SANS Christmas Challenge 2020

Posted on lun. 11 janvier 2021 in Write-up


Oh, the COVID is frightful,

But KringleCon is so delightful,

And since we must all stay home,

Let it pwn! Let it pwn! Let it pwn!

Here's my write-up for the 2020 SANS Christmas Challenge.

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SANS Christmas Challenge 2019

Posted on mar. 14 janvier 2020 in Write-up


On the twelfth day of Christmas, my true love gave to me:

Twelve Phishers phishing

Eleven Shells a-popping

Ten Passwords spraying

Nine Splunks a-splunking

Eight Machines learning

Seven Metasploit scanning

Six Blue Teamers crying

Five Golden Tickets

Four Domain Hashes

Three Malicious Macros

Two LAN Turtles

and a Pwnage in …

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SANS Christmas Challenge 2018

Posted on lun. 14 janvier 2019 in Write-up


🎵 I'm dreaming of a pwned Christmaaaaas 🎵 As usual, here's my write-up for the 2018 SANS Christmas Challenge.

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SANS Christmas Challenge 2017

Posted on mer. 10 janvier 2018 in Write-up


'Tis the season to be pwning, falalalala lalalala. As usual, here's my write-up for the 2017 SANS Christmas Challenge.

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Meet beautiful XSS in your area: a YouPorn bug bounty [SFW]

Posted on mar. 28 mars 2017 in Bug bounty


I don't do bug bounties due to a lack of time. Although I have a HackerOne profile, you can see that I'm not so active. However, a coworker of mine spends quite some time on different bug bounty programs.

On 2017-02-06 evening, when we were both connected to our work …

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SANS Christmas Challenge 2016

Posted on jeu. 05 janvier 2017 in Write-up


This blog is beginning to look a lot like being exclusively about SANS Christmas Challenges write-ups. What can I say, they're so good! Anyway, let's roll for the 2016 edition of this marvelous Christmas Challenge.

Everything starts again with the Dosis children. As they're reminiscing on last year's Christmas, they …

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SANS Christmas Challenge 2015

Posted on sam. 09 janvier 2016 in Write-up


This year again, the SANS institute delights us with a wonderful Christmas Challenge.

We follow the Dosis family, after they purchase a Gnome in Your Home for their kids, Jessica and Joshua. These two kids, especially bright for their age, tinker with the gnome, to find that it has a …

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May the Cipher be with you

Posted on dim. 03 février 2013 in Cryptography


NB: I know that implementing cryptographic algorithms yourself is dangerous. There are many implementation problems people won't think about, like memory management. I just wanted to talk about the CipherSaber because I think it's an old, yet neat project. I think it's important to sensitize people about cryptography and the …

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SANS Christmas Challenge 2012

Posted on lun. 07 janvier 2013 in Write-up


During December, SANS posted a Christmas challenge based on a Christmas story.

This year, Santa is sad because he feels that nobody believes in him anymore, so he decides to cancel Christmas. Mrs. Claus wants to cheer her husband up, in order not to let children down, but her reindeer …

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Stripe CTF: Level #8

Posted on sam. 15 décembre 2012 in Write-up


You can find the code for this level here.

(sha256: d211aa240a0a59eb1f56d3c42a55080d0e27eea2c04bc4410bf608824c847c96)

This is it. The final level to the Stripe CTF. The goal here is to retrieve a 12-digit password, which is too long to brute force. Let's see how we can use the protocol to our advantage.

The infrastructure …

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