2025weight 95.79bi0s
bi0sCTF 2025
3 challenges with 3 published community solutions between them. Solution links go to CTFtime’s task page, which aggregates every writeup for a challenge - individual blog posts rot, the aggregator does not.
Full task list on CTFtimeMisc2
Everything that fits no other box: esolangs, puzzles, scripting exercises, and the jail escapes that have not yet earned their own category.
Solve it with:Brainfuck and esolang decoderCipher identifier and automatic decoderRegex tester with match offsets and capture groupsLearn: Recognising encodings
- ml
- misc
- adversarial
- audio
Same technique in picoCTF: Permissions, Specialer, Codebook
Same technique in picoCTF: Permissions, Specialer, Codebook
Binary exploitation1
Turn a memory-safety bug in a native binary into control of execution. Usually a stack overflow, a format string, or a heap primitive.
Solve it with:ROP gadget finderShellcode assembler and libraryCyclic pattern generator and offset finderFormat string exploit builderLearn: Binary exploitation
- secp256k1
- pwn
- crypto
- heap
- android
Same technique in picoCTF: tea-cash, sice_cream, zero_to_hero