F5 BIG-IP TMUI Directory Traversal and File Upload RCE

This module exploits a directory traversal in F5's BIG-IP Traffic
Management User Interface (TMUI) to upload a shell script and execute
it as the Unix root user.

Unix shell access is obtained by escaping the restricted Traffic
Management Shell (TMSH). The escape may not be reliable, and you may
have to run the exploit multiple times. Sorry!

Versions 11.6.1-11.6.5, 12.1.0-12.1.5, 13.1.0-13.1.3, 14.1.0-14.1.2,
15.0.0, and 15.1.0 are known to be vulnerable. Fixes were introduced
in 11.6.5.2, 12.1.5.2, 13.1.3.4, 14.1.2.6, and 15.1.0.4.

Tested against the VMware OVA release of 14.1.2.