Hacks for beer. FOSS, infosec and privacy. Chaotic good. Head of Security Testing at @visma

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Joined June 2009
ffuf 2.0 is out! There are couple of new major features introduced as well as updates to the project in general. I had way more to say that fits in the birdsite format, so here's a thread on more applicable platform on the topic: infosec.exchange/@joohoi/109…
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Shubs goes brrrrrrrrrrrr
You can now perform content discovery at 100k requests per second with h3fuzz on http/3 hosts (fork of ffuf with http/3 support). Tool here: github.com/assetnote/h3fuzz Research post here: slcyber.io/research/how-prac…
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Joona retweeted
Apparently, RFCs can now be rated from 1 to 5 stars. Because what Internet standards were really missing was a Yelp rating. ⭐⭐⭐☆☆ “OSPF was okay, but the Security Considerations could have been longer.” rfc-editor.org/info/rfc10041…
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Burp AI Agent v1.0.0 released today
Custom AI Agent v1.0.0 ships today: free, MIT-licensed, connects AI agents to Burp, and runs on Community. I pushed the first commit on January 28 and submitted it to the BApp Store on January 30. Nearly seven months later, it still isn't listed. Timeline 🧵:
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Ever wondered how a certain cli flag in ffuf works? I just rewrote the whole ffuf documentation, and one of the ways to browse it is through cli flag reference. Check them out: github.com/ffuf/ffuf/wiki/CL…
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Ylämuistialan kartanon turvakamerassa Tietoturvatyökaluvelho @joohoi. Jakso julkaistaan huomenna! #herrasmieshakkerit #äänijulkaisu #podcast
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Just developed a roll, in the few pics of @ekoparty I found this great snap of @joohoi and myself by @stokfredrik
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At the airport with @TomNomNom
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🔴 Ya están en el LADO B @stokfredrik y @joohoi 😎 Cerrarán hoy el maintrack con su charla: "Flipping Bits: Your Credentials Are Certainly Mine". Sumate al stream junto a @fede_k y @Gala_chip >> twitch.tv/ekoparty
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Getting ready for the second day of @HIPConf by a nice 4k 🏃‍♂️‍➡️ along the Mississippi river. I'll be on stage at 10.40!
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I’ll be around Ekoparty for the next three days. Going to deliver a ffuf talk later today and a bitflip talk together with @stokfredrik on friday. I have a good bunch of ffuf stickers with me, so if you see me around, come and say hi and get yours! Pic: me today
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Boom! Super excited to announce that I’m joining the @joohoi and the badass @visma security team today! 🔥
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Excited to announce @joohoi’s Turbo Talk, "ffuf - Fantastic Features Used by Few" at the #BugBountyVillage during @ekoparty! 🎉 Dive into underutilized features in the web fuzzing tool ffuf, with examples to boost your skills and efficiency in offensive security. 🔥 📅 2024-11-13 ⏰ 17:45 hrs Don’t miss it! 👾✨ #EKO2024 #BugBounty
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I love CRLF Injection 😜
Confirmed! Pumpkin Chang (@u1f383) and Orange Tsai (@orange_8361) from the DEVCORE Research Team combined a CRLF Injection, an Auth Bypass, and a SQL Injection to exploit the Synology BeeStation. They earn $20,000 and 4 Master of Pwn points. #Pwn2Own #P2OIreland
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Hey @ekozonaredteam / @BugBountyArg , are you planning to have lightning talks in your Ekoparty village schedule? As I’ll be around the conference, I could do a lightning talk about newer / less known ffuf features (in case that sounds interesting to you).
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Charlas MainTrack #EKO2024 🔥 📌 @stokfredrik, Hacker - Creative 📌 @joohoi, Head of Security Testing 💡 “Flipping Bits: Your Credentials Are Certainly Mine”: Did you know that if you change a single bit from 1 to 0 (or vice versa) in the first 'g' of the domain name google.com (which is 01100111 in binary) you will end up with variety of valid "bitflip" domains like coogle.com, oogle.com, & woogle.com? So what happens if you generate and register a bunch of cheap bitflipped versions of popular cloud / Saas provider domains, point them to your VPS, log all incoming requests & then forget about the whole thing for two years? Well you will in fact receive a stiff bill, generate huge log files and eventually run out of disk space. But on the upside, you will also have collected a treasure trove of legit credentials & interesting stuff like valid OAuth refresh tokens, JWT tokens, bearers, cookies, emails, meeting invites with passwords & truckloads of internet scanner noise. In this session we will revisit bit-flip research from the last decade and weaponize it. Showcase 'Certainly' a pioneering offensive / defensive tool that employs Wildcard DNS matching & on-the-fly generated SSL certificates and injects custom payloads for incoming requests across various protocols. All with the intention to downgrade security, harvest credentials, capture emails and replacing dependencies. 📍 13, 14 y 15 de noviembre en el CEC - Buenos Aires 🎟️ ¡Registrate gratis hasta el 31/10! >> entradas.ekoparty.org 🚀 Podés ver la agenda completa en ekoparty.org/agenda
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Ahora si, ¡conocé las charlas del MainTrack #EKO2024! 🥳🔥 🎟️ ¿Todavía no tenés tu entrada? ¡Reservá tu lugar! >> entradas.ekoparty.org/
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Excited about the opportunity of getting back to one of my absolute favorite places: Buenos Aires and the mainstage of this years @ekoparty! Grateful and hyped to have @joohoi with me on the adventure! Can’t wait to meet up with yall and hang out with @BugBountyArg
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Remember CVE-2024-4577, the PHP-CGI RCE bypass? Actually, the Best-Fit 'feature' also impacts non-CJK codepages such as locales in the Americas, Western Europe, Oceania, and more! @_splitline_ and I will share these cool findings at @BlackHatEvents! 🔥 Let's make argument injection great again! 😉 blackhat.com/eu-24/briefings…
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A presentation of an amazing adventure into the land of Bitflips, network protocols and cosmic rays by @stokfredrik and yours truly has been accepted to @ekoparty ! Excited to meet the LATAM community, and also a perfect excuse to visit some awesome colleagues in Argentina!
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