CTF

Various posts about information security competitions: writeups, tools, etc.

I attended the physical CTF NorthSec with my team 0-bae. NorthSec is held in Montréal every year and I have not missed it once since  its beginning 5 years ago. It is even more special for me because its first edition was the first CTF that I even attended. And it got me hooked. Four years […]

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I attended the online ctf CSAW with my university team PolyHack. The challenge’s portal did not give a lot of informations, most importantly that it was a Web challenge. Let’s dig in. We are presented a standard website with a few pages. Seeing the URL and the GET parameter “page”, I tested for LFI. For this classic payload, […]

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I participated in the CSAW quals 2015 CTF with the team PolyHack in september. The challenge Forensics 200 didn’t provide any description. We were only handed a zip file named airport_26321e6eac7a7490e527cbe27ceb68c1.zip. It was a standard zip file that did not contain anything other than the challenge. After unzipping it, we have two directories named for_release […]

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This challenge was the second challenge in the category Misc, which is a category mostly about trivia questions or programming skills. We were provided with an URL named “Flag is Here!” which pointed to a text file. The text file (~700 KB) consists of thousands of triplets of values between 0 and 255. By knowing […]

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