[33371] in bugtraq
Re: Symlink Vulnerability in GNU libtool <1.5.2
daemon@ATHENA.MIT.EDU (Joseph S. Myers)
Wed Feb 4 00:01:43 2004
Date: Tue, 3 Feb 2004 09:47:46 +0000 (UTC)
From: "Joseph S. Myers" <jsm@polyomino.org.uk>
To: bugtraq@securityfocus.com, bug-libtool@gnu.org
In-Reply-To: <4019B011.5010405@informatik.hu-berlin.de>
Message-ID: <Pine.LNX.4.58.0402030928020.7123@digraph.polyomino.org.uk>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
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
