CVE-2020-15703

There is no input validation on the Locale property in an apt transaction.
An unprivileged user can supply a full path to a writable directory, which
lets aptd read a file as root. Having a symlink in place results in an
error message if the file exists, and no error otherwise. This way an
unprivileged user can check for the existence of any files on the system as
root.

Bugs

• <https://bugs.launchpad.net/ubuntu/+source/aptdaemon/+bug/1888235&gt;