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Template Virtualisation Obfuscation
Today I’ll be discussing an interesting challenge from the rev category of University of Maryland Capture The Flag 2024. The challenge is named Typecheck and is accompanied by the cryptic description “My C++ code won’t type check. Can you fix that for me?”. Two files are provided: main.cpp and templates.cpp....
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Travel the Dunes with OCaml
This post is a write up of the Travel the Dunes with OCaml challenge from the rev category of University of Maryland Capture The Flag 2024. The challenge provides a file, ocaml_executable and states that it is “a flag checker compiled and assembled from OCaml using ocamlopt”. Loading it into...
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Hand Crafted Artisan Compiled Binary
This post describes the cmsc430 challenge by aparker, in the rev category of University of Maryland Capture The Flag 2024. The challenge provides a single binary, chal, which the author states “was compiled by an hand-crafted, artisan racket compiler”. Die tells us it was a C/C++ program compiled by GCC....
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Bankrupting Bezos: Donations CTF Challenges
This post describes the Donations and Donations (but I fixed it) challenges by tahmid-23 in the web category of University of Maryland Capture The Flag 2024. Donations Starting off with the first challenge, when we visit the provided website we are met with: The message Welcome to donations. Can you...