cor_ctf's profile picture. A European and American Security Research Group

Crusaders of Rust

@cor_ctf

A European and American Security Research Group

We at CoR (+ @u1f383) had a great experience at @hexacon_fr this weekend Met many skilled VR people, the venue was amazing, and the speaker gifts were simply🔥 Best offensive security conference we have seen so far - thanks again to the organizers for the opportunity!

cor_ctf's tweet image. We at CoR (+ @u1f383) had a great experience at @hexacon_fr this weekend

Met many skilled VR people, the venue was amazing, and the speaker gifts were simply🔥

Best offensive security conference we have seen so far - thanks again to the organizers for the opportunity!

Crusaders of Rust reposted

An RbTree Family Drama: Exploiting a Linux Kernel 0-day Through Red-Black Tree Transformations by William Liu and Savino Dicanosa

hexacon_fr's tweet image. An RbTree Family Drama: Exploiting a Linux Kernel 0-day Through Red-Black Tree Transformations by William Liu and Savino Dicanosa

Wanna learn how to perform OOP in functional programming all in Google Sheets? Come check out our team member @MaxCai33447144 research, which he made into a corCTF 2025 challenge! cor.team/posts/corctf-2…


We have a🔥presentation ready for Hexacon. Come grab a beer with us afterwards! See everyone in Paris🇫🇷🫡

📢 An RbTree Family Drama: Exploiting a Linux Kernel 0-day Through Red-Black Tree Transformations by William Liu & Savino Dicanosa

hexacon_fr's tweet image. 📢 An RbTree Family Drama: Exploiting a Linux Kernel 0-day Through Red-Black Tree Transformations by William Liu & Savino Dicanosa


Say hello to Eternal Tux🐧, a 0-click RCE exploit against the Linux kernel from KSMBD N-Days (CVE-2023-52440 & CVE-2023-4130) willsroot.io/2025/09/ksmbd-… Cheers to @u1f383 for finding these CVEs + the OffensiveCon talk from gteissier & @laomaiweng for inspiration!


Check out our teammate's retrospective on his kernel fuzzing summer: willsroot.io/2025/09/syz-su… It covers a net/sched fuzzing quirk (inspiring HangBuzz101 in corCTF), and summarizes the kernelCTF adventures of our team. Another really cool exploit write-up will drop this Sunday 👀


For corCTF2025 our teammate D3vil (syst3mfailure.io) wrote an Android kernel pwn. Congrats to @u1f383 for the only solve! Make sure to read his writeup!

Last weekend, I participated in corCTF and solved the Android Pwn challenge - corphone. It was a great challenge, and I learned a lot from it. Here's my write-up :) u1f383.github.io/android/2025/0…



We recently claimed the cos-113 slot with an exploit for CVE-2024-58240😎 A backport for an exploitable UAF was missed for 6.1.x for the past 1.5 years🧐 Maybe when we have healed from our recent 100k bug bounty typo will we tell the full story🤪

cor_ctf's tweet image. We recently claimed the cos-113 slot with an exploit for CVE-2024-58240😎

A backport for an exploitable UAF was missed for 6.1.x for the past 1.5 years🧐

Maybe when we have healed from our recent 100k bug bounty typo will we tell the full story🤪

Per tradition, corCTF rev is just VM rev. Check out these 2 author writeups about VM rev from @MaxCai33447144, our new reverse engineer lead! cor.team/posts/corctf-2… cor.team/posts/corctf-2…


Come check out our author writeup for corctf-challenge-dev-2 from Drakon: cor.team/posts/corctf-2… Timing side-channel attack against Chromium extensions😎


corCTF 2025 has ended! Congrats to the top 5: 1. @FlatNetworkOrg 2. @r3kapig @ProjectSEKAIctf 3. The Amazing Digital Orange 4. @TheRomanXpl0it 5. STM Thank you to all of our players and sponsors! @osec_io, Research Innovations, @ret2systems, @trailofbits, @vector35, @googlecloud

cor_ctf's tweet image. corCTF 2025 has ended! Congrats to the top 5:
1. @FlatNetworkOrg
2. @r3kapig @ProjectSEKAIctf
3. The Amazing Digital Orange
4. @TheRomanXpl0it
5. STM
Thank you to all of our players and sponsors! @osec_io, Research Innovations, @ret2systems, @trailofbits, @vector35, @googlecloud

24 hours left in corCTF! Come play if you haven't already, and let's see if there are any big moves in the final day 👀 Our final challenge wave will be dropping shortly.

cor_ctf's tweet image. 24 hours left in corCTF! Come play if you haven't already, and let's see if there are any big moves in the final day 👀

Our final challenge wave will be dropping shortly.

Online Safety Act getting in your way? Win £50 or a year of NordVPN in misc/england. Come play corCTF 2025, only 42 more hours to go!

cor_ctf's tweet image. Online Safety Act getting in your way? Win £50 or a year of NordVPN in misc/england. Come play corCTF 2025, only 42 more hours to go!

corCTF 2025 begins in an hour! Come register at 2025.cor.team 😎 We have everything from easy challenges to an AMD uarch attack, a web service 0-day, and an Android LPE exploit👀


On your marks, set, pwn in 24 hours!🚩 Come register for corCTF 2025 at 2025.cor.team 😎, our prize pool is over 10k USD🤑

cor_ctf's tweet image. On your marks, set, pwn in 24 hours!🚩

Come register for corCTF 2025 at 2025.cor.team 😎, our prize pool is over 10k USD🤑

Last year our Windows challenge went unreleased due to infra issues (surprise surprise, M$ products are a pain to deal with)... but this year, it's redemption! If you want to try out 2 Windows pwns, mark your calendars for corCTF and register at 2025.cor.team😎

cor_ctf's tweet image. Last year our Windows challenge went unreleased due to infra issues (surprise surprise, M$ products are a pain to deal with)... but this year, it's redemption!

If you want to try out 2 Windows pwns, mark your calendars for corCTF and register at 2025.cor.team😎

Registration for corCTF 2025 is up🚩 2025.cor.team Mark your calendars for August 30th to September 1st!


Get ready to reverse-engineer our pure object-oriented programming language, compiling into a pure google sheets functional paradigm! Get ready for corCTF 2025🔥

cor_ctf's tweet image. Get ready to reverse-engineer our pure object-oriented programming language, compiling into a pure google sheets functional paradigm!

Get ready for corCTF 2025🔥
cor_ctf's tweet image. Get ready to reverse-engineer our pure object-oriented programming language, compiling into a pure google sheets functional paradigm!

Get ready for corCTF 2025🔥

💰corCTF 2025 PRIZES💰 1st: - $3000 2nd: - $2000 3rd: - $1337 4th: - $800 5th: - $500 Top 5 teams: Binja Personal License Top 10 teams: RET2 Wargame Token Up to $1000 prize pool for bloods and writeups. Get ready to pwn at 8/30 UTC midnight👀


Crusaders of Rust reposted

We came 3rd at this year's DEFCON CTF Finals as @SuperDiceCode! Thanks to @SuperGuesser , CodeRed, and @SquidProxyLover for playing with us, and @Nautilus_CTF for organising.

dicegangctf's tweet image. We came 3rd at this year's DEFCON CTF Finals as @SuperDiceCode!

Thanks to @SuperGuesser , CodeRed, and @SquidProxyLover for playing with us, and @Nautilus_CTF for organising.
dicegangctf's tweet image. We came 3rd at this year's DEFCON CTF Finals as @SuperDiceCode!

Thanks to @SuperGuesser , CodeRed, and @SquidProxyLover for playing with us, and @Nautilus_CTF for organising.

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