ModSecurity: OWASP CRS3 menambahkan

sumber: https://2buntu.com/articles/1571/installing-lamp-modsecurity-modsecurity-crs-on-ubuntu-1604/

Install Apache

sudo add-apt-repository ppa:ondrej/php
sudo apt-get update

apt-get install apache2 php7.0 php7.0-xmlrpc php7.0-mysql php7.0-gd php7.0-cli \
php7.0-curl mysql-client mysql-server dovecot-common dovecot-imapd \
dovecot-pop3d postfix squirrelmail squirrelmail-decode php7.0 php5.6 \
php5.6-mysql php-gettext php5.6-mbstring php-mbstring php7.0-mbstring \
php-xdebug libapache2-mod-php5.6 libapache2-mod-php7.0

sudo apt-get install libxml2 libxml2-dev libxml2-utils \
libaprutil1 libaprutil1-dev

Install ModSecurity

sudo su
apt update
apt -y install libapache2-modsecurity

Ubuntu 20.04

apt -y install libapache2-mod-security2

cek

apachectl -M | grep --color security

Install ModSecurity Core Rule Set (CRS)

Instalasi dari Github

rm -rf /usr/share/modsecurity-crs
apt-get install -y git
git clone https://github.com/SpiderLabs/owasp-modsecurity-crs.git /usr/share/modsecurity-crs
cp /usr/share/modsecurity-crs/crs-setup.conf.example /usr/share/modsecurity-crs/crs-setup.conf

Silahkan baca2 file crs-setup.conf kalau mau mengerti cara / proses deteksi. Ada bagian PARANOID :) ..

Setup ModSecurity CRS

mkdir -p /usr/share/modsecurity-crs/activated_rules/
cd /usr/share/modsecurity-crs
for f in `ls rules`; do sudo ln -s ../rules/$f activated_rules/$f; done

Konfigurasi

Edit modsecurity.conf agar

mv /etc/modsecurity/modsecurity.conf-recommended /etc/modsecurity/modsecurity.conf
vi /etc/modsecurity/modsecurity.conf

Ubah

SecRuleEngine DetectionOnly

menjadi

SecRuleEngine On

Edit security2.conf

vi /etc/apache2/mods-available/security2.conf

Tambahkan IncludeOptional /usr/share/modsecurity-crs/activated_rules/*.conf

<IfModule security2_module>
        # Default Debian dir for modsecurity's persistent data
        SecDataDir /var/cache/modsecurity

        # Include all the *.conf files in /etc/modsecurity.
        # Keeping your local configuration in that directory
        # will allow for an easy upgrade of THIS file and
        # make your life easier
        IncludeOptional /etc/modsecurity/*.conf
        Include "/usr/share/modsecurity-crs/*.conf"
        Include "/usr/share/modsecurity-crs/activated_rules/*.conf"
</IfModule>

Reload Apache

Enable module

a2enmod headers
a2enmod security2
service apache2 reload

Cara Disable module

a2dismod headers
a2dismod security2
service apache2 reload

Test

Jika anda menginstalasi DVWA, bisa di lakukan test ke DVWA dengan kondisi module di enable / disable.

XSS

curl 'http://localhost/?q="><script>alert(1)</script>'

SQLi

curl "http://localhost/?q='1 OR 1=1"

Responds

Harusnya akan dapat kode kira-kira

403 Forbidden

Cek Log

watch -n 2 "tail /var/log/apache2/modsec_audit.log"

atau

tail -f /var/log/apache2/modsec_audit.log

Referensi

• https://2buntu.com/articles/1571/installing-lamp-modsecurity-modsecurity-crs-on-ubuntu-1604/