RE: nmap shows open UDP port 113

["Gary Rollie" <garyr () pria net>]

Try Setting up a sniffers on your network and issue a ping or trace
route command from the target system to your agent host.  Also another
suggestion is to send a ftp transfer or some other outgoing connection
that you can see/watch from a sniffers or remote site.  I would also try
and extend the time nmap waits for a response from the target host ..

Some assumptions I am making;

ICMP isn't dropped at the router or any routers in the path you are
taking otherwise you'll get nothing.
You are actually connected to the host and not just a syn ack ..

Just some thoughts

NiteRaven


-----Original Message-----
From: BillyBobKnob [mailto:billybobknob () hotmail com] 
Sent: Wednesday, March 24, 2004 9:58 PM
To: pen-test () lists securityfocus com
Subject: nmap shows open UDP port 113


My friend asked me to see if I could scan or penetrate his firewall.  He
= only told me that it was a Linux box setup as a firewall running NAT
to = hide internal IPs.

- I did a nmap -O and a nmap -O --fuzzy but it said "too many =
fingerprints match for accurate OS guess"
        but it did tell me that TCP port 113 was in the closed state
- so I tried a TCP reverse inet scan (nmap -sT -I) and it still gave me
= same info as this port was closed
- so I tried nmap -sU and no results
- then I tried nmap -sU -p 113 and it said that UDP port 113 was open !!

I was then able to netcat to it (nc -u ipaddress 113) and I verified =
that I was connected with a netstat.

While connected via netcat I tried sending it commands like (ls, cd ..,
= help, echo) but got nothing.


Is there anything that can be done with this connection ??
Or is there anyway to find out what internal IPs are behind it ?


Thanks,
Bill


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You're a pen tester, but is google.com still your R&D team?
Now you can get trustworthy commercial-grade exploits and the latest
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www.coresecurity.com/promos/sf_ept1
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