Christoph Martin noticed that upon configuration mason, which interactively creates a Linux packet filtering firewall, does not install the init script to actually load the firewall during system boot. This will leave the machine without a firewall after a reboot.
For the old stable distribution (woody) this problem has been fixed in version 0.13.0.92-2woody1.
For the stable distribution (sarge) this problem has been fixed in version 1.0.0-2.2.
For the unstable distribution (sid) this problem has been fixed in version 1.0.0-3.
We recommend that you upgrade your mason package.
MD5 checksums of the listed files are available in the original advisory.