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stacksmashing Profile picture
@ghidraninja
Aug 16, 2021 • 7 tweets • 2 min read • Read on X
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Bought one of those small 7” field monitors for filming…

Turns out it drains its battery with 72mA - while turned off 😐
I’m sure my NP-F550 batteries really like to get discharged to absolute zero 🥲
Is that a debug header? 👀 Backside of a device, showing a tiny connector
Wow, didn’t expect to find a Spartan 6 in there 😶
No clue what that guy is though
Just the right carpet to search a tiny black screw on🥲
Back together (well, minus one screw) - might dump the two flashchips (Zbit 25VQ32BSIG) tomorrow just out of curiosity

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More from @ghidraninja

stacksmashing Profile picture
Aug 8, 2024
Let's talk about some of the security features of the new @Raspberry_Pi RP2350, because they are 🔥🧵
1.) Glitch Detectors

The RP2350 has 4 embedded glitch detectors, with configurable sensitivity. These will respond to voltage & EM fault-injection attempts, and reset the chip.

In our testing we found that they are quite effective at capturing most glitches. Image
2.) The RCP - Redundancy Coprocessor

The RCP protects the bootrom against fault-injection (and other) attacks by generating randomized stack canaries (in hardware!), providing boolean value validation based on bit-patterns, etc. Image
Read 9 tweets
stacksmashing Profile picture
Mar 5, 2024
One of my neighbours seems to have a smart toilet - and it looks like I can connect to it 👀 Image
According to the website I can remote control the bidet functionality 😂 Image
Can someone figure out the part number of the control board? Can't seem to find it as a replacement part :D
Read 6 tweets
stacksmashing Profile picture
Oct 12, 2023
So I was trying to sniff the BitLocker TPM key on an old laptop of mine - it has this great debug port that exposes most of the TPM (Low Pin Count Bus) signals, but it’s missing the clock signal. Image
So I could either hunt for the clock signal on the backside - or build a "clockless" LPC analyzer! And after a bit of coding I built a @saleae LA analyzer that doesn't need a clock signal - and was able to decode the whole TPM communication! Image
Then I wrote a couple of simple scripts to extract the VMK (Volume Master Key) from my recorded traffic! Image
Read 9 tweets
stacksmashing Profile picture
Sep 23, 2023
Let’s gooo Image
Off to a good start - let the jankiness begin Image
First good news, the amazing Asahi macvdmtool works with the iPhone 15! So you can reboot etc the phone via USB-C :)

(Ignore the error)
Image
Image
Read 16 tweets
stacksmashing Profile picture
Jul 13, 2023
Ever wondered what makes a secure element secure?

A part of it is this pattern: Image
This is a (not-so-great😅) die shot of the upper side of an ATECC608A secure element. As you can see, the upper layer looks like it's all metal - but if we zoom in, we get the above pattern Image
This pattern is there to prevent invasive attacks such as microprobing, and also makes it necessary to delayer the chip to start even seeing any of the actual logic (though you can just look at it from the backside using IR).

(Picture by TU München: ) https://t.co/TtL7UNgsqece.cit.tum.de/en/eisec/resea…
Image
Read 5 tweets
stacksmashing Profile picture
Aug 4, 2021
20 arcade buttons and a Raspberry Pi Pico make for a fun evening project 😀
Total project costs:
- $30 for arcade buttons
- $4 Pico
- $10 Blade receptacles
- Wire + random wooden board I had laying around

Time: Roughly two hours for the build (damn cable crimping). Takes longer if your chordless drill dies in the middle 🥲
In German we call it “Kabelsalat” Image
Read 6 tweets

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