators

Microsoft Internet Explorer versions 6 and 7 are vulnerable.

 
IntelliShield Analysis

An attacker cannot exploit this vulnerability directly and must rely on social engineering tactics to entice a user to view a malicious site.? Attackers may provide links to users via e-mail messages or post links on public websites.

If an exploit is successful, the attacker could execute arbitrary code on the system with the privileges of the user.? On systems where users run applications as the Administrator account, the attacker could execute code that could result in complete system compromise.? Systems that limit user privileges may have a reduced impact as the result of an exploit because any executed code would run in a restricted security context.

Initial reports from sources indicate that the publicly released proof-of-concept code is not very reliable.? Attempted exploits may fail, preventing exploitation.? However, reports caution that a fully functional, more reliable version could be constructed in the future.

Cisco has released an Applied Mitigation Bulletin to address vulnerabilities from Microsoft security bulletin 977981 that can be identified or mitigated using Cisco devices: Cisco Applied Mitigation Bulletin: Understanding Cross-Site Scripting (XSS) Threat Vectors

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

 
Vendor Announcements

Microsoft has released a security bulletin at the following link: MS09-072

US-CERT has released a vulnerability note at the following link: VU#515749

 
Impact

An unauthenticated, remote attacker could exploit this vulnerability to cause a DoS condition or execute arbitrary code on the vulnerable system with the privileges of the user.? If the user holds elevated privileges, the attacker could execute code that could result in complete system compromise.

 
Technical Information

This vulnerability is due to unsafe creation of memory buffer objects.  The CDispNode::SetExpandedClipRect function improperly calculates the size of input supplied from other functions, which could trigger memory corruption when input is copied to memory.

An unauthenticated, remote attacker could exploit the vulnerability by convincing a user to view a malicious web page designed to submit malicious input to Internet Explorer.  Successful exploitation could allow the attacker to execute arbitrary code with the privileges of the user.

 
Safeguards

Administrators are advised to apply the appropriate 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 to run applications with the least necessary privileges.

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 may consider disabling JavaScript in the vulnerable applications.

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.

 
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
22579/0Internet Explorer CSS Remote Code ExecutionS5182010 Oct 05 
22740/0HTML Object Memory CorruptionS4542009 Dec 08 
28379/0Internet Explorer Style Object Remote Code ExecutionS5082010 Aug 16 
28379/1Internet Explorer Style Object Remote Code ExecutionS5202010 Oct 16 
28379/2Internet Explorer Style Object Remote Code ExecutionS5082010 Aug 16 
 
Alert History
 

Version 4, December 8, 2009, 2:22 PM: Microsoft has released a security bulletin and updated software to address the Cascading Style Sheets remote code execution vulnerability in Internet Explorer.? US Cert has also issued a vulnerability note.

Version 3, November 24, 2009, 2:40 PM: Cisco has released an Applied Mitigation Bulletin to address the Cascading Style Sheets remote code execution vulnerability in Internet Explorer.

Version 2, November 24, 2009, 10:36 AM:? Microsoft has released a security advisory to address the Cascading Style Sheets remote code execution vulnerability in Internet Explorer.

Version 1, November 22, 2009, 1:51 PM: Microsoft Internet Explorer contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition or execute arbitrary code.? 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, SP1, SP2 | 7.0 Base

Associated Products:
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




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