2021weight 22.25SPRAVEDLIVAЯ RUSH A

SPRUSH CTF Quals 2021

4 challenges with 4 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 CTFtime

Reverse engineering2

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 blobs WebAssembly disassembler Java .class disassembler Python .pyc bytecode disassembler Learn: Binary exploitation

ASSembly
460 pts1 writeup
- virtual
- rev
Same technique in picoCTF: Forky, reverse_cipher, Easy as GDB
Revocryptoforensics
460 pts1 writeup
- rev
- crypto
- forensics
Same technique in picoCTF: WinAntiDbg0x100, WinAntiDbg0x200, WinAntiDbg0x300

Web1

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 verifier JWT alg=none bypass generator Web attack payload catalog JWT secret brute force Learn: Web attacks and session tokens

SecretTactics
500 pts1 writeup
- web
Same technique in picoCTF: Client-side-again, dont-use-client-side, Irish-Name-Repo 3

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 finder Shellcode assembler and library Cyclic pattern generator and offset finder Format string exploit builder Learn: Binary exploitation

babypwn
473 pts1 writeup
- seccomp
- bof
- ropchain
- pwn
Same technique in picoCTF: Guessing Game 1, x-sixty-what, handoff

Reverse engineering2

ASSembly

Revocryptoforensics

Web1

SecretTactics

Binary exploitation1

babypwn

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