Web Hack List

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How to defeat digg.com

A walkthrough of session riding (CSRF) against digg.com. A zero-size iframe is filled by JavaScript with a POST form, and because IE and Firefox send no Referer for a frame built by script, referer checks fail; only Opera resists. The page itself diggs a story on load as the demo. The fix given is a single-use token in every form and link.

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