Server hacked on known port Post: 303029984

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Special Forums Cybersecurity Server hacked on known port Post 303029984 by bakunin on Monday 4th of February 2019 06:37:06 AM

02-04-2019

Registered User

If i remember correctly 1521 is one of the standard ports for the Oracle listener, so i suppose you have an Oracle database running there. That the listener listens is quite as it should be, no?

What makes you think the server "was hacked"?

I mean, iptables is just a packet filter and as such it cannot discern between legitimate content and an illegitimate one. It filters packets based on IP address (layer 3) and port (layer 4), nothing more, nothing less. Obviously you need to allow traffic to the configured port of the listener otherwise the database would not be usable. So either you allow this port or you disable it (eventually restricting to a certain range of IP addresses), but what content goes over this port (i.e. legitimate database queries vs. malicious content) the packet filter is the wrong tool to assess. For that you will need a "stateful inspection" type of firewall which iptables is not.

Also be aware that the concept of "host based firewalls" is a flawed one per design. A hosts role is either providing a service (that is: some application) OR providing firewall services, but not both! The reason is you don't want the host you want to protect run the firewall itself, beause in this scenario the malicious packages already have reached the interface they are trying to attack. You want the firewall in front of (and separated from) the host you try to protect so that the malicious content doesn't even reach the interface you want to protect.

I hope this helps.

bakunin

Last edited by bakunin; 02-04-2019 at 05:08 PM.. Reason: confused "stateful inspection" with "deep state inspection" - oh, the paranoia

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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)