0CTF/TCTF 2021 Quals
11 challenges with 17 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 CTFtimeBinary exploitation5
Turn a memory-safety bug in a native binary into control of execution. Usually a stack overflow, a format string, or a heap primitive.
- heap
- pwn
- libc-2.31
Same technique in picoCTF: tea-cash, sice_cream, zero_to_hero
- musl-1.1.24
- pwn
- heap
Same technique in picoCTF: tea-cash, sice_cream, zero_to_hero
- tilegx
- pwn
Same technique in picoCTF: Guessing Game 1, x-sixty-what, format string 3
- kernel
- qemu
- pwn
- side-channel
Same technique in picoCTF: Guessing Game 1, x-sixty-what, format string 3
- pwn
- unicorn
- shellcode
Same technique in picoCTF: Binary Gauntlet 2, ropfu, solfire
Reverse engineering2
Work out what a compiled program does without its source, then work backwards from the check to the input that passes it.
- deserialization
- java
- rmi
- ssrf
Same technique in picoCTF: vault-door-1, vault-door-3, vault-door-4
- rev
- automation
Same technique in picoCTF: WinAntiDbg0x100, WinAntiDbg0x200, WinAntiDbg0x300
Misc2
Everything that fits no other box: esolangs, puzzles, scripting exercises, and the jail escapes that have not yet earned their own category.
- misc
Same technique in picoCTF: Permissions, Specialer, Codebook
- misc
Same technique in picoCTF: Permissions, Specialer, Codebook
Cryptography1
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.
- crypto
Same technique in picoCTF: StegoRSA, Timestamped Secrets, AES-ABC
Web1
Reach data or functionality the application meant to keep from you - through its inputs, its tokens, or its trust in the client.
- web
- php
Same technique in picoCTF: Client-side-again, dont-use-client-side, Irish-Name-Repo 3