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capture the flag

A collection of 8 posts

CSAW Write-Up: shell->code

CSAW Write-Up: shell->code

It's been a few weeks since me and the Mechasheep played CSAW, but that doesn't mean there's nothing left to write about. The first and easiest pwn challenge I encountered during the competition was called shell->code, a baby-class challenge. The simplicity of

CSAW Write-up: Turtles

CSAW Write-up: Turtles

This past weekend, me and my team played CSAW CTF after taking quite a long break. We managed to hold top-20 for a good portion of the competition, even going as high as 12th place. Even though we lost our breath by the final day and finished in 40th, I

PlaidCTF Write-up: Shop

PlaidCTF Write-up: Shop

To warm up for DEFCON quals, my team and I decided to give PlaidCTF a shot. We knew it was going to bring some hard, fun challenges, and it did not disappoint. I immediately jumped into my comfort zone by tackling a pwn challenge, and got my first flag of

TUCTF Write-up: Temple of Malloc

TUCTF Write-up: Temple of Malloc

It's been a few months since me and my team started practicing CTF again, and we finally played in a live CTF over the weekend. It was a a fun CTF, and we actually managed to place above PPP with a team of only three people. I mean,

Pwnables Write-up: FSB

Pwnables Write-up: FSB

I'm on vacation in Mexico this week, which essentially means blow off pool time and hack stuff. I decided a relatively simple challenge would be a good starting point for the week, since I've never CTFed on this laptop and I was expecting to be constantly

Pwnables Write-up: Note

Pwnables Write-up: Note

And there goes another night spent honing my CTF skills. This time, I decided to tackle pwnables [http://pwnable.kr] Note challenge for 200 points. > Check out my SECURITY PATCH for mmap(). despite no-ASLR setting, it will randomize memory layout. so it will contribute for exploit mitigation. wanna try

Pwnables Write-up: Malware

Pwnables Write-up: Malware

Recently, me and Vadim [https://twitter.com/vadimkotov] decided to tag-team a 500 point challenge on pwnable [http://pwnable.kr] called malware: I have no respect for writing malware but I do have respect for writing cool malware lets find a way to beat ANUBIS (https://anubis.iseclab.org) download

Pwnables Write-ups (October 2017)

Pwnables Write-ups (October 2017)

It's been nearly a year since I played my last competitive Capture The Flag (CTF); life has kept me busy and I haven't had time to practice much. Recently, me and a buddy decided to start practicing again so that we could get back to competing