Ethical Hacking

Learn to find vulnerabilities before the bad guys do! Gain real world hands on hacking experience in our state of the art hacking lab. Course designed and taught by expert instructors with years of penetration testing experience. 12 student maximum in every class. Certification attempt included in every package.
Computer Forensics Training at InfoSec Institute

Gain the in-demand skills of a certified computer examiner, learn to recover trace data left behind by fraud, theft, and cybercrime perpetrators. Discover the source of computer crime and abuse at your organization so that it never happens again. All of our class sizes are guaranteed to be 12 students or less to facilitate one-on-one interaction with one of our expert instructors.




Network Security Incidents
[Top] [All Lists]

Re: Source port 0 and from a 0 network to boot?

Subject: Re: Source port 0 and from a 0 network to boot?
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.

<Prev in Thread] Current Thread [Next in Thread>