== OWASP ModSecurity Core Rule Set (CRS) KNOWN BUGS ==
== Report Bugs/Issues to GitHub Issues Tracker or the mailinglist ==
or the CRS mailinglist at
* There are still false positives for standard web applications in
the default install (paranoia level 1). Please report these when
you encounter them.
False Positives from paranoia level 2 rules are less interesting,
as we expect users to write exclusion rules for their alerts in
the higher paranoia levels.
* Permanent blocking of clients is based on a previous user agent / IP
combination. Changing the user agent will thus allow to bypass
this new filter. The plan is to allow for a purely IP based
filter in the future.
* Apache 2.4 prior to 2.4.11 is affected by a bug in parsing multi-line
configuration directives, which causes Apache to fail during startup
with an error such as:
Error parsing actions: Unknown action: \\
Action 'configtest' failed.
This bug is known to plague RHEL 7 and Ubuntu 14.04 LTS users.
We advise to upgrade your Apache version. If upgrading is not possible,
we have provided a script in the util/join-multiline-rules directory
which converts the rules into a format that works around the bug.
You have to re-run this script whenever you modify or update
the CRS rules.
* Debian up to and including Jessie lacks YAJL/JSON support in ModSecurity,
which causes the following error in the Apache ErrorLog or SecAuditLog:
'ModSecurity: JSON support was not enabled.'
JSON support was enabled in Debian's package version 2.8.0-4 (Nov 2014).
You can either use backports.debian.org to install the latest ModSecurity
release or disable rule id 200001.
* As of CRS version 3.0.1, support has been added for the application/soap+xml MIME
type by default, as specified in RFC 3902. OF IMPORTANCE, application/soap+xml is
indicative that XML will be provided. In accordance with this, ModSecurity's XML
Request Body Processor should also be configured to support this MIME type. Within
the ModSecurity project, commit 5e4e2af
has been merged to support this endevour. However, if you are running a modified or
preexisting version of the modsecurity.conf provided by this repository, you may
wish to upgrade rule '200000' accordingly. The rule now appears as follows:
SecRule REQUEST_HEADERS:Content-Type "(?:application(?:/soap\+|/)|text/)xml" \