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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jifty::script::server

Jifty::Script::Server(3pm)				User Contributed Perl Documentation				Jifty::Script::Server(3pm)

NAME

       Jifty::Script::Server - A standalone webserver for your Jifty application

SYNOPSIS

	   jifty server
	   jifty server --port 6666
	   jifty server --stop

DESCRIPTION

       Starts and stops Jifty's standalone web server.

   options
       --port  The port to run the server on. Overrides the port in the config file, if it is set there. The default port is 8888.

       --user USER
	       The user to become after binding to the port.  It is advised that you use this when binding to low ports, instead of running as
	       "root".	This option only works if the server is using a Net::Server subclass.

       --group GROUP
	       The group to become after binding to the port.  Like "--user", this option only works if the server is using a Net::Server
	       subclass.

       --host HOSTNAME
	       The host to bind to.  This option only works if the server is using a Net::Server subclass.

       --stop  Stops the server, if it is running.  This is accomplished by reading the PID from "var/jifty-server.pid"

       --restart
	       restart the server, if it is running. This is accomplished by killing the child pid, and let parent pid create a new one

       --sigready SIGNAL
	       Sets the signal number that should be sent to the server's parent process when the server is ready to accept connections.

       --quiet Reduces the amount of debug output sent by the server

       --dbiprof
	       Turns on DBI profiling; see DBI::ProfileDumper.

       --help  Print a brief help message and exits.

       --man   Prints the manual page and exits.

DESCRIPTION

       When you're getting started with Jifty, this is the server you want. It's lightweight and easy to work with.

METHODS

   run
       "run" takes no arguments, but starts up a Jifty server process for you.

perl v5.14.2							    2010-12-08						Jifty::Script::Server(3pm)