Microsoft Forefront Unified Access Gateway contains a vulnerability that could allow an unauthenticated, remote attacker to conduct cross-site scripting attacks. Updates are available.
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 properly validating user-supplied input in 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.
Microsoft Forefront Unified Access Gateway 2010 Update 2 and prior are vulnerable.
The attacker cannot directly exploit this vulnerability without user interaction. The attacker must convince a user to follow a provided link, likely included in an e-mail or instant message delivered directly to the user. The attacker may also use social engineering techniques to make the user more interested in following the provided URL or more likely to trust the source of the link.
Microsoft has released a security bulletin at the following link: MS10-089
An unauthenticated, remote attacker could exploit this vulnerability to conduct a cross-site scripting attack and take actions in the application with the privileges of the user. An exploit could allow the attacker to retrieve sensitive information or spoof content in the application.
The vulnerability is due to errors in properly validating user-supplied input in URLs processed by the Forefront Unified Access Gateway Web Monitor component. The component may return unfiltered input received via URLs to the user's browser.
An unauthenticated, remote attacker could exploit this vulnerability by convincing a user to follow a link that is designed to pass malicious input to the affected application. When processed, the input could be returned and executed in the user's browser in the security context of the affected application. The execution of arbitrary script or HTML code could allow the attacker to take actions as the user on the site or capture sensitive browser-based information, such as recently submitted data or authentication credentials.
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.
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.
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