I saw a cool video by ghidra ninja on yt that went over firmware reversing
for an a small security camera. He got the firmware from the site of the
manufacturer and went over binwalk and showed how there’s a linux
filesystem on it in squashfs form. This was really amusing — the
fact that there is a whole file system in a single binary. He then goes on
to to see a rc script that runs on the device (this is after separating the
filesystem and unsquashing it) and edits that code to include a reverse
shell using nc. Some version of nc do not have the -e flag though and there’s a
workaround for that in the man page of nc itself. I find that kind of
ironic.