DCTF - Exploitation 300

October 4th, 2015

Points: 300 Solves: Category: Exploitation Description:

e300

Write-Up

It’s a 64bit ELF stripped binary and the main function looks like this:

screen

Quite simple, but it requires some bruteforcing of the modulo result from rand().

The vulnerable function looks like this:

screen2

The exploitation process:

  • Hope this has been helpful to someone