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Date: Wed, 09 Nov 2011 10:47:17 -0500
From: Marc Deslauriers <marc.deslauriers@...onical.com>
To: kseifried@...hat.com
Cc: oss-security@...ts.openwall.com, Yves-Alexis Perez <corsac@...ian.org>
Subject: Re: Re: [LightDM] Version 1.0.6 released
On Wed, 2011-11-02 at 10:40 -0600, Kurt Seifried wrote:
> On 11/02/2011 10:31 AM, Yves-Alexis Perez wrote:
> > On mer., 2011-11-02 at 10:16 -0600, Kurt Seifried wrote:
> >> On 11/02/2011 09:54 AM, Yves-Alexis Perez wrote:
> >>> On mer., 2011-11-02 at 11:42 -0400, Robert Ancell wrote:
> >>>> Fixes a security issue where using ~/.Xauthority as a symlink would
> >>>> cause LightDM to set the destination of the link to user ownership.
> >>>> All users of 1.0.4 or 1.0.5 should upgrade immediately.
> >>>>
> >>>> Overview of changes in lightdm 1.0.6
> >>>>
> >>>> * Use lchown for correcting ownership of ~/.Xauthority instead of chown
> >>> Could a CVE be assigned for this?
> >>>
> >>> Regards,
> >> Can you send me the link to this announcement so I can confirm it? Thanks.
> >>
> > Here's the link to the mailing list mail:
> > http://lists.freedesktop.org/archives/lightdm/2011-November/000178.html
> >
> > Regards,
> Thanks, confirmed (first hand info is much better). Please use
> CVE-2011-4105 for this issue.
>
BTW, the fix that is in 1.0.6 is probably not enough for distros that
don't implement hard link restrictions, such as the Yama LSM that is
used in Ubuntu.
Marc.
--
Marc Deslauriers
Ubuntu Security Engineer | http://www.ubuntu.com/
Canonical Ltd. | http://www.canonical.com/
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