ModSecurity supplies an array of request filtering and other security features to the Apache HTTP Server. ModSecurity is a web application layer firewall.

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How can I exclude all arguments except for a list from a ModSecurity rule at runtime?

I have a web service that handles requests from clients that I have no way to control, and only communicate with me when they call that service. A number of these clients' requests run afoul of some ...
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57 views

mod_security not working at all

I'm trying to make the mod_security work, I searched a lot on the web, and followed this tutorial to configure mod_security (all my configuration files are the same as the tutorial), and when I run ...
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1answer
46 views

How could I exclude mod_security from sub-directories on Amazon EC2 with LAMP?

I never activated before the mod_security or edit Virtual Hosts, so it's a new challenge for me, I tried to follow this tutorial but seems that most of the tutorials around the web are not reflecting ...
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1answer
37 views

whitelist URI on mod_security enabled apache reverse proxy

I have an apache 2.2.29-1.4 with mod_security 2.8.0-5.25 which is a reverse proxy with mod_proxy_http for a local java application. I have false positive on some urls and would like to whitelist some ...
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46 views

Modsecurity: Whitelist requests, Block all else?

I'm just reading up about - and experimenting with - modsecurity and hoping someone can educate a little about the method behind the madness. The approach I'd ordinarily take with any firewall is to ...
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1answer
25 views

What exactly does the ModSecurity SecCollectionTimeout directive?

I am having a little bit of trouble with a recurring "Failed deleting collection" error message from ModSecurity (see this discussion @ GitHub for some context). In the discussion of this error it is ...
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37 views

Apache server fault after configure mod-security2

I configured mod-security, from https://www.digitalocean.com/community/tutorials/how-to-set-up-mod_security-with-apache-on-debian-ubuntu . After that a restart apache service but i caught error: The ...
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84 views

mod_security and CSF protection for Wordpress - ban release issues

We're using mod_sec and CSF to protect client Wordpress logins from brute force attacks. System admin is using the popular 0134 / 0135 rule in mod_sec: SecAction ...
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5answers
5k views

mod_security block requests by http-host header

The last few days I noticed some servers being hammered with unknown requests. Most of them are like the following: 60.246.*.* - - [03/Jan/2015:20:59:16 +0200] "GET ...
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0answers
53 views

ModSecurity phase not working?

Sorry I am very new to modsecurity (2.8). So I made my first rule to block a referrer spam with the following: SecRule REQUEST_HEADERS:Referer "buttons\-for\-website\.com" ...
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3answers
156 views

Block traffic behind AWS ELB

My web servers are behind ELB, I want to block traffic from some specific user agent which is a DDOS attack. Apache always see ip address of ELB as an end user so I tried below attempts: Blocking IP ...
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34 views

Modsec XSS Filter Issue

Modsecurity is denying a particular email address and I can't figure out why. This rule has never been triggered before for me and the form where this data comes from is used hundreds of times per ...
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1answer
56 views

mod_security RBL - apparent false positive

I'm struggling with an RBL rule in mod_security under apache 2.2 that seems to be giving me a false positive. I see the following in the audit log (IP address redacted): Message: RBL lookup of ...
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1answer
192 views

mod_security ruleset for Joomla! admin

I run several hosting servers and recently I have experienced a lot of bruteforce attacks against joomla-based websites. Attackers seem to try a bruteforce against administrator/index.php page. I ...
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1answer
142 views

Mod Security ctl:ruleEngine=Off Whitelist Fails in Phase 1

Background info : cPanel server with atomicorp ruleset, plus our own custom rules and whitelists in separate .conf files - Apache 2.2, modsec 2.8 Whitelist rule: SecRule REMOTE_ADDR ...
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1answer
238 views

mod_security not blocking empty useragent requests

I can't get mod_security to block empty useragent requests. I am not very saavy with it so after searching I found this rule: SecMarker BEGIN_UA_CHECK SecRule &REQUEST_HEADERS:User-Agent "@eq 0" ...
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3answers
464 views

Test whether mod_security is actually working

I'm running this on my staging server for the first time and I think I did everything correctly. I can see entries in modsec_audit.log when I run nikto2 against it, but for the life of me I can't ...
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32 views

Server wont let me save URLs to MySQL database?

I am posting here because all other forum say it's a server environ issue. I have a site with the ModX CMS on it hosted on a GoDaddy server (not sure about the specific setup is as client has ...
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0answers
27 views

ModSecurity on IIS: Single threaded?

I installed ModSecurity on a web server running IIS 8.5, and noticed the response time has increased 15 times (0.15 ms/request vs. 2.2 ms/request), even with SecEngine set to off. It seems that IIS is ...
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1answer
78 views

Proper SSL config for SSL - Apache2 ignores DocumentRoot

So here's my current config: <VirtualHost *:443> DocumentRoot "/var/www/keypad" ServerName keypad.io SSLOptions +StrictRequire <Directory /> SSLRequireSSL ...
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1answer
44 views

Fine-grained control over mod_security logging

I installed mod_security2 on several dozen servers (each with several dozen VHosts) and don't have the time to configure it for every VHost. In the default configuration, it produces copious amounts ...
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28 views

What is /stop in my server logs?

Why do my server logs show GET requests to /stop? I believe this is due to modsecurity but cannot determine why or the importance.
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153 views

mod-security not blocking POST request

I have a mod-security compiled from source and installed on Ubuntu Server 12.04, Apache 2.2.22. I loaded the OWASP core rule set, and I can see them getting triggered on the log file ...
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331 views

Server Mod_security Error “406 Not Acceptable” WHM/cPanel [1234123413]

When i try to access one of the domains from browser i get an "406 Not acceptable" error. after doing a little research i figure out is due to rule ID [1234123413]. Now my concerns are: if i ...
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1answer
183 views

Simple DoS protection with mod_security?

I have mod security2 in ubuntu 14.04 LTS server. I saw the below tutorial: http://blog.cherouvim.com/simple-dos-protection-with-mod_security/ The above sadly do not work on me apache error : * ...
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166 views

How to filter POST data with mod_security when type is text/xml?

I'm trying to craft a rule which would match certain regex in POST requests. Rule I have so far looks like; SecRule REQUEST_FILENAME "form.php" \ "id:'12345',chain,deny,status:406,log,msg:'foobar ...
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2answers
151 views

PHP and Text Area Triggering Mod_Security

I have some text areas in a form that are posted back and stored using PHP / MySQL. However, if a user presses return for a new line in the text area, mod_security is blocking it with the below log ...
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1answer
109 views

How i can block requests for a specific page?

I would like to completely delete or block access to a specific page in my site. More specifically, I have seen this exploit "Joomla COM_MEDIA Exploit" : ...
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1answer
38 views

Mod Security2 deactivation rule only from a specified IP addresses

Is it possible to disable a rule by Mod Security2, only for one specified IP addresses? Only for one specified IP addresses & only for one specified path ( /administrator ) ? I tried this: ...
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1answer
148 views

Modsecurity Preventing Access to WSDL

I have installed mod_security with the OWASP rule set and it is now blocking my ability to call a web service using a WSDL. When my code tries to make the web service call, I see the below in the mod ...
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1answer
1k views

Mod_security - Syntax error

I have a password protected directory on my web server. To protect that from brute force attack, I tried to add the IP-Based BLocking config as below in the apache2 config file. But everytime I ...
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1answer
141 views

Apache error_log filled with modsec blocks

Ever since I enabled Apache modsecurity I've been checking the logs and been seeing the following constantly like 24/7: [Wed Jun 25 12:40:07 2014] [error] [client 112.215.65.61] ModSecurity: Access ...
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2answers
952 views

modsecurity apache mod-security.conf missing [closed]

Greetings Serverfaultians. I'm not a server guy as you can see from my noob score of 1 point. But maybe those more versed can help me. I'm using Ubuntu v13.10 32-bit Server and Apache2 v2.4.6 and I'm ...
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126 views

Nginx and dynamic X-Forwarded-For blocklist

I am running Nginx behind a proxy. I am getting visitors' real IP addresses through X-Forwarded-For HTTP request header. I'd like to block individual IPs based on a dynamic block list, up to 10000+ ...
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1answer
499 views

csf lfd denied by desktop because of mod_security

I have a WHM/Cpanel server with CSF/LFD installed and mod_security enabled. I used to login to WHM/cpanel from one of my local windows box through a linux (Centos 5)NAT gateway(with a public IP ...
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118 views

Nginx + mod_security without a backend server

I want to start using mod_security for Nginx. However, I have read the official doc and something got my atention: ...
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332 views

Error install mod_security on nginx

I have problem when install mod_security on nginx. I add flagment on /etc/nginx/nginx.conf server { listen 80; server_name localhost; location / { ModSecurityEnabled ...
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112 views

External Web Application Firewall infront of IIS

We have a public facing IIS webserver hosting an ASP website which is not very secure, to say the least. I have found out several serious flaws in the last few months and would like to do something ...
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342 views

Curl Sourced DDoS: How to detect it & how to stop?

Okay, an Ubuntu server I manage fell victim to a DDoS attack today. Usually this is unpleasant but not that big a deal. A few high server load moments & then it passes. Today was clearly ...
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100 views

Hardening of ubuntu server.How to prevent overkill checks? How to detect genuine request from attacks?

I have followed one these hardening check list tutorials where I have noticed that there fail2ban installed and denyhost at the same time. To my knowledge fail2ban does a little more than what ...
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96 views

Mod_security pause rule does not work without a redirect following it

I've been trying to get mod_security to do a simple pause when a counter has reached the value 2. I am using mod_security 2.6.8 on CentOS 5 (from EPEL repo). The pause does not get executed unless ...
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1answer
100 views

Blocking request with query string

I'm an under a DDoS attack though I have cloud flare.. I found out that the attacker is accessing the server using query strings "?a=randomnumber" I don't use query strings in my website so I need ...
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1answer
476 views

apache2 reverse proxy broken after modsecurity is installed ubuntu on 12.04.1

this is the first time I have run into issue like this one. I have a java application setting behind a apache2 using mod_ajp on 8009. I have noticed that I could not get the client's IP so I have ...
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1answer
440 views

Apache/ModSecurity - Blocking HTML Textarea with 403 when it contains a linebreak (enter key)?

I have a contact form, within this contact form is a textarea. If i fill out the contact form and in the test area, i enter one line of text, e.g. Example The form completes and i am notified via ...
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2answers
1k views

mod_security 960015 blocks Google and other good bots

mod_security rule 960015 keeps catching Google and other good bots. I have the following in the vhost to prevent good bots from being caught: SecRule REQUEST_HEADERS:User-Agent "Mail.ru" log,allow ...
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87 views

Modsec: Set env variable based on User-agent

Relatively new to Apache modsec. Trying to do something simple and hitting a wall. I want to set an environment variable based on the User-Agent, and test it by setting a header. I have this: ...
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181 views

How to solve UNIQUE_ID variable issue in modsecurity_crs_16_session_hijacking.conf ubuntu 10.04

I have been trying to harden ubuntu 10.04 using modsecurity and its core rules from owasp version 2.2.5. I have used the package from their github . After the symbolic link of the files in the ...
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2answers
2k views

mod_security configuration issue: Error parsing actions: Unknown action: ver

I am trying to install / configure mod-sec using this tutorial, which uses the OWASP ModSecurity Core Rule Set. However when I go to restart apache, I get the following error: Syntax error on line 53 ...
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2answers
6k views

How to turn off mod_security 2 on apache cpanel?

Preface I have been banging my head searching and trying to figure out why I am getting a 406 error on some occasions: Not Acceptable: An appropriate representation of the requested resource / could ...
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2answers
94 views

How to use Modsec rules to certain page?

i want to block proxy(x-forwarded) ip certain page(wp-comments-post.php) using Apache Mod_security. my current mod_security rule: SecRule REQUEST_HEADERS_NAMES "^x-forwarded-for" ...