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Wiki-like CTF write-ups repository by ByteBandits

Home Page: https://bytebandits.github.io/writeups/

Python 10.82% C 88.86% Go 0.03% C# 0.03% Java 0.12% HTML 0.08% JavaScript 0.04% Assembly 0.01% C++ 0.03%
ctf-writeups writeup ctf bytebandits cryptography reverse-engineering pwn

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writeups's Issues

Question

Sorry guys,
I've been trying this challenge but I cannot manage to get the flag, probably because the TCP connection is closed soon and rabbitmq isn't correctly grabbing the request.
I have tried adding a lot of null bytes and also adding a lot of GET request after the POST request with the new input to the queue in order to make the TCP connection last more. But it is not working.
What did you do? what is inside your payload_bak?
Thank you.

internetwache-ctf-2016 / Exploit80 (RemotePrinter) writeup

Hi,

Very interesting write-up with a shell, the only one with a shell. Nice job !
I wonder how you manage to guess the address of the stack ?
With %p%p%p... pattern, we can see it always start with 0xffffbcec. But I didn't understand how you conclude it's the 0x2000 bytes buffer address, so the input we can control.

I've done this exploit by simply overwrite 4 bytes of the close() entry in the GOT, but to call dead code displaying flag at address 0x08048867. More simple solution but far less efficient than yours in other circumstances !

Cheers,

Phil

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