remote command execution in sysconfig

The ifup-dhcp script which is part of the sysconfig package is responsible for setting up network-devices using configuration data obtained from a DHCP server by the dhcpcd DHCP client. It is possible for remote attackers to feed this script with evil data via spoofed DHCP replies for example. This way ifup-dhcp could be tricked into executing arbitrary commands as root. The ifup-dhcp shellscript has been fixed to not source the file containing the possible evil data anymore. Even though the sysconfig package is installed by default, this problem only affects systems with certain dhcp network-setups so only users using DHCP should update their sysconfig package.