Defcon 2015 Quals - Babyecho Writeup

This write-up is made by boogy of the Fourchette Bombe ctf team This was an cool challenge which was worth 1 point. But nevertheless we enjoyed solving it. The binary is 32bit and striped:

$ file babyecho_eb11fdf6e40236b1a37b7974c53b6c3d
babyecho_eb11fdf6e40236b1a37b7974c53b6c3d: ELF 32-bit LSB  executable, Intel 80386, version 1 (SYSV), statically linked, for …
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Defcon 2015 Quals - babycmd writeup

We are given the folowing information and a binary to download:

babycmd_3ad28b10e8ab283d7df81795075f600b.quals.shallweplayaga.me:15491

$ file babycmd_3ad28b10e8ab283d7df81795075f600b
babycmd_3ad28b10e8ab283d7df81795075f600b: ELF 64-bit LSB  shared object, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.24, stripped

And lets make a checksec also:

$ checksec.sh --file …
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Defcon 2015 Quals - mathwhiz solution

Category: Baby's First Points: 1

The information given to us:

mathwhiz_c951d46fed68687ad93a84e702800b7a.quals.shallweplayaga.me:21249

After connecting to it we can see it's giving us mathematical operations and he's waiting for the result. The solution is pretty easy. Get the data and pass it to python eval and return the …

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