johannes @wiknerj
retweets are my not own 😺 occasionally dyhszlkehktikc jknr.me Joined September 2014-
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🚨 Breaking: AI agents aren’t “productivity tools.” Individuals pushing massive amounts of code. This isn’t just automation. It’s leverage.
Absolutely insane week for agentic engineering 37K LOC per day across 5 projects Still speeding up
Working on the new simulator. I just wanted to see what Atari2600 fetching data from ROM looks like at CMOS FET level (@tinytapeout TT09 Atari circuit by @__ReJ__)
Me: Power corrupts @wiknerj: Rowhammer is a good example of that
@__sethJenkins we made use of this repro retbleed on arm64 back some 3-4 years ago. Didn't care too much since KASLR is not really a problem for local attackers. We were hoping this was upstream arm64 local: "Android can't be _that_ bad." whops
Our latest post details how we exploited Retbleed (a CPU vulnerability) to compromise a machine from a sandboxed process and VM! Curious? 👇 bughunters.google.com/blog/624373010…
Great selection - in particular nr 6 😎 Excited for #blackhat2025. Hope to see many new and familiar faces in Vegas in the upcoming days :)
Blackhat USA 2025 will happen soon, this is my personal top 12 master selection: 1. HTTP/1.1 Must Die! The Desync Endgame Speaker: James Kettle Tracks: Application Security: Offense, Application Security: Defense Format: 40-Minute Briefings Location: Oceanside A, Level 2 2.
Huh, I didn't realize that the vibe-coded vulns inserted into 5 LTS kernels that still aren't fixed 22 days later haven't been fixed because the person who inserted them is busy telling everyone at a conference how great the AI he used to insert the vulns (that he didn't find) is
@UnderCoercion way to make 4% difference look like 90%
Happy to announce that the paper about IBPB problems that included the first real cross-process Spectre exploit just got a distinguished paper award at @IEEESSP! Dr. @wiknerj now has two of these awards in his thesis. What will he do next?!
HW defenses against Spectre are tricky: they need to be applied correctly by the SW, and we need to trust that the HW does what its supposed to. Our latest work "Breaking the Barrier" exploits loopholes in both of these issues on Intel and AMD parts. comsec.ethz.ch/breaking-the-b…
Branch Race Conditions Predictor causes recent predictions to be added after more recent privilege switches (→ wrong privilege, eIBRS💥) prediction flushes (→ retained valid, IBPB💥) finish. @sparchatus eventually figured it out 🙌
Disclosing Branch Predictor Race Conditions (BPRC), a new class of vulnerabilities where asynchronous branch predictor operations violate hardware-enforced privilege and context separation in virtually all recent Intel CPUs. @wiknerj @kavehrazavi : comsec.ethz.ch/bprc
Spectre v2 is back again! Disclosing "Training Solo": 3 new self-training attack classes, 2 end-to-end exploits, and 2 new hardware issues that break domain isolation even when implemented perfectly. Joint work by @SanWieb @c_giuffrida: vusec.net/projects/train…
🔨 Posthammer (USENIX Sec '25) brings Rowhammer back in the browser! What if visiting a website was enough to trigger a Rowhammer attack? Posthammer shows how to bring non-uniform Rowhammer patterns into the browser. More information: 📄comsec.ethz.ch/posthammer
The @phrack 72 CFP horny emojipasta has hit the chats
We updated our CFP for Phrack 72! The deadline is now April 1st 2025. Check the site for specifics on how to contribute, as well as some inspiration! We also posted a link to purchase physical copies of Phrack 71, and a donation link too. Enjoy! phrack.org
Thanks for the 21st @h2hconference! Always a joy to meet the mix of researchers, enthusiasts, academics, hackers. Special thanks to the organizers and yes the 🚌 trip to Rio went smoothly @bsdaemon @gabrielnb 😄 has a moment to enjoy this very special zine on the journey..
@bsdaemon Thanks for everything you've done for H2HC!
The first ever end-to-end cross-process Spectre exploit? I worked on this during an internship with @grsecurity! An in-depth write-up here: grsecurity.net/cross_process_…
And of course we fix the problems we cause (unless they're in microcode..). github.com/torvalds/linux…
HW defenses against Spectre are tricky: they need to be applied correctly by the SW, and we need to trust that the HW does what its supposed to. Our latest work "Breaking the Barrier" exploits loopholes in both of these issues on Intel and AMD parts. comsec.ethz.ch/breaking-the-b…
My and @kavehrazavi's paper has been accepted for S&P 2025.
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