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Vulnerability Alert

Microsoft Forefront Unified Access Gateway signurl.asp Cross-Site Scripting Vulnerability

 
Threat Type:CWE-79: Cross-Site Scripting (XSS)
IntelliShield ID:21715
Version:1
First Published:2010 November 09 18:38 GMT
Last Published:2010 November 09 18:38 GMT
Port: Not available
CVE:CVE-2010-3936
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:4.3 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:3.2
 
Version Summary:

Microsoft Forefront Unified Access Gateway contains a vulnerability that could allow an unauthenticated, remote attacker to conduct cross-site scripting attacks.  Updates are available.

 
 
Description

Microsoft Forefront Unified Access Gateway 2010 Update 2 and prior contain a vulnerability that could allow an unauthenticated, remote attacker to conduct cross-site scripting attacks.

The vulnerability is due to errors in processing input supplied to the signurl.asp script via URLs.  An unauthenticated, remote attacker could exploit the vulnerability by convincing the user to view a malicious link.  If successful, the attacker could conduct a cross-site scripting attack and capture sensitive browser-based information.

Microsoft has confirmed the vulnerability in a security bulletin and released software updates.

 
Warning Indicators

Microsoft Forefront Unified Access Gateway 2010 Update 2 and prior is vulnerable.

 
IntelliShield Analysis

To achieve a successful exploit, the attacker must convince a user to follow a malicious link.  Attackers may provide links to users in e-mail or instant messages or by posting links on public websites.  Attackers may use obfuscation techniques to make malicious URLs more difficult to recognize and may use social engineering techniques to make users more likely to follow a provided link.

The Cisco Applied Intelligence team has created an Applied Mitigation Bulletin to address vulnerabilities that Microsoft disclosed in the November 2010 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 November 2010

 
Vendor Announcements

Microsoft has released a security bulletin at the following link: MS10-089 

 
Impact

An unauthenticated, remote attacker could exploit this vulnerability to execute arbitrary script or HTML code in the user's browser in the security context of the targeted site, possibly allowing the attacker to take actions on the site as the user or access sensitive browser-based information.

 
Technical Information

The vulnerability is due to errors in processing input supplied to the signurl.asp script via URLs.  The script fails to properly sanitize supplied input before returning the input to the user.

An unauthenticated, remote attacker could exploit this vulnerability by convincing a user to follow a URL that is designed to submit malicious input to the application.  When followed, the URL could direct the user to the vulnerable application and cause the application to return unfiltered input to the user's browser.  When rendered in the user's browser, the input could allow the attacker to execute arbitrary script or HTML code in the user's browser in the security context of the affected site.

 
Safeguards

Administrators are advised to apply the appropriate software updates.

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.

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 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
31399/0Microsoft Forefront Unified Access Gateway VulnerabilityS5292010 Nov 09 
 
Alert History
 

Initial Release



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

Primary Products:
Microsoft, Inc.Forefront Unified Access Gateway 2010 Base, Update 1, Update 2

Associated Products:
N/A




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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.
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