Fail2ban

Instalando Apache e Fail2Ban

apt-get install fail2ban apache2

ajustes básico

cp /etc/fail2ban/jail.conf /etc/fail2ban/jail.local
sed -i '30s/600/3600/g' /etc/fail2ban/jail.local
sed -i '34s/600/3600/g' /etc/fail2ban/jail.local
sed -i '35s/3/6/g' /etc/fail2ban/jail.local
sed -i '111s/action_/action_mwl/g' /etc/fail2ban/jail.local

proteção contra ataque no phpmyadmin

Acrescentar em /etc/fail2ban/jail.local

[phpmyadmin]
enabled = true
filter   = phpmyadmin
port = http,https
logpath = /var/log/apache2/access.log
action = iptables-multiport[name=phpmyadmin, port="http,https", protocol=tcp]
maxretry = 2
bantime = 84600

criar um arquivo em /etc/fail2ban/filter.d/phpmyadmin.conf com conteúdo:

[Definition]
failregex = \[client <HOST>\] File does not exist:.*(?i)phpmyadmin.*
            \[client <HOST>\] File does not exist:.*(?i)manager.*
            \[client <HOST>\] File does not exist:.*(?i)setup.*
            \[client <HOST>\] File does not exist:.*(?i)mysql.*
            \[client <HOST>\] File does not exist:.*(?i)sqlweb.*
            \[client <HOST>\] File does not exist:.*(?i)webdb.*
            \[client <HOST>\] File does not exist:.*(?i)pma.*
            \[client <HOST>\] File does not exist:.*(?i)vtigercrm.*
            ^<HOST>.*GET.*(?i)phpmyadmin.*
            ^<HOST>.*GET.*(?i)manager.*
            ^<HOST>.*GET.*(?i)setup.*
            ^<HOST>.*GET.*(?i)mysql.*
            ^<HOST>.*GET.*(?i)sqlweb.*
            ^<HOST>.*GET.*(?i)webdb.*
            ^<HOST>.*GET.*(?i)pma.*
            ^<HOST>.*GET.*(?i)vtigercrm.*
           
ignoreregex =

Reiniciar o fail2ban

service fail2ban restart

Aplicar regras para ações já realizadas

fail2ban-regex /var/log/apache2/access.log /etc/fail2ban/filter.d/phpmyadmin.conf

desbloqueando IP

fail2ban-client set phpmyadmin unbanip 192.168.100.9

lista os filtros

fail2ban-client status

lista o status do filtro

fail2ban-client status phpmyadmin

proteção contra ataque ao wordpress

acrescentar em /etc/fail2ban/jail.local

[wordpress]
enabled = true
filter = wordpress
port = http,https
action = iptables-multiport[name=wordpress, port="http,https", protocol=tcp]
logpath = /var/log/apache2/access.log
bantime = 84600
maxretry = 6

e crie o /etc/fail2ban/filter.d/wordpress.conf com o conteúdo

[Definition]
failregex = ^<HOST> .* "POST .*xmlrpc\.php
            ^<HOST> .* "POST .*wp-cron\.php.*
            ^<HOST> .* "POST .*wp-login\.php
ignoreregex =

proteção contra ataque sqlinject

[sqlinject]
enabled = true
filter = sqlinject
port = http,https
action = iptables-multiport[name=sqlinject, port="http,https", protocol=tcp]
logpath = /var/log/apache2/access.log
bantime = 84600
maxretry = 6

e crie o /etc/fail2ban/filter.d/sqlinject.conf com o conteúdo

# Fail2Ban configuration file
#
# Author: TrogloGeek (Damien VERON)
#
# $Revision: 1 $
#

[Definition]

sqlfragments_generic = select.*from|delete.*from|update.*set|insert.*into|replace.*(value|set)
sqlfragments_havij = and(\+|%%20)ascii%%28substring|and(\+|%%20)Length|union(\+|%%20)all(\+|%%20)select|and(\+|%%20)1%%3C1|and(\+|%%20)1%%3D1|and(\+|%%20)1%%3E1|and(\+|%%20)%%27.%%27%%3D%%27|%%2F\*%%21[0-9]+((\+|%%20)[0-9]*)?\*%%2F

# Option:  failregex
# Notes.:  Regex to try to detect SQL injection trials
# Values:  TEXT
#
failregex = ^<HOST> -[^"]*"[A-Z]+\s+/[^"]*\?[^"]*(?:%(sqlfragments_generic)s|%(sqlfragments_havij)s)[^"]*HTTP[^"]*"

# Option:  ignoreregex
# Notes.:  regex to ignore. If this regex matches, the line is ignored.
# Values:  TEXT
#
ignoreregex =

x00

[nginx-x00]
enabled  = true
port     = http,https
filter   = nginx-x00
logpath  = /var/log/nginx/access.log
bantime = 3600
maxretry = 1

e em /etc/fail2ban/filter.d/nginx-x00.conf

[Definition]

failregex = ^<HOST> .* ".*\\x.*" .*$

ignoreregex =

• https://serverfault.com/questions/772833/fail2ban-regex-to-block-x00-requests

Drupal 7 (CVE-2018-7600 / SA-CORE-2018-002)

/etc/fail2ban/jail.local

[drupalgeddon2]
enabled = true
filter = drupalgeddon2
port = http,https
action = iptables-multiport[name=drupalgeddon2, port="http,https", protocol=tcp]
#logpath  = /var/log/apache2/*.log
logpath  = /var/log/nginx/*.log
bantime = 84600
maxretry = 1

em /etc/fail2ban/filter.d/drupalgeddon2.conf

[Definition]
failregex = ^<HOST> .* ".*passthru&name.*" .*$
                ^<HOST>.*GET.*(?i)passthru&name.*
ignoreregex =

• https://github.com/dreadlocked/Drupalgeddon2
• https://github.com/pimps/CVE-2018-7600
• https://www.drupal.org/forum/support/post-installation/2018-04-21/drupalgeddon-hacks-are-starting-to-show-up
• https://wojnowski.net.pl/main/index/dissecting-mister-spy-bot-website-hack

Referências

• https://www.fail2ban.org/wiki/index.php/HOWTO_apache_myadmin_filter
• https://www.digitalocean.com/community/tutorials/how-to-protect-an-apache-server-with-fail2ban-on-ubuntu-14-04
• https://github.com/TrogloGeek/fail2ban-apache-sqlinject