Codehead's Corner
Random ramblings on hacking, coding, fighting with infrastructure and general tech
Posted: 5 Sep 2016 by Codehead
2 minute read

I almost missed the Tokyo Westerns CTF. I stumbled across the event on the last day and wasn’t able to spend too long on it. I managed a few of challenges, mainly the PPC category. However, I wanted to write up the ‘Glance’ image manipulation challenge for future reference.

Challenge

I saw this through a gap of the door on a train.


Categories: Hacking CTF
Posted: 21 Aug 2016 by Codehead
12 minute read

The LabyREnth competition ran from 15th July to 14th Aug. I only managed to find time to do the first Windows challenge. It was a tricky one and I was only able to work at it in fits and starts, often with days or weeks between sessions. However, I learnt quite a few handy new things while working on it, so I’m writing this as a reference for myself and as an example of the dead-ends and rabbit holes of the analysis process for those who are interested.


Categories: Hacking CTF
Posted: 17 Apr 2016 by Codehead
2 minute read

Challenge:

Welcome to Vertinet.

This problem follows the same specifications as the previous Verticode problem, except that you have to solve many of them by developing a client to communicate with the server available at problems1.2016q1.sctf.io:50000. Good luck.


Categories: Hacking CTF
Posted: 17 Apr 2016 by Codehead
3 minute read

This was a nice little challenge from sCTF 2016. I’m trying to work on more tricky stuff, but this one looked like fun and I couldn’t resist.

Challenge:

Welcome to Verticode, the new method of translating text into vertical codes.


Categories: Hacking CTF
Posted: 27 Mar 2016 by Codehead
7 minute read

I only managed one task in the 2016 VolgaCTF, but it was a fun one. Coding a tic tac toe bot.

Challenge:

Tic-Tac-Toe

An important step towards the strong AI is the ability of an artificial agent to solve a well-defined problem. 
A project by the name 'tic-tac-toe' was one of such test problems. It's still up...

nc tic-tac-toe.2016.volgactf.ru 45679

Categories: Hacking CTF
Posted: 21 Feb 2016 by Codehead
3 minute read

Challenge:

File Checker (rev60)

Description:

My friend sent me this file. He told that if I manage to reverse it, I’ll have access to all his devices. My misfortune that I don’t know anything about reversing :/


Categories: Hacking CTF
Posted: 21 Feb 2016 by Codehead
2 minute read

Challenge:

FlagStore (exp70)

Description:

Here’s the ultimate flag store. Store and retrieve your flags whenever you want.


Categories: Hacking CTF
Posted: 21 Feb 2016 by Codehead
2 minute read

Challenge:

It’s Prime Time! (code60)

Description: We all know that prime numbers are quite important in cryptography. Can you help me to find some?

Service: 188.166.133.53:11059

Solution:

Running netcat against the address gave the following output:

> nc 188.166.133.53 11059
Hi, you know that prime numbers are important, don't you? 
Help me calculating the next prime!
Level 1.: Find the next prime number after 5:

Categories: Hacking CTF
Posted: 21 Feb 2016 by Codehead
2 minute read

I haven’t done much work with Ruby, but this little challenge from the Internetwache CTF looked interesting.

Challenge:

Ruby’s count (exp50)

Description: Hi, my name is Ruby. I like converting characters into ascii values and then calculating the sum.

Service: 188.166.133.53:12037

Solution

The first thing to do was to poke the service using netcat:

> nc 188.166.133.53 12037
Let me count the ascii values of 10 characters:
> 123
WRONG!!!! Only 10 characters matching /^[a-f]{10}$/ !

Categories: Hacking CTF
Posted: 7 Feb 2016 by Codehead
3 minute read

A nice little Stego challenge from SharifCTF

Challenge:

We have hidden a message in png file using jar file. Flag is hidden message. Flag is in this format:

SharifCTF{flag}

Files:

cheetah.tar.gz

Extracting the supplied tar.gz archive provided a PNG image:

AsianCheetah

Also included was Hide.jar, the Java code used to embed the flag in the image.


Categories: Coding CTF Hacking
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