maas regression

USN-2431-1 fixed vulnerabilities in mod_wsgi. The security update exposed
an issue in the MAAS package, causing a regression. This update fixes the
problem.

We apologize for the inconvenience.

Original advisory details:

It was discovered that mod_wsgi incorrectly handled errors when setting up
the working directory and group access rights. A malicious application
could possibly use this issue to cause a local privilege escalation when
using daemon mode.