Re: Re: [LightDM] Version 1.0.6 released

[Marc Deslauriers <marc.deslauriers () canonical com>]

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/