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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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KA-FORWARDER(8) 					       AFS Command Reference						   KA-FORWARDER(8)

NAME
ka-forwarder - Forward AFS Authentication Server requests to another server SYNOPSIS
ka-forwarder [-p <port>] <server>[/<port>] [...] DESCRIPTION
ka-forwarder listens for requests for an AFS Authentication Server and forwards them to a remove fakeka server. fakeka is a server that answers AFS Authentication Server protocol requests using a regular Kerberos KDC and is provided with some Kerberos 5 implementations. fakeka has to run on the same host as the Kerberos KDC, however, and AFS clients send all native AFS authentication requests to the AFS database servers. If you don't want to run your Kerberos KDCs and your AFS database servers on the same host, run ka-forwarder on the AFS database servers and point it to fakeka running on the Kerberos KDCs. ka-forwarder takes one or more servers to which to forward the requests. The default port on the remote server to which to forward the command is 7004, but a different port can be specified by following the server name with a slash ("/") and the port number. If multiple servers are given, ka-forwarder will send queries to each server in turn in a round-robin fashion. CAUTIONS
Due to the way that ka-forwarder distinguishes from client requests and server responses, any messages from one of the servers to which ka- forwarder is forwarding will be considered a reply rather than a command and will not be forwarded. This means that the servers running fakeka will not be able to use native AFS authentication requests and rely on ka-forwarder to send the requests to the right server. ka-forwarder does not background itself. It should either be run in the background via the shell, or run via the Basic OverSeer Server (see bosserver(8)). OPTIONS
-p <port> By default, ka-forwarder listens to the standard AFS Authentication Server port (7004). To listen to a different port, specify it with the -p option. EXAMPLES
Forward AFS Authentication Server requests to the fakeka servers on kdc1.example.com and kdc2.example.com: % ka-forwarder kdc1.example.com kdc2.example.com & Note the "&" to tell the shell to run this command in the background. PRIVILEGE REQUIRED
ka-forwarder only has to listen to port 7004 and therefore does not require any special privileges unless a privileged port is specified with the -p option. SEE ALSO
bosserver(8), fakeka(8), kaserver(8) COPYRIGHT
Copyright 2006 Russ Allbery <rra@stanford.edu> This documentation is covered by the IBM Public License Version 1.0. This man page was written by Russ Allbery for OpenAFS. OpenAFS 2012-03-26 KA-FORWARDER(8)
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