Secure Your Apache With mod_security
Secure Your Apache With mod_security
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# Example configuration file for the mod_security Apache module
LoadModule security_module modules/mod_security.so
<IfModule mod_security.c>
# Turn the filtering engine On or Off
SecFilterEngine On
# The audit engine works independently and
# can be turned On of Off on the per-server or
# on the per-directory basis
SecAuditEngine RelevantOnly
# Make sure that URL encoding is valid
SecFilterCheckURLEncoding On
# Unicode encoding check
SecFilterCheckUnicodeEncoding On
# Only allow bytes from this range
SecFilterForceByteRange 1 255
# Cookie format checks.
SecFilterCheckCookieFormat On
# The name of the audit log file
SecAuditLog logs/audit_log
# Should mod_security inspect POST payloads
SecFilterScanPOST On
# Default action set
SecFilterDefaultAction "deny,log,status:406"
# Simple example filter
# SecFilter 111
# Prevent path traversal (..) attacks
# SecFilter "\.\./"
# Weaker XSS protection but allows common HTML tags
# SecFilter "<( |\n)*script"
# Prevent XSS atacks (HTML/Javascript injection)
# SecFilter "<(.|\n)+>"
# Very crude filters to prevent SQL injection attacks
# SecFilter "delete[[:space:]]+from"
# SecFilter "insert[[:space:]]+into"
# SecFilter "select.+from"
# Require HTTP_USER_AGENT and HTTP_HOST headers
SecFilterSelective "HTTP_USER_AGENT|HTTP_HOST" "^$"
# Only accept request encodings we know how to handle
# we exclude GET requests from this because some (automated)
# clients supply "text/html" as Content-Type
SecFilterSelective REQUEST_METHOD "!^GET$" chain
SecFilterSelective HTTP_Content-Type "!(^$|^application/x-www-form-urlencoded$|^multipart/form-data)"
# Require Content-Length to be provided with
# every POST request
SecFilterSelective REQUEST_METHOD "^POST$" chain
SecFilterSelective HTTP_Content-Length "^$"
# Don't accept transfer encodings we know we don't handle
# (and you don't need it anyway)
SecFilterSelective HTTP_Transfer-Encoding "!^$"
# Some common application-related rules from
# http://modsecrules.monkeydev.org/rules.php?safety=safe
#Nuke Bookmarks XSS
SecFilterSelective THE_REQUEST "/modules\.php\?name=Bookmarks\&file=(del_cat\&catname|del_mark\&markname|edit_cat\&catname|edit_cat\&catcomment|marks\&catname|uploadbookmarks\&category)=(<[[:space:]]*script|(http|https|ftp)\:/)"
#Nuke Bookmarks Marks.php SQL Injection Vulnerability
SecFilterSelective THE_REQUEST "modules\.php\?name=Bookmarks\&file=marks\&catname=.*\&category=.*/\*\*/(union|select|delete|insert)"
#PHPNuke general XSS attempt
#/modules.php?name=News&file=article&sid=1&optionbox=
SecFilterSelective THE_REQUEST "/modules\.php\?*name=<[[:space:]]*script"
# PHPNuke SQL injection attempt
SecFilterSelective THE_REQUEST "/modules\.php\?*name=Search*instory="
#phpnuke sql insertion
SecFilterSelective THE_REQUEST "/modules\.php*name=Forums.*file=viewtopic*/forum=.*\'/"
# WEB-PHP phpbb quick-reply.php arbitrary command attempt
SecFilterSelective THE_REQUEST "/quick-reply\.php" chain
SecFilter "phpbb_root_path="
#Topic Calendar Mod for phpBB Cross-Site Scripting Attack
SecFilterSelective THE_REQUEST "/calendar_scheduler\.php\?start=(<[[:space:]]*script|(http|https|ftp)\:/)"
# phpMyAdmin: Safe
#phpMyAdmin Export.PHP File Disclosure Vulnerability
SecFilterSelective SCRIPT_FILENAME "export\.php$" chain
SecFilterSelective ARG_what "\.\."
#phpMyAdmin path vln
SecFilterSelective REQUEST_URI "/css/phpmyadmin\.css\.php\?GLOBALS\[cfg\]\[ThemePath\]=/etc"
</IfModule>
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You can keep this configuration, but to get a better understanding of what mod_security can do, you should comment out the <IfModule mod_security.c>...</IfModule> part, restart Apache, and follow chapter 2. Afterwards you can create your own mod_security ruleset, or just switch back to this one.
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