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Vulnerability Alert

Microsoft Forefront Unified Access Gateway Spoofing Vulnerability

 
Threat Type:
IntelliShield ID:21712
Version:1
First Published:2010 November 09 18:41 GMT
Last Published:2010 November 09 18:41 GMT
Port: Not available
CVE:CVE-2010-2732
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Harassment
CVSS Base:2.6 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:1.9
Related Resources:
View related IPS Signature
 
 
Version Summary:

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

 
 
Description

Microsoft Forefront Unified Access Gateway 2010 Update 2 and prior contains a vulnerability that could allow an unauthenticated, remote attacker to conduct spoofing attacks.

The vulnerability exists due to improper validation of 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 spoofing attack that could allow the attacker to capture user authentication credentials.

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 exploit this vulnerability, the attacker would have to convince the user to view a malicious website.  The attacker may provide links to the user within e-mail or instant messages, along with content instructing the user to follow the provided link.  In most spoofing exploits, the attacker also depends on the user to further interact with the malicious website by entering sensitive information.  If successful, the attacker could capture user credentials for use in further exploits.

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 redirect users from the application to a third-party website without the user's knowledge, possibly aiding the attacker in spoofing attempts.

 
Technical Information

The vulnerability exists due to improper validation of URLs that redirect users from the Forefront Unified Access Gateway (UAG) to third-party sites.

An unauthenticated, remote attacker could exploit this vulnerability by convincing a user to follow a malicious URL.  The URL could be constructed in such a way that the user would first access the UAG interface and then redirect to a third-party website without the user's knowledge, assisting in a spoofing attack. 

To expand upon the exploit, the attacker could construct the untrusted website in such a way to mimic the UAG interface, prompting the user to enter credentials normally used to log in to the UAG application.  If successful, the spoofing attack could allow the attacker to capture a user's authentication credentials.

 
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
31219/0Microsoft Forefront Unified Access Gateway Redirection AttackS5292010 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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