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Article #972

Re: movemail bug?

#972
From: Jym Dyer
Date: Tue, 26 Jan 1993 01:50
29 lines
1782 bytes
> I've been unable to persuade my sysadmin to make the movemail
> routine setuid because they believe it will compromise system
> security.  I assume that they are referring to the bug that
> I seem to remember being described in Clifford Stoll's book
> `The Cukoo's Egg'.

=o= That problem's been fixed long ago.  See the file FAQ in
the Emacs etc directory.  I quote:

>  1. the `movemail' incident (No, this is not a risk.)
>
>     Cliff Stoll in his book "The Cuckoo's Egg" describes this in chapter 4.
>     The site at LBL had installed the `etc/movemail' program setuid root.
>     Since `movemail' had not been designed for this situation, a security
>     hole was created and users could get root priveleges.
>
>     `movemail' has since been changed so that even if it is installed
>     setuid root this security hole will not be a result.

=o= It should be noted that Stoll's description of the cause of
the problem is exactly the opposite of reality:  He claimed that
the security hole was a bug in movemail, and contrasted it with
security holes caused by sysadmins installing things wrong.  As
we can see above, the problem actually *was* caused by sysadmins
installing things wrong.

=o= Stoll should write an apology/retraction, and should see to
it that it's distributed widely.
    <_Jym_>
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Message-ID: <Jym.24Jan1993.1758@naughty-peahen>
Path: arc1-ca.pugleaf.net!sparky!uunet!cis.ohio-state.edu!mica.berkeley.edu!jym
References: <1993Jan21.112654.6681@cs.nott.ac.uk>

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Path: arc1-ca.pugleaf.net!sparky!uunet!cis.ohio-state.edu!mica.berkeley.edu!jym
From: jym@mica.berkeley.edu (Jym Dyer)
Newsgroups: gnu.emacs.bug
Subject: Re: movemail bug?
Date: 25 Jan 1993 20:50:00 -0500
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Message-ID: <Jym.24Jan1993.1758@naughty-peahen>
References: <1993Jan21.112654.6681@cs.nott.ac.uk>