How to Secure your WordPress Website - WordCamp UK 2014

WordCamp UK 2014
How to Secure your
WordPress Website
Mike Pead
www.primaryimage.com

About Me!
 Web design for 15 years
 Based in Essex & London
 Founded Primary Image
in 2010
 Mainly work with
small/medium sized
businesses
2

About Me!
 Manage WordPress hosting
for clients
 100% WordPress
 Handle all their security,
including WordPress
updates
3

 Why worry about
WordPress security?
 Steps you can take to
secure your site…
Today’s Talk

? Why is WordPress vulnerable?

% of WordPress Usage
23
60
All Websites CMS Websites
%
That’s over 70 million
websites in the world!
Half are self-hosted.
Only a fraction of
sites change from
the default
configuration.
6
1
2
3
%

! = WordPress is an attractive
target to hackers due to its
popularity – a victim of its
own success!

? So why did I get interested
in WordPress security?

How to Secure your WordPress Website - WordCamp UK 2014

Most attacks are automated
(i.e. bots)!

Analysis by Wordfence
Looked at 26 million
"page not found“
reports from
30,000
websites
15

Bot URL requests
• 4th place: 102,800 requests: /wp-login.php
• 7th place: 31,800 requests: /wp-login.php?action=register
• 10th place: 24,000 requests: /wp-comments-post.php
• 11th place: 22,300 requests: /administrator/
• 23rd place: 14,200 requests: /wp-content/themes/GeoPlaces/monetize/
• 45th place: 8,500 requests: /author=1
Source: http://www.wordfence.com/blog/2014/05/top-100-page-not-found-errors-for-wordpress/
16

?
So what does a botnet
attack look like?

Consequences of an attack…
19
Website
becomes
inaccessible
Lose
brand
reputation
Lose SEO /
become
blacklisted

So is WordPress Secure?
21
• YES IT IS!
• And trusted by some
of the biggest names
in the world:

Are you sure it’s secure?
• Most vulnerabilities are found in plugins and
hosting environment, not the WordPress core.
• WordPress is extremely good (& quick) at
rolling out security fixes when issues are
found.
• Many techniques used to attack WordPress
could be applied to other types of CMS too.
22

But there are precautions you
can take to secure your site …!

And the WordPress Codex
itself gives some tips:
http://codex.wordpress.org/
Hardening_WordPress
!

? What simple steps can I
take to secure my site?

01 Keep WordPress updated
• WHY? WordPress is open-source – means
anyone can see what vulnerabilities have been
fixed between versions.
• HOW?
 One-click upgrades are easy, quick &
reliable.
• Today you should all be using WordPress 3.9.1.
26

• Survey of 350+ NHS WordPress websites:
27
Source: Terence Eden
http://shkspr.mobi/blog/2014/03/2000-nhs-security/vulnerabilities-disclosed/

• I alerted the Trade & Investment (UKTI) Government
department in March they were
using WP 3.4.2 for their blog:
– released in 2012
– 9 security updates had been
issued
28

02 Keep plugins updated
• WHY? Can be a big hole for allowing attacks.
• HOW?
 If running multiple sites, use a service
such as WP Remote (free) to check and
install plugin updates in one dashboard.
–How often do you check & install plugin
updates?
29

03 Only use trusted plugins
• WHY? Not all plugins can be trusted!
• HOW?
 Get the plugin from wordpress.org or a
trusted source.
 How many downloads / reviews has it got?
 When was it last updated?
30

04 Only use trusted themes
• WHY? Themes can have poorly written code,
or worse – purposely malicious code included.
• HOW?
 Get the theme from a trusted source.
 Examine the code yourself.
 Be aware of Base64 code:
TWFuIGlzIGRpc3Rpbmd1aXNoZWQsIG5vdCBvbmx5IGJ5IGh
pcyByZWFzb24sIGJ1dCBieSB0aGlzmd1aXNoZWQsIG5vdCft
31

05 Choose a secure password
• WHY? Brute force attacks mainly rely on using
dictionary words.
• HOW?
 Use characters, numbers, capitals, etc.
 Use a unique password, don’t use the same
for every login on the internet!
 Change it regularly, at least every 3 months.
 Make sure other users also have strong passwords.
 This includes your FTP, cPanel & other passwords too!
32

06 No “admin” usernames
• WHY? Any element of predictability gives
hackers an edge. Bots will try this first!
• HOW?
 Setup a new admin account with a
unique username.
 Delete the existing admin account.
33

07 You need decent hosting
• WHY? Attacks can exploit vulnerabilities at a
server-level. Don’t let your hosting account be
the weak link.
• HOW?
 Choose a reputable host, perhaps those
that specialise in WordPress.
 Budget hosts may not always have their
focus on security.
34

08 Keep regular backups!
• WHY? If the worst comes to the worst, have a
clean backup you can restore to!
• HOW?
 Download a copy to your
computer.
 Use an external service,
e.g. myRepono.
 Frequency to depend on
how often your site is updated!
35

? Want more powerful steps to
secure your WordPress site…

09 Restrict login attempts
• WHY? Detect and block brute force attacks.
• HOW?
 Install a plugin
such as iThemes
Security.
37

38
• Setup differently depending on whether it’s just you or
members of the public logging-in!

• BUT THERE ARE FLAWS
IN THIS METHOD:
Botnet attacks can
come from 1000s of
IP addresses.
39

• How about BruteProtect? It logs every failed
attempt community-wide.
Botnet attacks can come from 1000s of IP
addresses.
40

10 Switch on SSL encryption
• WHY? Secures
the traffic between
the server and your
computer, inc. your
password.
• HOW?
 Buy an SSL certificate from your host.
 Force WP-Admin SSL in iThemes Security.
41

11 Obscurity
• WHY? Make it harder for bots to scan for your
WordPress version.
• HOW?
42

12 Change your database prefix
• WHY? Default MySQL tables easy to guess.
• HOW? Use iThemes Security or Change Database Prefix
43

404 detection blocking
“Away mode”
Set “allow” IP addresses
Changing directory URLs as
they can break plugins
Automatic edits to key files
Enforcing strong passwords
for subscribers
Blocking whole countries
Things I don’t recommend:

• WHY? Provides another
hurdle for unauthorised
users trying to login.
• HOW?
 Google Authenticator
45
13 Two-Factor Authentication

14 Monitor what’s happening
• WHY? If you have a multi-author site, check
what they’re doing!
• HOW? Plainview Activity Monitor
46

15 Block access to system files
• WHY? You don’t want
prying eyes looking at
these sensitive files!
• HOW?
 Add some rules to your .htaccess file.
48

# protect files
<files wp-config.php>
Order deny,allow
Deny from all
</files>
<files readme.html>
Order allow,deny
Deny from all
</files>
50
<files license.txt>
Order allow,deny
Deny from all
</files>
<files install.php>
Order allow,deny
Deny from all
</files>
<files error_log>
Order allow,deny
Deny from all
</files>

Recommended on the WordPress Codex:
# Block the include-only files.
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^wp-admin/includes/ - [F,L]
RewriteRule !^wp-includes/ - [S=3]
RewriteRule ^wp-includes/[^/]+.php$ - [F,L]
RewriteRule ^wp-includes/js/tinymce/langs/.+.php - [F,L]
RewriteRule ^wp-includes/theme-compat/ - [F,L]
</IfModule>
51

16 Build your own firewall
• WHY? Stop dodgy requests from even
reaching your WordPress installation
– block them at server level.
• HOW?
 Again, add some rules to the .htaccess file.
52

Extract from 5G Blacklist
(http://perishablepress.com/5g-blacklist-2013)
# 5G:[QUERY STRINGS]
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{QUERY_STRING} ("|%22).*(<|>|%3) [NC,OR]
RewriteCond %{QUERY_STRING} (javascript:).*(;) [NC,OR]
RewriteCond %{QUERY_STRING} (<|%3C).*script.*(>|%3) [NC,OR]
RewriteCond %{QUERY_STRING} (|../|`|='$|=%27$) [NC,OR]
RewriteCond %{QUERY_STRING}
(;|'|"|%22).*(union|select|insert|drop|update|md5|benchmark|or|and|if) [NC,OR]
RewriteCond %{QUERY_STRING} (base64_encode|localhost|mosconfig) [NC,OR]
RewriteCond %{QUERY_STRING} (boot.ini|echo.*kae|etc/passwd) [NC,OR]
RewriteCond %{QUERY_STRING} (GLOBALS|REQUEST)(=|[|%) [NC]
RewriteRule .* - [F]
</IfModule>
53

<IfModule mod_alias.c>
RedirectMatch 403 (https?|ftp|php)://
RedirectMatch 403 /(https?|ima|ucp)/
RedirectMatch 403 /(Permanent|Better)$
RedirectMatch 403 (='|=%27|/'/?|).css()$
RedirectMatch 403 (,|)+|/,/|{0}|(/(|...|+++|||"")
RedirectMatch 403 .(cgi|asp|aspx|cfg|dll|exe|jsp|mdb|sql|ini|rar)$
RedirectMatch 403 /(contac|fpw|install|pingserver|register).php$
RedirectMatch 403 (base64|crossdomain|localhost|wwwroot|e107_)
RedirectMatch 403 (eval(|_vti_|(null)|echo.*kae|config.xml)
RedirectMatch 403 .well-known/host-meta
RedirectMatch 403 /function.array-rand
RedirectMatch 403 );$(this).html(
RedirectMatch 403 proc/self/environ
RedirectMatch 403 msnbot.htm)._
RedirectMatch 403 /ref.outcontrol
RedirectMatch 403 com_cropimage
RedirectMatch 403 indonesia.htm
RedirectMatch 403 {$itemURL}
RedirectMatch 403 function()
RedirectMatch 403 labels.rdf
RedirectMatch 403 /playing.php
RedirectMatch 403 muieblackcat
</IfModule>
54
More…!

RewriteCond %{HTTP_USER_AGENT} (havij|libwww-perl|wget|python|nikto|curl|scan|java|winhttp|clshttp|loader)[NC,OR]
RewriteCond %{HTTP_USER_AGENT} (%0A|%0D|%3C|%3E|%00)[NC,OR]
RewriteCond %{HTTP_USER_AGENT} (;|<|>|'|"|)|(|%0A|%0D|%22|%27|%28|%3C|%3E|%00).*(libwww-perl|wget|python|nikto|curl|scan|java|winhttp|HTTrack|clshttp|archiver|loader|email|harvest|extract|grab|miner)[NC,OR]
RewriteCond %{THE_REQUEST} (?|*|%2a)+(%20+|s+|%20+s+|s+%20+|s+%20+s+)HTTP(:/|/)[NC,OR]
RewriteCond %{THE_REQUEST} etc/passwd[NC,OR]
RewriteCond %{THE_REQUEST} cgi-bin [NC,OR]
RewriteCond %{THE_REQUEST} (%0A|%0D|r|n)[NC,OR]
RewriteCond %{REQUEST_URI} owssvr.dll [NC,OR]
RewriteCond %{HTTP_REFERER} (%0A|%0D|%3C|%3E|%00)[NC,OR]
RewriteCond %{HTTP_REFERER} .opendirviewer.[NC,OR]
RewriteCond %{HTTP_REFERER} users.skynet.be.* [NC,OR]
RewriteCond %{QUERY_STRING} [a-zA-Z0-9_]=http://[NC,OR]
RewriteCond %{QUERY_STRING} [a-zA-Z0-9_]=(..//?)+ [NC,OR]
RewriteCond %{QUERY_STRING} [a-zA-Z0-9_]=/([a-z0-9_.]//?)+ [NC,OR]
RewriteCond %{QUERY_STRING} =PHP[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12} [NC,OR]
RewriteCond %{QUERY_STRING} (../|%2e%2e%2f|%2e%2e/|..%2f|%2e.%2f|%2e./|.%2e%2f|.%2e/)[NC,OR]
RewriteCond %{QUERY_STRING} ftp: [NC,OR]
RewriteCond %{QUERY_STRING} http:[NC,OR]
RewriteCond %{QUERY_STRING} https: [NC,OR]
RewriteCond %{QUERY_STRING} =|w| [NC,OR]
RewriteCond %{QUERY_STRING} ^(.*)/self/(.*)$ [NC,OR]
RewriteCond %{QUERY_STRING} ^(.*)cPath=http://(.*)$[NC,OR]
RewriteCond %{QUERY_STRING} (<|%3C).*script.*(>|%3E)[NC,OR]
RewriteCond %{QUERY_STRING} (<|%3C)([^s]*s)+cript.*(>|%3E) [NC,OR]
RewriteCond %{QUERY_STRING} (<|%3C).*embed.*(>|%3E)[NC,OR]
RewriteCond %{QUERY_STRING} (<|%3C)([ê]*e)+mbed.*(>|%3E) [NC,OR]
RewriteCond %{QUERY_STRING} (<|%3C).*object.*(>|%3E) [NC,OR]
RewriteCond %{QUERY_STRING} (<|%3C)([ô]*o)+bject.*(>|%3E) [NC,OR]
RewriteCond %{QUERY_STRING} (<|%3C).*iframe.*(>|%3E) [NC,OR]
RewriteCond %{QUERY_STRING} (<|%3C)([î]*i)+frame.*(>|%3E)[NC,OR]
RewriteCond %{QUERY_STRING} base64_encode.*(.*)[NC,OR]
RewriteCond %{QUERY_STRING} base64_(en|de)code[^(]*([^)]*)[NC,OR]
RewriteCond %{QUERY_STRING} GLOBALS(=|[|%[0-9A-Z]{0,2})[OR]
RewriteCond %{QUERY_STRING} _REQUEST(=|[|%[0-9A-Z]{0,2})[OR]
RewriteCond %{QUERY_STRING} ^.*((|)|<|>|%3c|%3e).*[NC,OR]
RewriteCond %{QUERY_STRING} ^.*(x00|x04|x08|x0d|x1b|x20|x3c|x3e|x7f).* [NC,OR]
RewriteCond %{QUERY_STRING} (NULL|OUTFILE|LOAD_FILE) [OR]
RewriteCond %{QUERY_STRING} (.{1,}/)+(motd|etc|bin)[NC,OR]
RewriteCond %{QUERY_STRING} (localhost|loopback|127.0.0.1)[NC,OR]
RewriteCond %{QUERY_STRING} (<|>|%0A|%0D|%3C|%3E|%00)[NC,OR]
RewriteCond %{QUERY_STRING} concat[^(]*([NC,OR]
RewriteCond %{QUERY_STRING} union([^s]*s)+elect [NC,OR]
RewriteCond %{QUERY_STRING} union([â]*a)+ll([^s]*s)+elect [NC,OR]
RewriteCond %{QUERY_STRING} -[sdcr].*(allow_url_include|allow_url_fopen|safe_mode|disable_functions|auto_prepend_file) [NC,OR]
RewriteCond %{QUERY_STRING} (;|<|>|'|"|)|%0A|%0D|%22|%27|%3C|%3E|%00).*(/*|union|select|insert|drop|delete|update|cast|create|char|convert|alter|declare|order|script|set|md5|benchmark|encode)[NC,OR]
RewriteCond %{QUERY_STRING} (sp_executesql)[NC]
RewriteRule ^(.*)$ - [F,L]
# END BPSQSE BPS QUERY STRING EXPLOITS
55
BulletProof Security adds 43 lines of rules to the .htaccess file!

• CHECK OUT…
 The 5G 2013 list: http://perishablepress.com/5g-
blacklist-2013/
 The htaccess file generated by
BulletProof Security
 WordPress Codex
56

17 Hide the .htaccess file itself!
• HOW?
# STRONG HTACCESS PROTECTION
<Files ~ "^.*.([Hh][Tt][Aa])">
order allow,deny
deny from all
satisfy all
</Files>
57

18 Protect your WP-Admin area
• Problem with login limits plugins:
–Query database for every request
–Run a lot of server processes
–Fill up your MySQL database
58

59
WP-Admin
MySQL Database

STEP 1: Use your hosting control panel to
password protect the WP-Admin
directory
60

End up with this:
61

• STEP 2: New htaccess file in the WP-Admin folder:
AuthType basic
AuthUserFile "/home/example.co.uk/wp-admin//.htpasswd"
AuthGroupFile /dev/null
AuthName "ENTER YOUR LOGIN DETAILS"
Require valid-user
<Files admin-ajax.php>
Order allow,deny
Allow from all
Satisfy any
</Files>
ErrorDocument 401 /401error.html
62

• STEP 3: Add this to your root htaccess:
<Files wp-login.php>
AuthType Basic
AuthUserFile "/home/example.co.uk/wp-admin//.htpasswd"
AuthGroupFile /dev/null
AuthName "ENTER YOUR LOGIN DETAILS"
Require valid-user
</Files>
ErrorDocument 401 /401error.html
63

64
Presented to the user:

65
Create a custom 401 error page:

• Benefits:
–Blocks bad bots at server-level
–Less server resources needed than firing up
WordPress
–Works ok with public logins if using a front-
end login form (e.g. ‘Theme My Login’
plugin with the front-end widget)
66

19 Block PHP in Uploads folder
• WHY? Uploads folder can be used by other users.
• HOW?
 Create a .htaccess file in the
WP-Content/Uploads folder, with the following:
<Files *.php>
Deny from All
</Files>
67

20 Tighten PHP configuration
• WHY? Helps block PHP code injection
vulnerabilities caused by bad input filtering.
• HOW?
 Add a php.ini file in your root directory and
paste in some code…
68

20 Tighten PHP configuration
; Disable allow_url_fopen in php.ini for security reasons
allow_url_fopen = Off
; Disable allow_url_include in php.ini for security reasons
allow_url_include = Off
; Disable display_errors in php.ini for security reasons
display_errors = Off
log_errors = On
69

21 Create your own encryption keys
• WHY? Makes an attackers job harder.
• HOW?
 Open up wp-config.php, scroll down to
“Authentication Unique Keys and Salts”.
 Generate your own keys at:
https://api.wordpress.org/secret-key/1.1/salt/
70

22 Move WP-Config location
• WHY? Take wp-config.php out of a publicly
accessible location.
• HOW? Move it one level up, outside of your
public_html folder:
71

23 Folder permissions
• WHY? Can be a security hole if permissions
are not strong enough.
• HOW?
 Use your FTP software’s
CHMOD feature.
72

23 Folder permissions
 All folders should have a CHMOD of 755.
 All "wp-" PHP files = 644.
 wp-config.php = 640.
 htaccess files = 644.
 robot.txt = 755.
 sitemap.xml = 666.
73

Don’t forget the basics:
• Keep WordPress and your plugins updated.
• Have a secure password.
• Get decent quality hosting.

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How to Secure your WordPress Website - WordCamp UK 2014

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