oss-security - Re: CVE request -- zsh, XFree86-xfs/xorg-x11-xfs, screen

Openwall GNU/*/Linux - a small security-enhanced Linux distro for servers

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Date: Thu, 2 Apr 2009 16:54:01 +0200
From: Tomas Hoger <thoger@...hat.com>
To: oss-security@...ts.openwall.com
Cc: coley@...us.mitre.org
Subject: Re: CVE request -- zsh, XFree86-xfs/xorg-x11-xfs,
 screen

On Tue, 31 Mar 2009 21:12:25 -0400 (EDT) "Steven M. Christey"
<coley@...us.mitre.org> wrote:

> > 3, screen: Unsafe usage of temporary file
> >    References:
> >    https://bugs.launchpad.net/ubuntu/+source/screen/+bug/315993
> >    http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=521123
> >    https://bugzilla.redhat.com/show_bug.cgi?id=492104

Based on the additional comments in the upstream bug:
  https://savannah.gnu.org/bugs/index.php?25296

> CVE-2009-1214 - world-readable permissions

This should be expected and intended behavior.

> CVE-2009-1215 - symlink following

There should be no real symlink issue for /tmp/screen-exchange in the
upstream version.  Debian screen version seems to have a patch, that
introduces a symlink flaw, but it does not depend on any race
condition.  Description for this one may need to be updated.

-- 
Tomas Hoger / Red Hat Security Response Team

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