My_Friend_A_Loathsome_Worm

In November of 1988 the internet changed forever when the very first self-propagating worm, the Morris Worm, began spreading like wildfire. This clever little program took advantage of week passwords, as well as a buffer overflow vulnerability in the BSD fingerd service to spread. Here's the actual vulnerable source code that the Morris Worm was able to exploit! Do you see the bug?

http://www.retro11.de/ouxr/43bsd/usr/src/etc/fingerd.c.html