Hi, have you read:

 * http://www.redhat.com/support/errata/RHSA-2002-028.html

1. Topic:

The Linux Netfilter team has found a problem in the "IRC connection
tracking" component of the firewall within the linux kernel. This problem
affects Red Hat Linux versions 7.1 and 7.2. 

2. Problem description:

The Linux Netfilter team has found a problem in the IRC connection
tracking component of the firewall within the linux kernel. This component
is distributed with kernels in Red Hat Linux 7.1 and 7.2, although it is
not used in default installations.

The problem consists of an excessively broad netmask setting which is
applied to check if an "IRC DCC" connection through a masquerading firewall
should be allowed. This results in unwanted ports being opened on the
firewall, which could, depending on the firewall filter ruleset, allow
inbound connections.

The Common Vulnerabilities and Exposures project (cve.mitre.org) has
assigned the name CAN-2002-0060 to this issue. Thanks to Jozsef Kadlecsik
and Harald Welte of the netfilter team.

Users are advised to upgrade to this errata kernel containing patches
which fix these issues. 

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