Overview# Espressif has already provided a formal response to the recently published claims about ESP32 Bluetooth controller serving as a potential “backdoor” or having “undocumented features” that can cause security concerns. This post highlights the technical details about the relevant … Read more
What happens if you give the Intel 8086 processor an instruction that doesn’t exist? A modern microprocessor (80186 and later) will generate an exception, indicating that an illegal instruction was executed. However, early microprocessors didn’t include the circuitry to detect … Read more
Exploiting aCropalypse: Recovering Truncated PNGs (CVE-2023-21036): The bug lies in closed-source Google-proprietary code so it’s a bit hard to inspect, but after some patch-diffing I concluded that the root cause was due to this horrible bit of API ‘design’: https://issuetracker.google.com/issues/180526528. … Read more
This is a guest post by Raúl Gutiérrez Sanz This multi-part document is about undocumented 8086 processor opcodes and their behavior. Most of the document will likely apply to the 8088 processor as well, but this has not been verified. … Read more
Hello! A couple of days I wrote about tiny personal programs, and I mentioned that it can be fun to use “secret” undocumented APIs where you need to copy your cookies out of the browser to get access to them. … Read more
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