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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319 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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143 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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586 views

Dropping incoming requests for a specific file with iptables

Server is a standard LAMP stack configured via cpanel on CentOS 5.9. We have one file, call it bad.php, on one of our domains that is mistakenly being accessed about 10 times a second by a service ...
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804 views

mod_security2.so: undefined symbol: ap_unixd_set_gl

service httpd restart Stopping httpd: [ OK ] Starting httpd: httpd: Syntax error on line 205 of /etc/httpd/conf/httpd.conf: Cannot load ...
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26 views

Does a mod_security error block a visitor?

Does a mod_security execution/rule error or errors in general block users from visiting my website? Ive got many rule and execution errors, Ive just whitelisted these rules but maybe I could just ...
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81 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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45 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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695 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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509 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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91 views

Proxying while preserving URI with mod_security2

I'm using a proxy: action in mod_security2. I'd like to preserve the full URL of the original request, however, and it seems to be rewriting that to the url in my proxy: action. So a request to ...
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848 views

Nginx with mod_security support

I have compiled nginx with mod_security support. In error log I can see the support for mod_security 2012/08/27 11:13:11 [info] 602096#0: ModSecurity for nginx/2.7.0-rc2 ...
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23 views

How can I fix this error on mod_security: AH00526: Syntax error … /etc/modsecurity/modsecurity.conf

Following this tutorial I tried to verify if the mod_security module was loaded on my Apache2. apachectl -M | grep --color security I got this error message: AH00526: Syntax error on line 187 of ...
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117 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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536 views

ModSecurity on Apache (Debian Wheezy), Authentication logging

I am new to ModSecurity, it works great on the server, but I would like to control the way it logs things. For example as I am troubleshooting my website in order to whitelist or correct php coding ...
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16 views

How to get mod_security to log all POST data?

I currently have a CentOS system that is successfully logging relevant mod_security actions to the audit log file. The following is my configuration: <IfModule mod_security2.c> SecRuleEngine ...
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81 views

ModSecurity phase not working?

I have installed 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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251 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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142 views

Custom collections with mod_security

I would like to create a mod_security collection that is based on something other than the user's IP, Session ID, or username. Specifically, based on the REQUEST_URI. However, mod_security indicates ...
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18 views

Test for length of ARG parameter in SecRule - Mod Security

What is the most efficient way to limit the length of a http request parameter using Mod Security? For example, to limit WordPress comment length : SecRule ARGS:comment "^.{65530}" Would this regex ...
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47 views

mod_security rule to block GET requests via querystring or referer

In the last days in my VPS there are many many GET requests on 1 file that cause a high memory load (all came from a single refer url, with different IPs). Until now I've blocked these requests via ...
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49 views

ModSecurity on Apache 2.2 in EC2 - HTTP Status 413 messages dropped

Hi I am running Mod_Security on Ubuntu instances in EC2 behind an Elastic Loadbalancer. The app is a Ruby App. I have set SecRequestBodyLimit 293601280 When I upload files below that size, they ...
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43 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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158 views

Apache mod_security crs blocking PDF files

I've just installed CRS for Apache mod_security and it's reporting all PDF files as possible attacks. Specificaly, it's the modsecurity_crs_20_protocol_violations.conf that's causing the trouble ...
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389 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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198 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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79 views

ModSecurity: What do MULTIPART_DATA_BEFORE and MULTIPART_DATA_AFTER mean?

I'm getting the following ModSecurity error when posting form data to a LiquidWeb server: Multipart request body failed strict validation: PE 0, BQ 0, BW 0, DB 1, DA 1, HF 0, LF 0, SM 0, IQ 0, IP 0, ...
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171 views

nginx with fail2ban and mod_security

I forgot to update my fail2ban config for nginx. I just moved to nginx from apache. Today, I got a lot of cals from a single IP. IP tried to access login pages with post and get methods IP tried to ...
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373 views

How do I handle apache2 modsecurity2 warnings like Match of “rx ^OPTIONS$” against “REQUEST_METHOD” required?

After upgrade from squeeze to wheezy I get loads of these messages in my apache errorlog when I open a webpage on myserver, (changed to myserver.de here): [Sat Oct 19 01:06:21 2013] [error] [client ...
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761 views

ModSecurity: collections_remove_stale: Failed deleting collection

Environment: Ubuntu Server 12.04 64Bit with Apache/2.2.22 (Ubuntu) and Worker mpm with modsecurity 2.7.5 and OWASP CRS latest. Problem: When server is under a load of 1500 concurrent users ...
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190 views

apache DirectoryMatch matching filenames

I have the following code in my security.conf file of apache <DirectoryMatch "/(albums|attachment(s)?|upload(s)?)"> Options -ExecCGI <IfModule php5_module> php_flag engine off ...
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546 views

short Apache outages (VPS, ModSecurity)

I have a problem with my site recently hosted at Liquidweb, none of their techs seems to be able to solve this issue even after days. Was hoping I could get some help here. Occasionally, my site's ...
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157 views

log/dump response body

Is there any way to log response body in Apache 2? I need the exact content that will be sent to user browser. I tried mod_security audit logging, but it won't log response body for all requests. ...
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13 views

ModSecurity - zeroing out false positives

In ModSecurity, I'm getting a lot of false positives. Is there anyway to 'zero out' the cookie value for any cookies causing false positives?
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9 views

Apache header order

I am working on a private server application for a web based mobile game that uses php to generate responses. In order to do this I am trying to replicate the behavior of the main server as closely as ...
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21 views

mod_fcgid - Cannot allocate memory

I discovered yesterday some Errors on Apache2 Log and looking how to solve it somehow. My Problem is that I do not know where to start. As a Noob I am it is a little bit hard for me to get it solved. ...
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17 views

ModSecurity: Output filter: Response body data memory allocation failed

Can anybody tell me what this errors means? Could not find a really good results for it. [Sat May 09 11:15:42 2015] [error] [client 52.1.123.91] ModSecurity: Output filter: Response body data memory ...
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67 views

ModSecurity + Nginx “SecRule” startup error

I've installed Nginx (1.8.0) + ModSecurity (2.9.0) from source on OpenBSD (5.6), without problems. But when I try to configure modsecurity with the default config, upon starting nginx I get: ...
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47 views

apache mod_evasive with mpm_prefork settings to work

I have tried to find all the information I could on this and I understand the problem with mod_evasive not working when the server is in the mpm_prefork mode (instead of worker). However, I was able ...
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28 views

WAF at Transparent Mode

I want to use Mod Security as transparent mode. Mod security web application firewall (WAF) should be between server and client and client provided with only server's IP address to access the site. ...
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68 views

prevent phpbb bruteforcing with mod_security

Update: I edited this and added a fail2ban tag. Perhaps that might be another way to handle this issue. I'm running phpbb 3.0.13-PL1 and I would like to protect the login page from bruteforcing. I'm ...
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25 views

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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188 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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58 views

SecAuditLogParts not working: mod_security keeps logging response body

I have set SecAuditLogParts in modsecurity.conf to just log ABFH, but the modsecurity audit log keeps logging -E- part (response body) which makes the audit log too big. What can I do to disable ...
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59 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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55 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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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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224 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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144 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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145 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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133 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: ...