[USN-3285-1] LightDM vulnerability
tyhicks at canonical.com
Fri May 12 00:14:07 UTC 2017
Ubuntu Security Notice USN-3285-1
May 12, 2017
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 17.04
- Ubuntu 16.10
LightDM could allow unintended access to files.
- lightdm: Display Manager
Tyler Hicks discovered that LightDM did not confine the user session for guest
users. An attacker with physical access could use this issue to access files
and other resources that they should not be able to access. In the default
installation, this includes files in the home directories of other users on the
system. This update fixes the issue by disabling the guest session. It may be
re-enabled in a future update. Please see the bug referenced below for
instructions on how to manually re-enable the guest session.
The problem can be corrected by updating your system to the following
After a standard system update you need to reboot your computer to make
all the necessary changes.
-------------- next part --------------
A non-text attachment was scrubbed...
Size: 819 bytes
Desc: not available
More information about the ubuntu-security-announce