[kingforaday]

You typically don't see ASLR enabled on these armhf embedded devices. I see the statement by the author, " quickly confirmed on the device that address space layout randomization (ASLR) was enabled...", but how was it quickly checked? What was the output of /proc/sys/kernel/randomize_va_space?

Also not familiar at all with the checksec program, but from my look at the documentation, you expect to see PIE enabled not DSO (which implies dynamic shared object).

[alchemio]

checksec is part of the pwntools suite. Along with other tools for finding ROP gadgets and shellcode generation.