Recourse ManTrap 1.6 allows attackers to cause a denial of service via a sequence of commands that navigate into and out of the /proc/self directory and executing various commands such as ls or pwd.
https://exchange.xforce.ibmcloud.com/vulnerabilities/5528
http://www.securityfocus.com/bid/1913
http://marc.info/?l=bugtraq&m=97349791405580&w=2
http://archives.neohapsis.com/archives/bugtraq/2000-11/0100.html
http://archives.neohapsis.com/archives/bugtraq/2000-11/0041.html