The About section for Level15 contains the following instructions:

For Level16, we are told that a perl script is running on port 1616.

Level17 dictates, “There is a python script listening on port 10007 that contains a vulnerability.”

Level18 provides us with this large snippet of code:

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.”