Server hacked on known port Post: 303029986

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Special Forums Cybersecurity Server hacked on known port Post 303029986 by Neo on Monday 4th of February 2019 07:04:49 AM

02-04-2019

Administrator

Guys,

iptables -L lists all the rules used by iptables.

When it returns:

Code:

iptables -L
Chain INPUT (policy ACCEPT)
target     prot opt source               destination

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

This means there are NO RULEs loaded, there are no ports being blocked. Nada. There is no filtering going on.

Nothing.

The server is wide open, based on the iptables -L output provided (from an iptables perspective).

The original poster wanted to know how a port was accessed because they thought they had iptable() working on their server.

iptables -L shows, definitively, what rules are being used, and it is case there are NO RULES.

This means, from an iptables perspective, the server is wide open.

That is why an intruder was able to gain access (not discussing, of course, any other issues on the server).

The OP apparently has written a bunch of rules, but does not understand how to enable or manage iptables().

Cheers.

Neo

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ip6tables-save

IPTABLES-SAVE(8)                                                  iptables 1.6.1                                                  IPTABLES-SAVE(8)

NAME

       iptables-save -- dump iptables rules to stdout

       ip6tables-save -- dump iptables rules to stdout

SYNOPSIS

       iptables-save [-M modprobe] [-c] [-t table]

       ip6tables-save [-M modprobe] [-c] [-t table]

DESCRIPTION

       iptables-save  and ip6tables-save are used to dump the contents of IP or IPv6 Table in easily parseable format to STDOUT. Use I/O-redirect-
       ion provided by your shell to write to a file.

       -M, --modprobe modprobe_program
              Specify the path to the modprobe program. By default, iptables-save will inspect /proc/sys/kernel/modprobe  to  determine  the  exe-
              cutable's path.

       -c, --counters
              include the current values of all packet and byte counters in the output

       -t, --table tablename
              restrict output to only one table. If not specified, output includes all available tables.

BUGS

       None known as of iptables-1.2.1 release

AUTHORS

       Harald Welte <laforge@gnumonks.org>
       Rusty Russell <rusty@rustcorp.com.au>
       Andras Kis-Szabo <kisza@sch.bme.hu> contributed ip6tables-save.

SEE ALSO

       iptables-apply(8),iptables-restore(8), iptables(8)

       The  iptables-HOWTO, which details more iptables usage, the NAT-HOWTO, which details NAT, and the netfilter-hacking-HOWTO which details the
       internals.

iptables 1.6.1                                                                                                                    IPTABLES-SAVE(8)