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=========================================================== Ubuntu Security Notice USN-197-1 October 10, 2005 shorewall vulnerability CAN-2005-2317 =========================================================== A security issue affects the following Ubuntu releases: Ubuntu 4.10 (Warty Warthog) Ubuntu 5.04 (Hoary Hedgehog) The following packages are affected: shorewall The problem can be corrected by upgrading the affected package to version 2.0.2-4ubuntu2.1 (for Ubuntu 4.10), or 2.0.13-1ubuntu0.1 (for Ubuntu 5.04). In general, a standard system upgrade is sufficient to effect the necessary changes. Details follow: A 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.