Joomla! security

Presentation “Joomla! Security” - http://slideshare.net/yireoJisse Reitsma ([email protected]) - Twitter @yireo

Joomla! security


My name is J isse Reitsma

Joomla! enthousiast

PHP programmer

Lead developer of Yireo

Joomla! templates-book (NL)

Helping Tibet Support Group


My presentation

Part I - Basics

Part II - Joomla! security

Part III - Advanced things


Part IBasics of security


Why bother?

Everybody makes mistakes

Joomla! is very popular ... also with hackers

What can happen?Website defacement (damage to business image)

Malware installed (viruses, exploits, zombie-software)


What is security?

SQL injection

POST spoofing

Path traversal; Remote path inclusion

Cross Site Scripting (XSS), CSRF

Session hijacking, cookie theft

Rootkits


Common Joomla! attacks

SQL injectionhttp://localhost/joomla/index.php/weblinks-categories?id=0%20%29%20union%20select%20password%20from%20%60jos_users%60%20--%20%29

XSS vulnerabilityTextarea: <script>alert('test');</script>


Part IIJoomla! security


Joomla! security (1)

Strong passwordsBeware for dictionary attacks

At least 8 characters, preferably 16 :)



Do not pick just any extension

Keep software up-to-dateJoomla! core

Joomla! extensions



Make sure .htaccess is in placeRename from “htaccess.txt” to “.htaccess”

Includes quick protection for common attacks



Create a new Super UserNo username “admin”

Other MySQL ID then 42 or 62



Backend protectionjSecure, kSecure, BackendToken

ScanningRsFirewall, jDefender, jHackGuard

Joomla! ACLs (ACLmanager)


Joomla! security (6)Remove the default META-tag generator<?php JFactory::getDocument()>setGenerator('whatever'); ?>


Joomla! security (7)Encrypt Joomla! Administrator access with (self-generated) SSL-certificate

Use SFTP (or SSH) if available, and not FTP


Joomla! security (8)Remove files you don't need

3rd party templates, 3rd party extensions

Joomla! test setups (and other applications)

CHANGELOG.php, CREDITS.php, INSTALL.php, configuration.php-dist, htaccess.txt, LICENSE.php, LICENSES.php

phpinfo.php


Joomla! security (9)Two Factor Authentication

Google Authenticator

Yubikey


Joomla! security (10)Do not use Joomla! 1.5

Change database table prefix (Admintools)

Do not allow user registration if you don't want it

Apache HTTP authentication for backend


General adviceBe careful with what you install

Versioning system like Git

Always test things first on testing environment (plg_system_httpauth)

Create backups


Part IIIAdvanced security


LAMP security

File permissions

Firewall

Apache settings

PHP settings


UNIX fi le permissionsBasic rules

Three numbers: owner + group + world

4 = read, 2 = write, 1 = execute

644 = readwrite for owner; read for group; read for world

Directory must always be executable (755 instead of 644)

Do not use:666 = read-write for owner; read-write for group; read-write for world

777 (same like files, but plus execution bit)

Do use:644 (files)

755 (directories)


Firewall

Only allow what you needHTTP, SSH, FTP, SMTP, DNS

Block everything you don't needMySQL, IMAP, POP

Check with Nmap


Apache security

Apache settingsServerTokens Prod

ServerSignature off

TraceEnable off

Apache modulesmod_rewrite

mod_evasive

mod_antiloris

mod_security2


PHP security (1 of 2)

PHP settingsregister_globals = Off

expose_php = Off

safe_mode = Off

magic_quotes = Off

allow_url_include = Off

allow_url_fopen = On???

open_basedir = [yoursite]???


PHP security (2 of 2)

PHP disable_functionsshow_source

system, shell_exec, exec, passthru

popen, proc_open

phpinfo

PHP modulesSuhosin


Too late . . .

maldet (malware detector)

rkhunter (rootkit hunter)

IDS (intrusion detection system)Tripwire

Samhain


UNIX hacking...

the greatest game on the internet


“ Ignorance is bliss”

Google Hacking database makes it easy

SSL-certificates are only secure, if SSL root-authority servers are

We trust TCP/IP to be fairly secure, but is it? (slowloris)

When the C-code of a rootkit is actually modified by a script-kiddie, it is no longer detected by rootkit-scanners - bummer, nobody knows if it's there


docs.joomla.org/Security


any questions?

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