desktop-packages team mailing list archive

[Jamie Strandboge <jamie@xxxxxxxxxx>]

*** This bug is a duplicate of bug 834079 ***
    https://bugs.launchpad.net/bugs/834079

** This bug has been marked a duplicate of bug 834079
   files written as root to user-controlled folders

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https://bugs.launchpad.net/bugs/834788

Title:
  Security issues in lightdm

Status in “lightdm” package in Ubuntu:
  New
Status in “lightdm” source package in Oneiric:
  New

Bug description:
  This was reported in http://www.openwall.com/lists/oss-
  security/2011/08/24/7:

  "Date: Wed, 24 Aug 2011 16:08:27 +0200
  From: Sebastian Krahmer <krahmer@xxxxxxx>
  To: oss-security@xxxxxxxxxxxxxxxxxx
  Cc: robert.ancell@xxxxxxxxxxxxx
  Subject: lightdm issues

  Hi,

  lightdm (0.9.2) which aims to be a xdm replacement seems to
  fall into the same pitfalls like kdm and gdm recently. There is
  a lot of uid 0 code creating and chown()ing files in user dirs such as
  for ~/.dmrc and ~/.Xauthority. Probably more, depending on
  how the permissions of cache and log directories are set up. For example
  process_start() also creates and chown()s logfiles on users behalf.

  There is also one thing that I dont understand about the lightdm
  user itself and why pam sessions seem to be started for it inside
  the greeter session code.

  The xdmcp code seems to be OK so far, after a quick review.

  l8er,
  -s"

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