Level19 provides us with the following code:

In Level13 we are given the following code:

Level14 provides us with these instructions:

Level11 provides us with the source code for level11.c:

Level12 informs us that “There is a backdoor process listening on port 50001.”

“World readable files strike again. Check what that user was up to, and use it to log into flag08 account.”

Level09 provides us with a C setuid wrapper for some vulnerable PHP code.

level10 provides us with the following source code:

The next level provides us with some perl code:

Level06 specifies that “The flag06 account credentials came from a legacy unix system.”