This is a great find. SSRF is a really unappreciated vulnerability; it is usually game-over. That it came from a Caja audit adds some tasty irony.
A friendly word of advice: when you find flaws like this (you, the reader, not you, the guy who wrote this post), think carefully before disclosing internal network details you discover like this writer did. The internal details of a target network don't become public domain simply because you found a vulnerability. There are firms that get extremely itchy about this kind of stuff getting published, and I can't blame them.
A friendly word of advice: when you find flaws like this (you, the reader, not you, the guy who wrote this post), think carefully before disclosing internal network details you discover like this writer did. The internal details of a target network don't become public domain simply because you found a vulnerability. There are firms that get extremely itchy about this kind of stuff getting published, and I can't blame them.