system-config-firewall is a graphical user interface for basic firewall setup. It was found that system-config-firewall used the Python pickle module in an insecure way when sending data to the privileged back-end mechanism. A local user authorized to configure firewall rules using system-config-firewall could use this flaw to execute arbitrary code with root privileges, by sending a specially-crafted serialized object. Red Hat would like to thank Marco Slaviero of SensePost for reporting this issue. This erratum updates system-config-firewall to use JSON for data exchange, instead of pickle. Therefore, an updated version of system-config-printer that uses this new communication data format is also provided in this erratum. Users of system-config-firewall are advised to upgrade to these updated packages, which contain a backported patch to resolve this issue. Running instances of system-config-firewall must be restarted before the utility will be able to communicate with its updated back-end.