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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