Yesterday a critical security vulnerability has been published by Qualys concerning the GNU Library C (glibc), named GHOST.

That allows?

A major vulnerability on the bash shell has just be discovered.

Since when does it exist?

This flaw has existed since at least version 3 of bash, which makes it is very widespread.

- What is it allows?

The flaw exploits the fact that the Shell bash, at the time or it is started, does not stop the interpretation to where it should when there are definitions of variables or functions of environment and executes orders placed in arguments.