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The Elf Resources department needs to keep an eye on what the elves are doing. This site was done in a hurry and they would appreciate if you would take a look. This is the description of Elf Resources, an easy-to-medium difficulty web challenge from the X-MAS CTF 2022. For this challenge, we have to go blind and adopt a black-box approach as we don't have the source code of the application or other information that can be useful. The attack surface is very restricted: we are presented with three different buttons requesting three snowmen and nothing else. There are no comments or helpful information inside the source code, neither cookies nor JWT. It is quite obvious that the most reasonable entry point is the snowman id, so we can try to play with that parameter and analyze the application behavior. Providing to the application some ids that do not exist in the database we can see that it returns some internal errors. Trying to perform some arithmetical calculations, however, someth...
