desktop-packages team mailing list archive

[Martin Pitt <martin.pitt@xxxxxxxxxx>]

Forgot to mention in changelog:

lightdm (0.9.5-0ubuntu2) oneiric; urgency=low

  * debian/lightdm.config: When installing from scratch as part of a release
    upgrade, default to lightdm, otherwise ask. (LP: #806559)
  * Add 04_dont_write_files_as_root.patch: Do not write ~/.dmrc and
    ~/.Xauthority as root. [CVE-2011-3349]
  * Add 00upstream_unlock_fix.patch: Only unlock displays if switched to from
    greeter. Cherrypicked from upstream r1137. (LP: #844274)

 -- Martin Pitt <martin.pitt@xxxxxxxxxx>  Thu, 15 Sep 2011 08:52:24
+0200

Also fixed upstream now in 0.9.6.

** Changed in: lightdm (Ubuntu Oneiric)
       Status: Fix Committed => Fix Released

** Changed in: lightdm
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/834079

Title:
  files written as root to user-controlled folders

Status in Light Display Manager:
  Fix Released
Status in “lightdm” package in Ubuntu:
  Fix Released
Status in “lightdm” source package in Oneiric:
  Fix Released
Status in “lightdm” package in Debian:
  Confirmed

Bug description:
  Hey,

  as you were on CC: I guess you're already aware, but reporting so it
  can be tracked upstream.

  Short version: http://seclists.org/oss-sec/2011/q3/393

  Long version: .dmrc and Xauthority files are written by lightdm
  running as root while they're in user controlled folders. An user can,
  via a symlink, overwrite root-owned files. It doesn't look like it can
  achieve easily privilege-escalation (since the content is quite fixed)
  but it's still bad.

  Basically the correct fix seems to have workers process which would
  setuid() to the user before writing content to those files.

  CVE-2011-3349

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