who (fwd)

[Jan-Philip Velders <jpv jvelders tn tudelft nl>]

Hi *,

fwd from bugtraq 

Greetings,
Jan-Philip Velders
<gvelders jvelders tn tudelft nl>
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---------- Forwarded message ----------
Date: Tue, 28 Jul 1998 20:27:21 +0200
From: Paul Boehm <paul BOEHM ORG>
To: BUGTRAQ NETSPACE ORG
Subject: who

Hi,
the 'who' program is on some systems in a privileged group
which is allowed to read utmp. On redhat linux 5.1 you can
easily crash who by many different ways (e.g. try who /bin/bash)
on freebsd you can use it to view parts of the content of files that
privileged group may read(try who /privileged/group/file).

this is no big deal with security, but gaining a more privileged group
sometimes may be the key to root compromise.

bye,
    pb

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