The authconfig packages contain a command-line utility and a GUI application that can configure a workstation to be a client for certain network user information, authentication schemes, and other user information and authentication-related options. Security Fix: * A flaw was found where authconfig could configure sssd in a way that treats existing and non-existing logins differently, leaking information on existence of a user. An attacker with physical or network access to the machine could enumerate users via a timing attack. This issue was discovered by Tomas Mraz and Thorsten Scherf . Additional Changes: For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.4 Release Notes linked from the References section.