ConfigServer Community Forum

Hi,
I had an issue with the firewall blocking a client who's password was changed and her phone kept trying to login triggering the bad login attempts. Since the firewall on the server changed, it took me a while to figure out that is what was happening.

I think the firewall should not have blocked her IP over the cell phone issue. If making a brute force attack, one would not use the same...

csf -r return code is 0 if CSF is disable

This cause issue with config management and scripting
trying to remote reload csf after config change but if CSF is disable the csf -r still return 0

Thank you.

Just wanted to give you a heads up in case you haven't seen this yet:

Previously when I last looked at the new databases they didn't support ASN lookups but it looks like they have added GeoLite2 ASN support now (in a separate database):

Hello,
The option for block distributed SMTP Logins is very usefull, but is necessary some advanced option to permit the automatic block of one email account involved in more than X continous distributed smtp logins.

For example, I have configured the distributed smtp logins detection to 3 diferent IP. Recently i recived from my server over 15 continuous mails alerting for distributed smtp...

I know that this has been bounced around in the forums for a while so I thought it should go in the suggestions area. We are seeing more and more servers with docker installed and it would be nice if CSF played nice with it out of the box. Basically all that needs to be done is detect if docker0 interface is present then add rules like the ones below. These are the rules that we normally add to...

Now with the recent added cluster actions the only action that we are missing is cluster ignore . Would it be possible to add? (I'm thinking the reason that it wasn't added was because the login failure daemon would have to be restarted after )

Dear ConfigServer team,

We're using CSF + LFD on many servers, with great effect ;)

One thing that could be improved in my opinion, is the detection and blocking of slow brute-force attackers, i.e. logins with long intermittent pauses, but continuing over long periods of time.

We know the effectiveness of detection of burst attacks, when more than LF_ login failures occur within LF_INTERVAL....

One class of malicious user/uncooperative person is the prober. This is the source of most traffic on my websites, and consists of trying to find weaknesses to exploit.

Typical accesss are to files and directories with names like these:

wp-login.php, wordpress, wp-includes, PMA2017, admin, mysql, db, database, phpmyadmin, program, myadmin...

Why can't csf add an option to look for sequences...

I'm not sure exactly how to call it.
I have the same problem on multiple server, we are giving email services to a company which has 10+ person working in an office . The office connects to the internet via a NATing router, so everybody is seen coming from a single IP.
Now if a single person fails his password a couple time from , that IP will be banned, and everybody will loose access .
So...

Hello,

A few weeks ago I upgraded my system from Debian Jessie 8 to Debian Stretch 9 but till yesterday I didn't notice this issue. I tried to connect to an external ftp and I connect but it is not possible to list the directory contents, strange because before the upgrade with the same CSF conf I was able to connect to this ftp. I double check CSF conf and the port 21 is in TCP_OUT, SPI...

Starting yesterday, all of our cPanel servers are getting hit with a massive amount of SMTP Authentication failures, from distributed IP addresses. Yesterday alone, we are seeing over 8000 different unique IPs involved in these distributed attacks.

The flood of LFD emails caused us some email issues. I tried to disable SMTP AUTH failure emails, or at least route them to a different email...

Hello there,

Nearly all of my servers that run Exim are constantly being attacked by remote nodes trying to brute through an AUTH command before advertised. Every day I get a big list of AUTH command used when not advertised in logwatch.

On a daily basis I'm blacklisting these remote nodes, because I know for certain they are scanning for open relays. Quite a big giveaway is also the HELO being...

can CSF be updated to use the new Cpanel mod-evasive Apache module

it's possible to do this from a simple bash command but it might be useful to less skilled users to have an option where LFD can also add an ip ban to cloudflare when the user provides an api key

might be too much to maintain for permanent rules, maybe make it part of the tempban feature?

when the feature is enabled, csf -td or csf -tr could also do the api call to cloudflare

note that...

EXPECTED:
PT_SSHDHUNG is supposed to kill sshd: unknown and sshd: unknown processes.

PROBLEM:
It doesn t kill sshd: unknown

SOLUTION:
Change the following line in lfd and add a test with SPACE at the end just like this sshd: unknown <-- note the space at the end.

from
if ($cmdline eq sshd: unknown or $cmdline eq sshd: unknown ) {
to
if ($cmdline eq sshd: unknown or $cmdline eq sshd:...

While mailscanner does not provide protection for outgoing spam I guess it could send some alerts when the EXIM queue size reaches a size that could suggest spam is being sent

Your netblock function counts number of block episodes within a class.
I would like one that counts by number of unique IP addresses within a class.

So this didn't work as *I* had intended- by your mentioning ddos mitigation it is clear that you meant this to be use against rapid fire bombardment. I, on the other hand, thought it would be useful to block repeat offender bullet-proof type hosting...

I would like to exempt alerting for our own activity in SSH - we keep a window open all day for quick access.

This results in wasteful emails all day
Subject: lfd on XXXXXX: Excessive resource usage: XXXXX (19422 (Parent PID:19420))

Time: Mon Oct 2 07:00:11 2017 -0400
Account: XXXXX
Resource: Process Time
Exceeded: 407508 > 1800 (seconds)
Executable: /usr/bin/bash
Command Line: -bash
We don't...

I want to be able to include command separated port numbers in the csf.deny file

For example I have the following:

tcp|in|d=80|s=89.248.160.0/21 scannerbots googlemapsexploit QUASINETWORKS SEYCHELLES - do not delete - Tue Apr 11 14:49:02 2017

And I want to block port 443 too

tcp|in|d=80,443|s=89.248.160.0/21 scannerbots googlemapsexploit QUASINETWORKS SEYCHELLES - do not delete - Tue Apr 11...

Hello, we are using lot's of nat in 10.0.0.0/8 for our servers. is there a possibility to add bogon network blocking to only some interfaces?

like we have a public ip on eth0 but on eth1 and eth2 we have 10.0.0.0/8 addresses. on eth0 we want bogon network blocking.

greetings from holland and many thanks.