Code:
# Check Content-Length and reject all non numeric ones
SecRule REQUEST_HEADERS:Content-Length "!^\d+$" "deny,log,auditlog,msg:'Content-Length HTTP header is not numeric', severity:'2',id:'960016'"
# Do not accept GET or HEAD requests with bodies
SecRule REQUEST_METHOD "^(GET|HEAD)$" "chain,deny,log,auditlog,msg:'GET or HEAD requests with bodies', severity:'2',id:'960011'"
SecRule REQUEST_HEADERS:Content-Length "!^0?$"
# Require Content-Length to be provided with every POST request.
SecRule REQUEST_METHOD "^POST$" "chain,deny,log,auditlog,msg:'POST request must have a Content-Length header',id:'960012',severity:'4'"
SecRule &REQUEST_HEADERS:Content-Length "@eq 0"
# Don't accept transfer encodings we know we don't know how to handle
SecRule HTTP_Transfer-Encoding "!^$" "deny,log,auditlog,msg:'ModSecurity does not support transfer encodings',id:'960013',severity:'5'"
# Check decodings
SecRule REQUEST_FILENAME|ARGS|ARGS_NAMES|REQUEST_HEADERS|!REQUEST_HEADERS:Referer "@validateUrlEncoding" \
"chain, deny,log,auditlog,msg:'URL Encoding Abuse Attack Attempt',id:'950107',severity:'4'"
SecRule REQUEST_FILENAME|ARGS|ARGS_NAMES|REQUEST_HEADERS|!REQUEST_HEADERS:Referer "\%(?![0-9a-fA-F]{2}|u[0-9a-fA-F]{4})"
SecRule REQUEST_FILENAME|ARGS|ARGS_NAMES|REQUEST_HEADERS|!REQUEST_HEADERS:Referer "@validateUtf8Encoding" "deny,log,auditlog,msg:'UTF8 Encoding Abuse Attack Attempt',id:'950801',severity:'4'"
# Proxy access attempt
SecRule REQUEST_URI ^http:/ "deny,log,auditlog,msg:'Proxy access attempt', severity:'2',id:'960014'"
#
# Restrict type of characters sent
SecRule REQUEST_FILENAME|REQUEST_HEADERS_NAMES|REQUEST_HEADERS|!REQUEST_HEADERS:Referer \
"@validateByteRange 1-255" \
"log,auditlog,msg:'Request Missing an Accept Header', severity:'2',id:'960015',t:urlDecodeUni,phase:1"
SecRule ARGS|ARGS_NAMES "@validateByteRange 1-255" \
"deny,log,auditlog,msg:'Invalid character in request',id:'960901',severity:'4',t:urlDecodeUni,phase:2"
# allow request methods
SecRule REQUEST_METHOD "!^((?:(?:POS|GE)T|OPTIONS|HEAD))$" \
"phase:1,log,auditlog,msg:'Method is not allowed by policy', severity:'2',id:'960032'"
# Restrict file extension
# removed exe so that frontpage will work
# Restricted HTTP headers
SecRule REQUEST_HEADERS_NAMES "\.(?:Lock-Token|Translate|If)$" \
"deny,log,auditlog,msg:'HTTP header is restricted by policy',id:'960038',severity:'4'"
SecRule HTTP_User-Agent "(?:\b(?:m(?:ozilla\/4\.0 \(compatible\)|etis)|webtrends security analyzer|pmafind)\b|n(?:-stealth|sauditor|essus|ikto)|b(?:lack ?widow|rutus|ilbo)|(?:jaascoi|paro)s|internet explorer|webinspect|\.nasl)" \
"deny,log,auditlog,msg:'Request Indicates a Security Scanner Scanned the Site',id:'990002',severity:'2'"
SecRule REQUEST_HEADERS_NAMES "\bacunetix-product\b" \
"deny,log,auditlog,msg:'Request Indicates a Security Scanner Scanned the Site',id:'990901',severity:'2'"
SecRule REQUEST_FILENAME "^/nessustest" \
"deny,log,auditlog,msg:'Request Indicates a Security Scanner Scanned the Site',id:'990902',severity:'2'"
SecRule REQUEST_HEADERS:User-Agent "(?:m(?:ozilla\/(?:4\.0 \(compatible; advanced email extractor|2\.0 \(compatible; newt activex; win32\))|ailto:craftbot\@yahoo\.com)|e(?:mail(?:(?:collec|harves|magne)t|(?: extracto|reape)r|siphon|wolf)|(?:collecto|irgrabbe)r|xtractorpro|o browse)|a(?:t(?:tache|hens)|utoemailspider|dsarobot)|w(?:eb(?:emailextrac| by mail)|3mir)|f(?:astlwspider|loodgate)|p(?:cbrowser|ackrat|surf)|(?:digout4uagen|takeou)t|(?:chinacla|be)w|hhjhj@yahoo|rsync|shai|zeus)" \
"deny,log,auditlog,msg:'Rogue web site crawler',id:'990012',severity:'2'"
SecRule REQUEST_HEADERS:User-Agent "(?:\b(?:(?:indy librar|snoop)y|microsoft url control|lynx)\b|d(?:ownload demon|isco)|w(?:3mirror|get)|l(?:ibwww|wp)|p(?:avuk|erl)|cu(?:sto|rl)|big brother|autohttp|netants|eCatch)" \
"chain,log,auditlog,msg:'Request Indicates an automated program explored the site',id:'990011',severity:'5'"
SecRule REQUEST_HEADERS:User-Agent "!^apache.*perl"
# Session fixation
SecRule REQUEST_FILENAME|ARGS|ARGS_NAMES|REQUEST_HEADERS|!REQUEST_HEADERS:Referer "(?:\.cookie\b.*?;\W*?(?:expires|domain)\W*?=|\bhttp-equiv\W+set-cookie\b)" \
"capture,ctl:auditLogParts=+E,log,auditlog,msg:'Session Fixation. Matched signature <%{TX.0}>',id:'950009',severity:'2'"
# Blind SQL injection
SecRule REQUEST_FILENAME|ARGS|ARGS_NAMES|REQUEST_HEADERS|!REQUEST_HEADERS:Referer "(?:\b(?:(?:s(?:ys\.(?:user_(?:(?:t(?:ab(?:_column|le)|rigger)|object|view)s|c(?:onstraints|atalog))|all_tables|tab)|elect\b.{0,40}\b(?:substring|ascii|user))|m(?:sys(?:(?:queri|ac)e|relationship|column|object)s|ysql.user)|c(?:onstraint_type|harindex)|attnotnull)\b|(?:locate|instr)\W+\()|\@\@spid\b)" \
"capture,t:replaceComments,ctl:auditLogParts=+E,log,auditlog,msg:'Blind SQL Injection Attack. Matched signature <%{TX.0}>',id:'950007',severity:'2'"
SecRule REQUEST_FILENAME|ARGS|REQUEST_HEADERS|!REQUEST_HEADERS:Referer "\b(?:(?:s(?:ys(?:(?:(?:process|tabl)e|filegroup|object)s|c(?:o(?:nstraint|lumn)s|at)|dba|ibm)|ubstr(?:ing)?)|user_(?:(?:(?:constrain|objec)t|tab(?:_column|le)|ind_column|user)s|password|group)|a(?:tt(?:rel|typ)id|ll_objects)|object_(?:(?:nam|typ)e|id)|pg_(?:attribute|class)|column_(?:name|id)|(?:dba|mb)_users|xtype\W+\bchar|rownum)\b|t(?:able_name\b|extpos\W+\())" \
"capture,t:replaceComments,ctl:auditLogParts=+E,log,auditlog,msg:'Blind SQL Injection Attack. Matched signature <%{TX.0}>',id:'950904',severity:'2'"
# SQL injection
SecRule REQUEST_FILENAME|ARGS|ARGS_NAMES|REQUEST_HEADERS|!REQUEST_HEADERS:Referer "(?:\b(?:(?:s(?:elect\b(?:.{1,100}?\b(?:(?:length|count|top)\b.{1,100}?\bfrom|from\b.{1,100}?\bwhere)|.*?\b(?:d(?:ump\b.*\bfrom|ata_type)|(?:to_(?:numbe|cha)|inst)r))|p_(?:(?:addextendedpro|sqlexe)c|(?:oacreat|prepar)e|execute(?:sql)?|makewebtask)|ql_(?:longvarchar|variant))|xp_(?:reg(?:re(?:movemultistring|ad)|delete(?:value|key)|enum(?:value|key)s|addmultistring|write)|e(?:xecresultset|numdsn)|(?:terminat|dirtre)e|availablemedia|loginconfig|cmdshell|filelist|makecab|ntsec)|u(?:nion\b.{1,100}?\bselect|tl_(?:file|http))|group\b.*\bby\b.{1,100}?\bhaving|load\b\W*?\bdata\b.*\binfile|(?:n?varcha|tbcreato)r|autonomous_transaction|open(?:rowset|query)|dbms_java)\b|i(?:n(?:to\b\W*?\b(?:dump|out)file|sert\b\W*?\binto|ner\b\W*?\bjoin)\b|(?:f(?:\b\W*?\(\W*?\bbenchmark|null\b)|snull\b)\W*?\()|(?:having|or|and)\b\s+?(?:\d{1,10}|'[^=]{1,10}')\s*?[=<>]+|(?:print\]\b\W*?\@|root)\@|c(?:ast\b\W*?\(|oalesce\b))|(?:;\W*?\b(?:shutdown|drop)|\@\@version)\b|'(?:s(?:qloledb|a)|msdasql|dbo)')" \
"capture,t:replaceComments,ctl:auditLogParts=+E,log,auditlog,msg:'SQL Injection Attack. Matched signature <%{TX.0}>',id:'950001',severity:'2'"
SecRule REQUEST_FILENAME|ARGS|REQUEST_HEADERS|!REQUEST_HEADERS:Referer "\b(?:user_(?:(?:object|table|user)s|password|group)|a(?:tt(?:rel|typ)id|ll_objects)|object_(?:(?:nam|typ)e|id)|pg_(?:attribute|class)|column_(?:name|id)|substr(?:ing)?|table_name|mb_users|rownum)\b" \
"capture,t:replaceComments,ctl:auditLogParts=+E,log,auditlog,msg:'SQL Injection Attack. Matched signature <%{TX.0}>',id:'950906',severity:'2'"
# XSS
SecRule REQUEST_FILENAME|ARGS|ARGS_NAMES|REQUEST_HEADERS "(?:\b(?:on(?:(?:mo(?:use(?:o(?:ver|ut)|down|move|up)|ve)|key(?:press|down|up)|c(?:hange|lick)|s(?:elec|ubmi)t|(?:un)?load|dragdrop|resize|focus|blur)\b\W*?=|abort\b)|(?:l(?:owsrc\b\W*?\b(?:(?:java|vb)script|shell)|ivescript)|(?:href|url)\b\W*?\b(?:(?:java|vb)script|shell)|background-image|mocha):|type\b\W*?\b(?:text\b(?:\W*?\b(?:j(?:ava)?|ecma)script\b| [vbscript])|application\b\W*?\bx-(?:java|vb)script\b)|s(?:(?:tyle\b\W*=.*\bexpression\b\W*|ettimeout\b\W*?)\(|rc\b\W*?\b(?:(?:java|vb)script|shell|http):)|(?:c(?:opyparentfolder|reatetextrange)|get(?:special|parent)folder)\b|a(?:ctivexobject\b|lert\b\W*?\())|<(?:(?:body\b.*?\b(?:backgroun|onloa)d|input\b.*?\\btype\b\W*?\bimage)\b|!\[CDATA\[|script|meta)|(?:\.(?:(?:execscrip|addimpor)t|(?:fromcharcod|cooki)e|innerhtml)|\@import)\b)" \
"capture,ctl:auditLogParts=+E,log,auditlog,msg:'Cross-site Scripting (XSS) Attack. Matched signature <%{TX.0}>',id:'950004',severity:'2'"
# file injection
SecRule REQUEST_FILENAME|ARGS|ARGS_NAMES|REQUEST_HEADERS "(?:\b(?:\.(?:ht(?:access|passwd|group)|www_?acl)|global\.asa|httpd\.conf|boot\.ini)\b|\/etc\/)" \
"capture,ctl:auditLogParts=+E,deny,log,auditlog,msg:'Remote File Access Attempt. Matched signature <%{TX.0}>',id:'950005',severity:'2'"
# Command access
SecRule REQUEST_FILENAME "\b(?:n(?:map|et|c)|w(?:guest|sh)|cmd(?:32)?|telnet|rcmd|ftp)\.exe\b" \
"capture,ctl:auditLogParts=+E,deny,log,auditlog,msg:'System Command Access. Matched signature <%{TX.0}>',id:'950002',severity:'2'"
# Command injection
SecRule ARGS|ARGS_NAMES|REQUEST_HEADERS "(?:\b(?:(?:n(?:et(?:\b\W+?\blocalgroup|\.exe)|(?:map|c)\.exe)|t(?:racer(?:oute|t)|elnet\.exe|clsh8?|ftp)|(?:w(?:guest|sh)|rcmd|ftp)\.exe|echo\b\W*?\by+)\b|c(?:md(?:(?:32)?\.exe\b|\b\W*?\/c)|d(?:\b\W*?[\\\/]|\W*?\.\.)|hmod.{0,40}?\+.{0,3}x))|[\;\|\`]\W*?\b(?:(?:c(?:h(?:grp|mod|own|sh)|md|pp|c)|p(?:asswd|ython|erl|ing|s)|n(?:asm|map|c)|f(?:inger|tp)|(?:kil|mai)l|(?:xte)?rm|ls(?:of)?|telnet|uname|echo|id)\b|g(?:\+\+|cc\b))|\/(?:c(?:h(?:grp|mod|own|sh)|pp|c)|p(?:asswd|ython|erl|ing|s)|n(?:asm|map|c)|f(?:inger|tp)|(?:kil|mai)l|g(?:\+\+|cc)|(?:xte)?rm|ls(?:of)?|telnet|uname|echo|id)(?:[\'\"\|\;\`\-\s]|$))" \
"capture,ctl:auditLogParts=+E,deny,log,auditlog,msg:'System Command Injection. Matched signature <%{TX.0}>',id:'950006',severity:'2'"
SecRule "ARGS|ARGS_NAMES|REQUEST_HEADERS|!REQUEST_HEADERS:User-Agent" \
"\bwget\b" \
"capture,ctl:auditLogParts=+E,deny,log,auditlog,msg:'System Command Injection. Matched signature <%{TX.0}>',id:'950907',severity:'2'"
# SSI injection
SecRule REQUEST_FILENAME|ARGS|ARGS_NAMES|REQUEST_HEADERS "<!--\W*?#\W*?(?:e(?:cho|xec)|printenv|include|cmd)" \
"capture,ctl:auditLogParts=+E,deny,log,auditlog,msg:'SSI injection Attack. Matched signature <%{TX.0}>',id:'950011',severity:'2'"
# PHP injection
SecRule REQUEST_FILENAME|ARGS|ARGS_NAMES|REQUEST_HEADERS "(?:(?:\b(?:f(?:tp_(?:nb_)?f?(?:ge|pu)t|get(?:s?s|c)|scanf|write|open|read)|gz(?:(?:encod|writ)e|compress|open|read)|s(?:ession_start|candir)|read(?:(?:gz)?file|dir)|move_uploaded_file|(?:proc_|bz)open)|\$_(?:(?:pos|ge)t|session))\b|<\?(?!xml))" \
"capture,ctl:auditLogParts=+E,deny,log,auditlog,msg:'PHP Injection Attack. Matched signature <%{TX.0}>',id:'950013',severity:'2'"
