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[Launchpad Bug Tracker <1516831@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package lightdm - 1.16.6-0ubuntu1

---------------
lightdm (1.16.6-0ubuntu1) wily; urgency=medium

  * New upstream release:
    - Handle XDMCP Request packet with no addresses. (LP: #1516831)
    - Don't start LightDM if the XDMCP server is configured with a key that
      doesn't exist. (LP: #1517685)
    - Add IP addresses to XDMCP log messages.
    - Refactor XDMCP error handling.
    - Add more tests.

 -- Robert Ancell <robert.ancell@xxxxxxxxxxxxx>  Fri, 20 Nov 2015
15:46:15 +1300

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

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https://bugs.launchpad.net/bugs/1516831

Title:
  XDMCP Request packet with no addresses crashes LightDM

Status in Light Display Manager:
  Fix Released
Status in Light Display Manager 1.14 series:
  Fix Released
Status in Light Display Manager 1.16 series:
  Fix Released
Status in lightdm package in Ubuntu:
  Fix Released
Status in lightdm source package in Vivid:
  Fix Committed
Status in lightdm source package in Wily:
  Fix Released

Bug description:
  [Impact]
  If LightDM receives an XDMCP Request packet with no addresses then it will attempt to access a negative index into an array and crash. This only occurs if the XDMCP server is enabled.

  [Test Case]
  1. Enable XDMCP in lightdm.conf:
  [XDMCPServer]
  enabled=true
  2. Start LightDM
  3. Send an XDMCP Request without an empty addresses field (valid XDMCP servers do not send this).

  Expected result:
  The request is ignored.

  Observed result:
  LightDM crashes.

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