Security Incidents mailing list archives
Re: Source port 0 and from a 0 network to boot?
From: junkma1l () cox net
Date: 11 Jun 2005 19:08:31 -0000
The destination website advises they're experiencing 'server problems'. I would have to guess it's a trojan or botnet DDoS/SYN flood attack. As far as the port 0 traffic, a quote from an old Neohapisis archive "Using TCP port 0 is a common tactic to avoid some badly written packet filters.... Some net admins fail to realize that there is a port 0, thinking that the lowest port number is 1, and thus don't account for it when writing firewall rules. An attacker gains the advantage of possibly bypassing firewall rules, or badly written intrusion sensors. It should also be noted that very, very, old versions of DNS were done on port 0, but that wasn't done using TCP." Probably just disguising the attacking host (though not very well) to slow down the filtering/blocking of attackers.
Current thread:
- Source port 0 and from a 0 network to boot? kurt (Jun 10)
- Re: Source port 0 and from a 0 network to boot? Valdis . Kletnieks (Jun 13)
- <Possible follow-ups>
- Re: Source port 0 and from a 0 network to boot? junkma1l (Jun 13)
- Re: Source port 0 and from a 0 network to boot? kurt (Jun 13)