Flaw in ISA Server Could Allow CSS Attack

By Thomas McGuire on
Affected Software:
Microsoft Internet Security & Acceleration (ISA) Server 2000

ISA Server contains a number of HTML-based error pages that allow the server to respond to a client requesting a Web resource with a customized error. A cross-site scripting vulnerability exists in many of these error pages that are returned by ISA Server under specific error conditions.

To exploit this flaw, an attacker would have to first be aware of a specific ISA server & its access policies or host an ISA server of their own & create specific access policies designed to exploit this vulnerability. The attacker could then craft a request to trigger a page refusal. Once the attack was crafted, the attacker would have to host a Web site containing the link, or send the link to the user in the form of an HTML e-mail. After the user previewed or opened the e-mail, the malicious site could be visited automatically without further user interaction. In the Web-based attack scenario, an attacker would have no way to force a user to visit the Web site.

Patch availability
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