This bug was fixed in the package lightdm - 1.14.4-0ubuntu1
---------------
lightdm (1.14.4-0ubuntu1) vivid; 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.anc...@canonical.com> Fri, 20 Nov 2015
16:01:15 +1300
** Changed in: lightdm (Ubuntu Vivid)
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 Released
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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