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Full Discussion: Server hacked on known port
Special Forums Cybersecurity Server hacked on known port Post 303029964 by anaigini45 on Sunday 3rd of February 2019 11:58:05 PM
Old 02-04-2019
Server hacked on known port
Hi,

There is a recent case whereby it was reported that one of the production servers was hacked on port 1521. However, I am not sure how this was possible, as I checked that the OS firewall (iptables) is on :

Code:
[root@fmsproddb satellite]# /etc/init.d/iptables status
Table: nat
Chain PREROUTING (policy ACCEPT)
num  target     prot opt source               destination

Chain POSTROUTING (policy ACCEPT)
num  target     prot opt source               destination

Chain OUTPUT (policy ACCEPT)
num  target     prot opt source               destination

Table: filter
Chain INPUT (policy ACCEPT)
num  target     prot opt source               destination

Chain FORWARD (policy ACCEPT)
num  target     prot opt source               destination

Chain OUTPUT (policy ACCEPT)
num  target     prot opt source               destination

Port 1521 not open :

Code:
[root@fmsproddb satellite]# cat /etc/sysconfig/iptables
# Firewall configuration written by system-config-firewall
# Manual customization of this file is not recommended.
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -p tcp -m state --state NEW --dport 23 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT
[root@fmsproddb satellite]#

However, it is listening on port 1521 :

Code:
[root@fmsproddb satellite]# netstat -tulpn | grep 1521
tcp        0      0 :::1521                     :::*                        LISTEN      27905/tnslsnr
[root@fmsproddb satellite]#

I assume it is listening because the application is turned on, and thus the service related to port 1521 turned on and that is why it is listening on this port?

Even if the network firewall (physical) is open, if the iptables is running in the server, it should not allow port 1521 to be open/listening?
I can't think of any other way how people can hack the server on port 1521. Please help clear my doubt.
 

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LEARN ABOUT DEBIAN

net::irc::connection

Connection(3pm) 					User Contributed Perl Documentation					   Connection(3pm)

NAME

       Net::IRC::Connection - Object-oriented interface to a single IRC connection

SYNOPSIS

       Hard hat area: This section under construction.

DESCRIPTION

       This documentation is a subset of the main Net::IRC documentation. If you haven't already, please "perldoc Net::IRC" before continuing.

       Net::IRC::Connection defines a class whose instances are individual connections to a single IRC server. Several Net::IRC::Connection
       objects may be handled simultaneously by one Net::IRC object.

METHOD DESCRIPTIONS

       This section is under construction, but hopefully will be finally written up by the next release. Please see the "irctest" script and the
       source for details about this module.

AUTHORS

       Conceived and initially developed by Greg Bacon <gbacon@adtran.com> and Dennis Taylor <dennis@funkplanet.com>.

       Ideas and large amounts of code donated by Nat "King" Torkington <gnat@frii.com>.

       Currently being hacked on, hacked up, and worked over by the members of the Net::IRC developers mailing list. For details, see
       http://www.execpc.com/~corbeau/irc/list.html .

URL

       Up-to-date source and information about the Net::IRC project can be found at http://netirc.betterbox.net/ .

SEE ALSO

       o   perl(1).

       o   RFC 1459: The Internet Relay Chat Protocol

       o   http://www.irchelp.org/, home of fine IRC resources.

perl v5.8.8							    2008-01-24							   Connection(3pm)
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