Bypassing ASLR/NX with GOT Overwrite - finding system offset

[AndyCyberSec]

Please clarify how tou find system offset

This is not clear:
./dump local-03ffe08ba6d5e7f5b1d647f6a14e6837938e3bed | grep system

what is it?

Then the guide will be perfect :)

[sanmiguella]

you can use objdump too but..

objdump -d /lib/i386-linux-gnu/libc-2.23.so | grep "<__libc_system@@GLIBC_PRIVATE>" -> command
0003ada0 <__libc_system@@GLIBC_PRIVATE> -> 0x0003ada0

identify and dump is to make your life easier

vagrant@ubuntu-xenial:~/libc-database$ ./identify /lib/i386-linux-gnu/libc-2.23.so
id local-568c528bd0d4ab9279ab140a11c9b138487e41ee

vagrant@ubuntu-xenial:~/libc-database$ ./dump local-568c528bd0d4ab9279ab140a11c9b138487e41ee | grep system
offset_system = 0x0003ada0