Tags: reversing 

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Please, do not write just a link to original writeup here.

Original writeup (https://github.com/ktecv2000/CTF_writeup/tree/master/bugsbunnyctf/rev150).
BorgiJuly 31, 2017, 10:33 p.m.

buf[3] can't be zero because we have buf[11] / buf[3] == 0 : we can't devide by zero