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Old 09-18-2011, 02:26 AM   #1
Brian Murphy
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Registered: Feb 2011
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UDP Ports open?


Why would these UDP Ports be open?
Zenmap found these open.

17077/udp open|filtered unknown
17459/udp open|filtered unknown
19632/udp open|filtered unknown
19647/udp open|filtered unknown
21320/udp open|filtered unknown
21524/udp open|filtered unknown
22341/udp open|filtered unknown
36384/udp open|filtered unknown
38412/udp open|filtered unknown

Thanks
 
Old 09-18-2011, 06:36 AM   #2
karthik18121986
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Hi,
All the above mentioned port numbers are invalid. You can confirm it by following the link: http://en.wikipedia.org/wiki/List_of...P_port_numbers
 
Old 09-18-2011, 06:03 PM   #3
devwatchdog
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Quote:
Originally Posted by karthik18121986 View Post
Hi,
All the above mentioned port numbers are invalid. You can confirm it by following the link: http://en.wikipedia.org/wiki/List_of...P_port_numbers
While they may not have anything officially assigned to them, it isn't as if something can't be bound to those ports. If I wanted to bind openvpn to port 17077, there's nothing to stop me from doing so.

As for the OP, I'd recommend looking at the output of the following command, to be run as root:

Code:
netstat -pantu
Which will show something of this nature:

Code:
[root@node1 ~]# netstat -pantu
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name   
tcp        0      0 10.20.72.66:3306            0.0.0.0:*                   LISTEN      3332/mysqld         
tcp        0      0 0.0.0.0:111                 0.0.0.0:*                   LISTEN      1271/portmap        
tcp        0      0 127.0.0.1:631               0.0.0.0:*                   LISTEN      1517/cupsd          
tcp        0      0 10.20.72.66:3000            0.0.0.0:*                   LISTEN      3564/ntop           
tcp        0      0 10.20.72.66:3001            0.0.0.0:*                   LISTEN      3564/ntop           
tcp        0      0 0.0.0.0:639                 0.0.0.0:*                   LISTEN      1305/rpc.statd      
tcp        0      0 :::80                       :::*                        LISTEN      1826/httpd          
tcp        0      0 :::22                       :::*                        LISTEN      1509/sshd           
tcp        0   1152 ::ffff:10.20.72.66:22       ::ffff:10.17.5.156:43580    ESTABLISHED 5893/sshd: nedx [pr 
tcp        0      0 ::ffff:10.20.72.66:22       ::ffff:10.17.5.156:49398    ESTABLISHED 5588/sshd: nedx [pr 
udp        0      0 0.0.0.0:2055                0.0.0.0:*                               3564/ntop           
udp        0      0 0.0.0.0:5353                0.0.0.0:*                               1893/avahi-daemon:  
udp        0      0 0.0.0.0:111                 0.0.0.0:*                               1271/portmap        
udp        0      0 0.0.0.0:50293               0.0.0.0:*                               3188/openvpn        
udp        0      0 0.0.0.0:631                 0.0.0.0:*                               1517/cupsd          
udp        0      0 0.0.0.0:58617               0.0.0.0:*                               1893/avahi-daemon:  
udp        0      0 0.0.0.0:633                 0.0.0.0:*                               1305/rpc.statd      
udp        0      0 20.25.15.142:123            0.0.0.0:*                               1531/ntpd           
udp        0      0 127.0.0.1:123               0.0.0.0:*                               1531/ntpd           
udp        0      0 0.0.0.0:123                 0.0.0.0:*                               1531/ntpd           
udp        0      0 0.0.0.0:636                 0.0.0.0:*                               1305/rpc.statd      
udp        0      0 :::42013                    :::*                                    1893/avahi-daemon:  
udp        0      0 :::5353                     :::*                                    1893/avahi-daemon:  
udp        0      0 fe80::217:3eff:fe1d:123     :::*                                    1531/ntpd           
udp        0      0 ::1:123                     :::*                                    1531/ntpd           
udp        0      0 :::123                      :::*                                    1531/ntpd
You will see what ports are open, what app is bound to them, and the process ID as well.
 
  


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