CBCTF2019

CODE BLUE CTF 2019 Key_check (crypto + pwn)

Summary

Pwnable part

canaray leak + stack overflow + One gadget RCE (or short ROP using libc)

Crypto part:

(255/256)^576 = 0.1049... + Using RSA ciphertext to write the ROP chain.

Notice

Source code (20190921.c) and Dockerfile were not provided during the CTF.
exploit.py has some bugs and the success rate is 80-90%.