It has been a while since I did some hardware hacking and this time I want to review the basics. The LinkSys EA6100 router intrigued me due to the fact that I was only able to find encrypted firmware images (or updates). Known tools like binwalk were unable to unpack…
Welcome back to part 2.2 of this series! If you have not yet checked out part 1 or part 2.1 please do so first as they highlight important reconnaissance steps as well as the first half of the disassembly analysis! Let's recall the current functionality we've encountered based…
Welcome back to part 2 of this series! If you have not checked out part 1 yet please do so first as it highlights important reconnaissance steps! So let us dive right into the IDA adventure to get a better look at how imgdecrypt operates to secure firmware integrity of…
Recently we came across some firmware samples from D-Link routers that we were unable to unpack properly. Luckily we got our hands on an older, cheaper but similar device (DIR882) that we were able to analyze more closely. The goal is to find a way to mitigate the firmware encryption…
PrefaceNote: As always the following is just a digest of all the things I could observe by working on printers myself or facts from stuff I read about recently. Since this thread about the HP printer promo videos caught some attention I will try to shed some light onto the…