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Every CTF
2019picoctfsolutions.compicoCTF

picoCTF 2019

86 challenges with 86 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

Reverse engineering21

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

Forensics21

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

Cryptography15

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

Misc14

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

Web12

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

  • Client-side-again

    1 writeup
    • source-inspection
    • javascript-deobfuscation

  • dont-use-client-side

    1 writeup
    • source-inspection
    • javascript-deobfuscation

  • Insp3ct0r

    1 writeup
    • source-inspection

  • Irish-Name-Repo 1

    1 writeup
    • sql-injection

  • Irish-Name-Repo 2

    1 writeup
    • sql-injection

  • Irish-Name-Repo 3

    1 writeup
    • sql-injection
    • authentication-bypass

  • Java Script Kiddie

    1 writeup
    • source-inspection
    • encoding

  • Java Script Kiddie 2

    1 writeup
    • source-inspection
    • encoding

  • JaWT Scratchpad

    1 writeup
    • jwt

  • logon

    1 writeup
    • cookie-manipulation
    • authentication-bypass

  • picobrowser

    1 writeup
    • http-headers

  • where are the robots

    1 writeup
    • source-inspection
    • robots-txt

Binary exploitation3

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

  • seed-sPRiNG

    1 writeup
    • prng
    • buffer-overflow

  • sice_cream

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

  • zero_to_hero

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

Other 2019 events