Ubuntu 4.10 / 5.04 : shorewall vulnerability (USN-197-1)
High Nessus Plugin ID 20611
SynopsisThe remote Ubuntu host is missing a security-related patch.
DescriptionA firewall bypass vulnerability has been found in shorewall. If MACLIST_TTL was set to a value greater than 0 or MACLIST_DISPOSITION was set to 'ACCEPT' in /etc/shorewall/shorewall.conf, and a client was positively identified through its MAC address, that client bypassed all other policies/rules in place. This could allow external computers to get access to ports that are intended to be restricted by the firewall policy.
Please note that this does not affect the default configuration, which does not enable MAC based client identification.
Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
SolutionUpdate the affected shorewall package.