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Re: vlock vulnerability in RedHat 7.0
From: Trond Eivind Glomsrød <teg () REDHAT COM>
Date: Tue, 7 Nov 2000 15:04:30 -0500

Bartlomiej Grzybicki <bgrzybicki () morliny pl> writes:

I've tried to lock all virtual consoles
in RedHat 7.0 using vlock, which
is delivered with this release of RedHat.

If user root locks all consoles - it's no problem,
but if normal user locks consoles then
anybody can unlock without typing a password.

Try to use it in the following way:

1. logon as an ordinary user on tty1
2. logon as root on tty2
3. Type on tty1 vlock -a
4. All consoles will be locked.
5. When vlock asks for password
press ENTER and don't release the key
until you see message 'broken pipe'.
6. If you see it all two consoles are unlocked.

How is your system configured? I can't reproduce this.

Trond Eivind Glomsrød
Red Hat, Inc.

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