Using a volume we can replace this file with the desired configuration. For example, the modsecuritycrs35badrobots.conf in the baserules directory references the modsecurity35badrobots.data file that contains a list of User-Agents that you would like to block. There is also a modsecurityiis.conf file in the core rules set that you can use to setup all the CRS rules for your site.The answer is to use ModSecurity's ability to count how many variables there. Most of the examples in this tutorial, so far, haven't used any actions. NGINX Configuration NGINX ConfigurationThe high-level workflow of continuous monitoring and alerting system using ModSecurity and ELK can be described as follows: Implement ModSecurity WAF. Analyze ModSecurity WAF logs for any OWASP (Open Web Application Security Project) top 10 Risk.Custom DH parameters for perfect forward secrecyThe ModSecurity rule sets can be customized to shield applications from common. Removing the unsupported action ver can cause Oracle Traffic Director to.ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx that is developed by Trustwave's SpiderLabs. It has a robust event-based programming language which provides protection from a range of attacks against web applications and allows for HTTP traffic monitoring, logging and real-time analysis - The ModSecurity-nginx connector is the connection point between NGINX and libmodsecurity (ModSecurity v3).The default ModSecurity configuration file is located in /etc/nginx/modsecurity/modsecurity.conf.Due to the value of the setting SecAuditLogType=Concurrent the ModSecurity log is stored in multiple files inside the directory /var/log/audit. The default Serial value in SecAuditLogType can impact performance.The OWASP ModSecurity Core Rule Set (CRS) is a set of generic attack detection rules for use with ModSecurity or compatible web application firewalls. The CRS aims to protect web applications from a wide range of attacks, including the OWASP Top Ten, with a minimum of false alerts. The directory /etc/nginx/owasp-modsecurity-crs contains the OWASP ModSecurity Core Rule Set repository.
Modsecurity Action Full List OfThe full list of operators is available here:There are a number of transformation functions that can be performed, for example:Anti-evasion (such as lowercase, normalisePath, removeNulls, replaceComments, compressWhitespace)Decoding (such as base64Decode, hexDecode, jsDecode, urlDecodeUni)Encoding (such as base64Encode, hexEncode)This specifies what to do if the rule matches. Operators begin with the character. The full list of variables is available here: OperatorThis specifies a regular expression, pattern or keyword to be checked in the variable(s). Examples of variables include:ARGS – all arguments including the POST payloadREQUEST_METHOD – request method used in the transactionREQUEST_HEADERS – can be used as either a collection of all of the request headers or can be used to inspect selected headersEtc. 5.2 Rule Example 2 – Whitelist IP AddressThis specifies which places to check in a HTTP transaction. Iti rigging trainingXSS Attack) assigned to the rule (or chain) in which it appears.The severity of the rule. For example, the following rule:Rule Example 1 – Cross Site Scripting (XSS) AttackThe following rule is used to avoid XSS attacks by checking for a pattern in the request parameters and header and generates an ‘XSS Attack’ message with a 404 status response.SecRule ARGS|REQUEST_HEADERS ” id:101,msg: ‘XSS Attack’,severity:ERROR,deny,status:404Details about the variables in this rule example are in the table below:All of the request ” – Performs a regular expression match of the pattern (in this case ) provided as a parameter.Details of the actions contained in this rule example are provided in the table below:These are all of the actions to be performed if the pattern is matched.The unique ID that is assigned to the rule (or chain) in which it appears.The custom message (i.e. The double quotes are used because the second parameter contains a space:To split a long line into two, use a single backslash character, followed by a new line:Multiple variables can be used in a rule as long as they are separated using the pipe character, for example:The SecDefaultAction directive is used if no actions are defined for a rule. Specifying the correct phase can be beneficial in order to reduce CPU processing.The following rule looks at the request Uniform Resource Identifier (URI) and tries to match the regular expression pattern against it. The full list of actions are available here:When constructing the rules, you can specify at what phase the rule should run. ![]() ![]() Details of both rules are provided in the sections below. There are two rules needed in this case. If the first rule holds true, the second rule is activated which denies all requests that are not from the REMOTE_ADDR 192.168.1.111 IP Address (!streq 192.168.1.111).SecRule REMOTE_ADDR “!streq 192.168.1.111”2.5.4Rule Example 4 – Shellshock Bash AttackThis section shows an example of the rules requires to mitigate the Shellshock Bash attack. In this example, the first rule checks if the username (ARGS:username) for the string admin (streq admin) using a string comparison.
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