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CSAW CTF Quals 2014

25 Sep

xorcise (exploit 500)


We've got the following binary and its source code: xorcise.

$ file xorcise
xorcise: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked 
(uses shared libs), for GNU/Linux 2.6.32, not stripped

Looking attentively at source code you can find this interesting moment in decipher function:

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