/bin/login segfaults when control-D is pressed at login: prompt.
Here is the script output.
Script started on Mon Jan 15 17:53:45 2001
login: <press control-D here>
Script done on Mon Jan 15 17:53:52 2001
So far as I can tell, no security issues as such, but there might be
suid root programs that call /bin/login.
RedHat version: 6.2
PAM version: pam-0.72-6
util-linux version: util-linux-2.10f-7
Bug verified on both 6.2 and 7. Should be fixed as of util-linux-2.10p-3 in Raw