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Netegrity SiteMinder Authentication Bypass Vulnerability

Netegrity's SiteMinder software is designed to provide access control to webpages at the server. It is possible, with a specially modified URL, for unauthenticated clients to gain read and/or execute access to protected content.

If the URL is modified by adding the string '/$/nonexistantfile.ext' after the desired URL, the server will pass the requested content without prompting for or requiring any authentication whatsoever. The extension of the non-existant file is checked, and so far only .ccc, .class, and .jpg have been proven to work.

If the restricted content is a cgi application, variable values are specified after the added string. If no values are specified, the server will return the source of the cgi.