We recommend to start over by copying our to nf with a copy of your old file at hand, and re-do the customizations that you had under CRS 3. Most rules have only evolved slightly, so it is recommended that you keep any existing custom exclusions that you have made under CRS 3. In terms of changes to the detection rules, the amount of changes is smaller than in the CRS 2-3 changeover. You can find detailed information on working with plugins in our plugins documentation. We maintain the list of plugins in our Plugin Registry. If you had activated the exclusion packages in CRS 3, you should download the plugins for them and place them in the plugins subdirectory. The most impactful change is the removal of application exclusion packages in favor of a plugin system. This paranoia level however will bring you a higher protection level than CRS 2.x or a CRS 3 default install, so it can be worth the investment. This is a stricter mode, which blocks additional attack patterns, but brings a higher number of false positives - in many situations the false positives will be comparable with CRS 2.x. If you are experienced in writing exclusion rules for CRS 2.x, it may be worthwhile to try running CRS 3 in Paranoia Level 2 (PL2). Therefore, it is a good option to start fresh without your old exclusion rules. However, a key feature of the CRS 3 is the reduction of false positives in the default installation, and many of your old exclusion rules may no longer be necessary. You can do this using the supplied utility util/id_renumbering/update.py or find the changes in util/id_renumbering/IdNumbering.csv. SecRuleRemoveById, SecRuleRemoveTargetById, ctl:ruleRemoveById or ctl:ruleRemoveTargetById) you must renumber the rule numbers in that configuration. This means that if you have written custom configuration with exclusion rules (e.g. Most rule IDs have been changed to reorganize them into logical sections. We recommend you to start with a fresh nf file from scratch. Your former modsecurity_crs_10_nf file is thus no longer usable. However, CRS 3.0 is a major rewrite, incompatible with CRS 2.x. Key setup variables have changed their name, and new features have been introduced. In general, you can update by unzipping our new release over your older one, and updating the nf file with any new settings. But sooner or later, you may encounter false positives nevertheless.Ĭhristian Folini's tutorials on installing ModSecurity, configuring the CRS and handling false positives provide in-depth information on these topics. We are trying hard to reduce the number of false positives (false alerts) in the default installation. The nf file is generally a very good entry point to explore the features of the CRS. Handling False Positives and Advanced FeaturesĪdvanced features are explained in the nf and the rule files themselves. Also review the CHANGES and KNOWN_BUGS documents. Then include the files in your webserver configuration (inserting your correct path): Include /./nfįor detailed installation instructions, see the INSTALL document and/or the full installation documentation. Optionally edit this file to configure your CRS settings. Git clone more files and GPG signatures at our GitHub release page. Use Git if you want to test or collaborate on our development branch 4.0: GitHub If you want to help test or preview the latest improvements, download the release candidate 4.0.0-RC1: zip Our next release is in the process of being tested. Our release archives are the preferred way to download the release version 3.3.2: zip IIS/Nginx web server with ModSecurity 3.0.3 or higher.Apache web server with ModSecurity 2.9.x.CRS 3 requires a web server with ModSecurity.
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