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Every CTF
2024picoctfsolutions.compicoCTF

picoCTF 2024

47 challenges with 47 published solutions between them. Solution links go to picoctfsolutions.com, which is the only writeup source this index uses for picoCTF - one worked solution per challenge, rather than an aggregate of other people’s posts.

Every writeup on picoctfsolutions.com

Binary exploitation10

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

  • babygame03

    1 writeup
    • buffer-overflow
    • path-traversal

  • format string 0

    1 writeup
    • format-string
    • buffer-overflow

  • format string 1

    1 writeup
    • format-string

  • format string 2

    1 writeup
    • format-string
    • arbitrary-write

  • format string 3

    1 writeup
    • format-string
    • got-overwrite
    • pie-bypass

  • heap 0

    1 writeup
    • heap-exploitation
    • heap-overflow

  • heap 1

    1 writeup
    • heap-exploitation
    • heap-overflow

  • heap 2

    1 writeup
    • heap-exploitation
    • use-after-free

  • heap 3

    1 writeup
    • heap-exploitation
    • use-after-free

  • high frequency troubles

    1 writeup
    • heap-exploitation
    • heap-overflow

Misc10

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

Forensics8

Recover something from a file, a capture, or a disk image - often from a part of it the format says is unused.

Solve it with:File type identifier by magic bytesMagic byte and file signature tablePCAP analyzer for CTF network forensicsEXIF metadata viewerLearn: File forensics and carvingLearn: Network forensics

Web7

Reach data or functionality the application meant to keep from you - through its inputs, its tokens, or its trust in the client.

Solve it with:JWT decoder and signature verifierJWT alg=none bypass generatorWeb attack payload catalogJWT secret brute forceLearn: Web attacks and session tokens

Reverse engineering7

Work out what a compiled program does without its source, then work backwards from the check to the input that passes it.

Solve it with:Strings extractor for binaries and blobsWebAssembly disassemblerJava .class disassemblerPython .pyc bytecode disassemblerLearn: Binary exploitation

  • Classic Crackme 0x100

    1 writeup
    • crackme
    • password-bypass

  • FactCheck

    1 writeup
    • binary-analysis
    • strings

  • packer

    1 writeup
    • unpacking

  • weirdSnake

    1 writeup
    • python-bytecode
    • python-reversing

  • WinAntiDbg0x100

    1 writeup
    • anti-debugging
    • windows
    • decompilation

  • WinAntiDbg0x200

    1 writeup
    • anti-debugging
    • windows
    • decompilation

  • WinAntiDbg0x300

    1 writeup
    • anti-debugging
    • windows
    • decompilation

Cryptography5

Recover a plaintext or a key from something that was supposed to protect it. In practice: identify the scheme, find the parameter the author got wrong, exploit it.

Solve it with:Cipher identifier and automatic decoderVigenere cipher solver with automatic key recoveryRSA decryption and attack runnerWiener’s attack on small RSA private exponentsIn-browser hash cracker with rule transformsLearn: Classical ciphers and frequency analysisLearn: RSA and the parameters that break it

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