Vulnerability Alert

Microsoft Windows .lnk File Processing Arbitrary Code Execution Vulnerability

 
Threat Type:IntelliShield: Applied Mitigation Bulletin
IntelliShield ID:20918
Version:5
First Published:2010 July 19 16:38 GMT
Last Published:2010 September 11 04:49 GMT
Port: Not available
CVE:CVE-2010-2568
BugTraq ID:41732
Urgency:Possible use
Credibility:Confirmed
Severity:Moderate Damage
CVSS Base:9.3 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:8.1
 
Version Summary:

The CVSS score for this alert has been modified to reflect higher exploitability.  Information about the malware that exploits this vulnerability is also available.

 
 
Description

Microsoft Windows contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code on the targeted system.

The vulnerability exists because the affected operating systems incorrectly process .lnk files.  An unauthenticated, remote attacker could exploit the vulnerability by including a crafted .lnk file on local drives or on a remote shared web resource and then persuading a user to browse to the directory of this .lnk file.  Successful exploitation could allow the attacker to execute arbitrary code.

A functional exploit that is a part of the Metasploit framework is publicly available.

Microsoft has confirmed this vulnerability and released updated software.

 
Warning Indicators

Information about the affected products is available?from the vendor advisory in the Vendor Announcements section of this alert.

 
IntelliShield Analysis

Reports suggest that this vulnerability is being exploited in the wild via the stuxnet botnet.  This malware reportedly targets industrial control systems.  Further information about the malware that exploits the vulnerability is available in IntelliShield Alert 20915.

A functional exploit that is a part of the Metasploit framework demonstrates exploitation of this vulnerability, wherein the crafted .lnk file could link to a WebDAV share.  As a result, an attacker could reference any remote web resource and the control of malware is not confined to local drives.  This factor could make the exploit much easier and is more likely to be used as an attack vector because the attacker does not need to ensure that malicious code exists on the targeted system.

Reports suggest that documents and web pages embedded with .lnk files could be used as an attack vector to exploit this vulnerability.

Limited user interaction is needed to exploit the vulnerability.  By default, Microsoft Windows systems have the AutoRun/AutoPlay features enabled for USB media that could cause Windows Explorer to automatically open the location of the crafted .lnk file, reducing user interaction to simply inserting the USB media on a system.  This factor could increase the impact of this vulnerability. 

 
Vendor Announcements

Microsoft has released a security bulletin at the following link: MS10-046

Microsoft has re-released a security advisory at the following link: 2286198

US-CERT has released a vulnerability note at the following link: VU#940193

 
Impact

An unauthenticated, remote attacker could exploit this vulnerability to execute arbitrary code on the targeted system.? The arbitrary code would execute in the context of the user who is logged in.? If the user is logged in as Administrator, the attacker could take complete control of the affected system.

 
Technical Information

The vulnerability is in the Windows Shell component of the Microsoft Windows operating system as a result of incorrect processing when acquiring icons for .lnk files.?

An unauthenticated, remote attacker could exploit the vulnerability through a malicious .lnk file on local drives or a Web-based Distributed Authoring and Versioning (WebDAV) resource and persuading a targeted user to browse to the location of this file using a file manager such as Windows Explorer.? The crafted .lnk file could specify a path name to locally stored or remotely hosted executable files that could be automatically executed.? A successful exploit could allow the attacker to execute arbitrary code by means of the file to which this crafted .lnk file is linked.

 
Safeguards

Administrators are advised to apply the appropriate updates.

Administrators are advised to configure antivirus software to scan media upon insertion.?

Administrators may also consider disallowing USB drives or other removable media from sensitive environments.

Users are advised not to plug in USB drives from unknown sources.

 
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
2503/0Generic EXE File DownloadS7282013 Jul 18 
2503/1Generic EXE File DownloadS7282013 Jul 18 
27839/0Windows LNK File Code ExecutionS6582012 Jul 19 
27839/1Windows LNK File Code ExecutionS5032010 Jul 27 
27839/2Windows LNK File Code ExecutionS5622011 Apr 27 
27839/3Windows LNK File Code ExecutionS5622011 Apr 27 
27839/4Windows LNK File Code ExecutionS6582012 Jul 19 
27839/5Windows LNK File Code ExecutionS7282013 Jul 18 
 
Alert History
 

Version 4, August 2, 2010, 2:22 PM: Microsoft has released a security bulletin and updates to address the Windows .lnk file processing arbitrary code execution vulnerability.

Version 3, July 21, 2010, 11:45 AM: Microsoft has re-released a security bulletin with updated workarounds and additional information about attack vectors used to exploit the Microsoft Windows .lnk file processing arbitrary code execution vulnerability.

Version 2, July 20, 2010, 11:13 AM: A Metasploit functional exploit demonstrates exploitation of the Microsoft Windows .lnk file processing arbitrary code execution vulnerability via a remote WebDAV share.

Version 1, July 19, 2010, 12:38 PM: Microsoft Windows contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code.  Updates are not available.



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

Primary Products:
Microsoft, Inc.Windows 7 for 32-bit systems Base | for x64-based systems Base
Microsoft, Inc.Windows Server 2003 Datacenter Edition Base, SP2 | Datacenter Edition, 64-bit (Itanium) Base, SP2 | Datacenter Edition x64 (AMD/EM64T) Base, SP2 | Enterprise Edition Base, SP2 | Enterprise Edition, 64-bit (Itanium) Base, SP2 | Enterprise Edition x64 (AMD/EM64T) Base, SP2 | Standard Edition Base, SP2 | Standard Edition, 64-bit (Itanium) Base, SP2 | Standard Edition x64 (AMD/EM64T) Base, SP2 | Web Edition Base, SP2
Microsoft, Inc.Windows Server 2008 Datacenter Edition Base, SP2 | Datacenter Edition, 64-bit Base, SP2 | Itanium-Based Systems Edition Base, SP2 | Enterprise Edition Base, SP2 | Enterprise Edition, 64-bit Base, SP2 | Essential Business Server Standard Base, SP2 | Essential Business Server Premium Base, SP2 | Essential Business Server Premium, 64-bit Base, SP2 | Standard Edition Base, SP2 | Standard Edition, 64-bit Base, SP2 | Web Server Base, SP2 | Web Server, 64-bit Base, SP2
Microsoft, Inc.Windows Server 2008 R2 x64-Based Systems Edition Base | Itanium-Based Systems Edition Base
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, SP3 | Professional Edition Base, SP3 | Professional Edition, 64-bit (Itanium) Base, SP2 | Professional x64 (AMD/EM64T) Base, SP2

Associated Products:
N/A




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