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Date: Fri, 16 Sep 2016 13:38:38 -0400
From: Jan Schaumann <jschauma@...meister.org>
To: oss-security@...ts.openwall.com
Cc: chet.ramey@...e.edu
Subject: Re: CVE-2016-0634 -- bash prompt expanding $HOSTNAME

John Haxby <john.haxby@...cle.com> wrote:
 
> A little while ago, one of our users discovered that by setting the
> hostname to $(something unpleasant), bash would run "something
> unpleasant" when it expanded \h in the prompt string.

To clarify: this is only triggered if the hostname has been set, not the
$HOSTNAME variable, right?

Your subject line suggests setting $HOSTNAME would lead to command
execution, which would be a vulnerability reminiscent of shellshock, but
quickly glancing at the code, it looks like $HOSTNAME is only used if
gethostname(3) returned an empty string?

-Jan

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