[USN-3255-1] LightDM vulnerability

Tyler Hicks tyhicks at canonical.com
Tue Apr 4 22:21:26 UTC 2017

Ubuntu Security Notice USN-3255-1
April 04, 2017

lightdm vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 16.10
- Ubuntu 16.04 LTS


LightDM could be made to run programs as an administrator.

Software Description:
- lightdm: Display Manager


It was discovered that LightDM incorrectly handled home directory creation for
guest users. A local attacker could use this issue to gain ownership of
arbitrary directory paths and possibly gain administrative privileges.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 16.10:
  lightdm                         1.19.5-0ubuntu1.1

Ubuntu 16.04 LTS:
  lightdm                         1.18.3-0ubuntu1.1

In general, a standard system update will make all the necessary changes.


Package Information:

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