2022-11-24: Weird PCI-e connector actually works

This is actually a follow-up to the last paragraph from my previous Debug Log. To save you some reading, I was trying to find which device causes boot delays on my PC. Eventually I traced it to a Bluetooth module, which – to my surprise – was a part of a detachable WiFi+BT module connected to a custom 20-pin header on the motherboard (electrically that was an M.2 key E, i.e. PCI-e x1 + USB). The afore mentioned last paragraph goes like this:

The only question that remains is whether one can attach a GPU through an adapter to this slot (will be pretty slow, especially that it's PCI Express x1 version 2.0 – since it's attached to the chipset and X99 does only PCIe 2.0). Not that there is any reason to do it. Anyway, I might or might not have ordered a proper cursed adapter from a certain Chinese electronics site, so guess we'll find out.

Well, the adapter arrived yesterday, so I took it for a spin. The rest of this blogpost consists mostly of photos.

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2022-10-16: Rozwiązania MSHP CTF (październik 2022)

Odbywający się 17 października 2022 Sekurak Mega Hacking Party w zasadzie rozpoczął się dwa dni wcześniej od indywidualnego CTFa. W którego miałem nie grać. Bo miałem robić inne Ważniejsze Rzeczy™. Ale wyszło jak zwykle - i w sumie fajnie, bo CTF okazał się być bardzo sympatyczny.

Poniżej znajdują się rozwiązania zadań, w których udało mi się zdobyć flagę. Rozwiązania są dość skrótowe, ale starałem się mniej więcej wskazać jaką drogą poszedłem.

Rozwiązania innych osób:

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EN Security papers and research notes

Some conference slides are linked at the bottom of this page.

EN Selected vulnerabilities

The full list of vulnerabilities discovered by me (including collaborative work) can be found here (please note that the list might be out of date).

The Google Application Security / Research site might also contain some of my findings.

EN Coding (selected posts)
EN Tools and libraries
  • PiXieServ is a simplified PXE (network boot) server for Windows and Linux-based OS, created for testing of very small home-made OS. See also the post about it.
  • ExcpHook, a system-wide exception monitor for Windows XP 32-bit. Useful if you're fuzzing something that doesn't like having a debugger attached.
  • Ent is an entropy measuring tool for reverse engineering reconnaissance (see also a post explaining how to use it).
  • HiperDrop is a simple command line process memory dumper for Windows, with a few different work modes.
  • asmloader - this little app executes headerless machine code (compiled assembly code). It's meant to be an aid in learning/teaching and playing with assembly, as well as the right tool when you just need to execute some machine code.
  • NetSock is a simple socket/networking lib/wrapper for C++ I've wrote back in 2003 and update from time to time - I use it for most of my network-enabled projects.
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  • Hacking - jak uczyć się security/hackingu i spać spokojnie.

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