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Date:      Tue, 21 Aug 2001 11:35:55 +0800
From:      Eugene Grosbein <eugen@svzserv.kemerovo.su>
To:        stable@freebsd.org
Subject:   stale entries in utmp (security issue?)
Message-ID:  <3B81D71B.B099197F@svzserv.kemerovo.su>

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Hi!

1. login as root
2. type 'login -f username' when username is valid name of user that is
not logged now
3. type 'logout'
4. Now you are root but command 'w' does not say so (security?)
5. type 'logout'
6. Now command 'w' says user 'username' is still logged but it has no
processes.

This seems like a bug. This is a simple method to reproduce but
there are other ways to get such 'zombie' users. You may have to reboot
system to handle this.

Eugene Grosbein

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