Posted by Hector Marco on Dec 04

Hi,

This is a disclosure of a weakness of the ASLR Linux implementation.
The problem appears when the executable is PIE compiled and it has an
address leak belonging to the executable. We named this weakness:
offset2lib.

In this scenario, an attacker is able to de-randomize all mmapped
areas (libraries, mapped files, etc.) by knowing only an address
belonging to the application and the offset2lib value.

We have built a PoC which bypasses on a…