2017weight 25.00Vidar

HCTF 2017

5 challenges with 6 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

Web3

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

A World Restored
1000 pts1 writeup
- web
Same technique in picoCTF: Client-side-again, dont-use-client-side, Irish-Name-Repo 3
A World Restored Again
1000 pts1 writeup
- web
Same technique in picoCTF: Client-side-again, dont-use-client-side, Irish-Name-Repo 3
Deserted place
1000 pts1 writeup
- web
Same technique in picoCTF: Client-side-again, dont-use-client-side, Irish-Name-Repo 3

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

babycrack
1000 pts2 writeups
- re
- web
Same technique in picoCTF: WinAntiDbg0x100, WinAntiDbg0x200, WinAntiDbg0x300
Evr_Q
1000 pts1 writeup
- re
Same technique in picoCTF: WinAntiDbg0x100, WinAntiDbg0x200, WinAntiDbg0x300

Web3

A World Restored

A World Restored Again

Deserted place

Reverse engineering2

babycrack

Evr_Q

Other 2017 events