Seems there's quite a bug in the Linux distrub. of Half-Life Dedicated Server. Here's how to fix it:
Check out the link for more info.A) Consider not running the HalfLife software at all!
B) Remove the world execute bit from inetd to 'break' the exploit
code - this
would only stop the script kiddies
C) Ensure sane ipfwadm/ipchains filters are inplace