ARPtool has basically two functions: 1) it maps all the ip's on the same ethernet cable segment/LAN as the machine it runs on, which is useful to determine the hosts that could be victim of sniffing, hijacking, etc. 2) a general ARP generator function, for sending customized ARP packets, which can be used for spoofing hosts, DoS, etc.
80922942c238437cc8f4b15ffaf546bf7e6e417f66f73374829a03c4d25b767dSecurity flaw in Linux 2.4 IPTables using FTP PORT - If an attacker can establish an FTP connection passing through a Linux 2.4.x IPTables firewall with the state options allowing "related" connections (almost 100% do), he can insert entries into the firewall's RELATED ruleset table allowing the FTP Server to connect to any host and port protected by the firewalls rules, including the firewall itself. Advisory available here.
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