[33472] in bugtraq
Re: Symlink Vulnerability in GNU libtool <1.5.2
daemon@ATHENA.MIT.EDU (jsm@polyomino.org.uk)
Fri Feb 6 13:25:45 2004
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From: <jsm@polyomino.org.uk>
To: <bugtraq@securityfocus.com>, <bug-libtool@gnu.org>
Date: 3 Feb 2004 21:01:50 -0800
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From: "Joseph S. Myers" <jsm@polyomino.org.uk>
Date: Tue, 3 Feb 2004 21:01:50 -0800
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On Fri, 30 Jan 2004, Stefan Nordhausen wrote:
> Solution:
> Updating to libtool 1.5.2 (the current stable release) will eliminate
> the vulnerability. If you want to stick with your old version of libtool
> you can easily fix this bug yourself. In "ltmain.in" (or file "libtool",
> whichever applies for you) you should replace the line:
>
> if $mkdir -p "$tmpdir" && chmod 700 "$tmpdir"; then :
>
> with
>
> if $mkdir "$tmpdir" && chmod 700 "$tmpdir"; then :
The chmod has a race (that access to the temporary directory could be
gained after it is created but before it is chmoded) - which I pointed out
when I reported this security bug four years ago
<http://www.geocrawler.com/mail/msg.php3?msg_id=3438808&list=405> - so is
of limited security value. Alexandre Oliva's patch at that time
(<orsnxk8oqu.fsf@garnize.lsd.ic.unicamp.br> on libtool-patches) used umask
to avoid that problem, but wasn't committed (an entirely separate patch
was committed under that log message).
--
Joseph S. Myers
jsm@polyomino.org.uk
