Difference between revisions of "OWASP ModSec CRS Paranoia Mode"

Revision as of 21:25, 14 February 2016

Abstract

This is a page about the development of a paranoia mode aka bringing back the rules that used to yield a high number of false positives. This little project is aimed at inclusion into the 3.0.0 release of the OWASP ModSecurity Core Rules, where some rules have been removed in order to reduce the number of false positives with vanilla installations.

FIXME: Detailed description

Back to the OWASP ModSecurity Core Rules Set.

Sub-Project Infos

• Status: active (January 2016)
• Schedule: Pull request in JanuaryFebruary 2016
• Who: Christian Folini (dune73), Noël Zindel (zino), Franziska Bühler (franziskabuehler), Manuel Leos (Spartan), Walter Hop (lifeforms)
• Documentation: Here on the OWASP Wiki / Mechanics Proposal
• Discussion / Archive: [email protected] / archive: http://lists.owasp.org/pipermail/owasp-modsecurity-core-rule-set/
• Github Link v3.0.0-rc1 (our base): https://github.com/SpiderLabs/owasp-modsecurity-crs/tree/v3.0.0-rc1
• Github Link paranoia-mode: https://github.com/dune73/owasp-modsecurity-crs/tree/paranoia-mode
• Final Pull Request #1: Add paranoia mode mechanics: FIXME
• Final Pull Request #2 - Move first rules to paranoia mode: FIXME
• Final Pull Request #3 - Add 2.2.X rules to paranoia mode: FIXME
• Final Pull Request #4 - Add stricter siblings: FIXME

Tasks

Open Tasks

Please define state as follows: new, assigned, waiting, closed. When a task it is closed, it is moved to the seperate closed tasks table below.

Closed Tasks

Rules

Paranoia Mode Candidates

The 3.0.0-rc1 has all rules renumbered. Existing numbering was fairly crazy and the new numbering follows the numbering scheme of the rules files (-> 9<2-digit-rulefile><3-digit-id>) A mapping table exists [IdNumbering.csv] We need to make sure, we do not mess things up, so let's add both IDs to the table, the old one and the new one.

Please set status as follows : confirmed,candidate, cloning-confirmed,cloning-candidate, unsure, dropped.

• 'cloning-confirmed', 'cloning-candidates' are rules, that could be cloned into an even stricter variant with a stricter limit in a higher paranoia setting.
• If dropped, please provide reasoning in the remarks.

Rules from 2.2.X, missing in 3.0.0-rc1

It looks as if only the base_rules made it into 3.0.0. In fact there are a few rule ids know from the optional and experimental rule folders in 2.2.X, but it is more likely, these are new 3.0.0 rules reusing old rule ids as the rules (regexes and msg) do not match at all.

When trying to generate the list below, be aware that the rule ids have been renumbered between 3.0.0-dev and 3.0.0-rc1. IdNumbering.csv in your friend.

Base rules

Optional, experimental, slr rules

Stricter siblings for existing rules

Stricter Siblings are rules that are present in the CRS but could be accompanied by a stricter clone in Paranoia Mode. Adjustments can differ from rule to rule but include higher anomaly ratings or stricter triggers (e.g. regex counters). To prevent masses of false positives, rules can come with additional filters (chained rules) for common use-cases. These can either be included into Paranoia Mode or simply serve as a recommendation.

Note: To avoid a cluttered project main-page, rule proposals are documented in their respective sub-page. When adding new proposals, make sure adding the rules original (2.2.x) ID, a quick description of what changes were made, and, if applicable, which additional filters were added.

Possible siblings:

981049 : Potential Denial of Service (DoS)
981172 : SQL Injection Character Anomaly Usage
981173 : SQL Injection Character Anomaly Usage

Project Status

Project Status January 30, 2016

Hello everybody,

It's time to do a status report of our little core rules project.

I am including Franziska Bühler and Walter Hop in this status mail. Both are experienced ModSec sysadmins. Franziska contributed to this first stage, Walter told me he does not have much time, but he was interested in participating at least in the discussions about the rules.

All in all, this is taking more time than anticipated. But we have also done things very throughly than I thought. Which is generally a good thing.

Done so far: