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    Honeypot Processors: Hidden Link Processor: Incident - Link Directory Spidering

    Complexity: Low (2.0)

    Default Response: 1x = Slow Connection 2-6 seconds and 5 day Block in 6 minutes.

    Cause: WebApp Secure injects a hidden link into pages on the protected web application. This link is not exposed visually to users of the website. In order to find the link, a user would need to manually inspect the source code of the page. If a user finds the hidden link code in the HTML, and attempts to request some other arbitrary file in the same fake directory as the link, this incident will be triggered.

    Behavior: A common technique for hackers when scoping the attack surface of a website is to spider the site and collect the locations of all of its pages. This is generally done using a simple script that looks for URL's in the returned HTML of the home page, then requests those pages and checks for URL's in their source, and so forth. Legitimate search engine spiders will do this as well. But the difference between a legitimate spider and a malicious user, is how aggressively they will use the newly discovered URL to derive other URLs. This incident triggers when the user goes beyond just checking the linked URL, but instead also attempts to request one or more arbitrary files inside the same directory as the file referenced by the hidden link. A legitimate spider would not do this, because it is considered fairly invasive. This activity is generally looking for a "Directory Indexing" weakness on the server, or a "Predictable Resource Location" vulnerability, in an effort to locate unlinked and possibly sensitive resources.

    Note: For information on the attack types mentioned here, go to The Web Application Security Consortium Web Site and search for the attack name to learn more about it.

    Published: 2014-06-27