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Werk #7174: Apache: Disable TRACE and OPTIONS methods

TitleApache: Disable TRACE and OPTIONS methods
Date2019-02-20 07:43:31
Checkmk EditionCheckmk Raw Edition (CRE)
Checkmk Version1.6.0b1
LevelTrivial Change
ClassSecurity Fix
CompatibilityCompatible - no manual interaction needed

The HTTP method TRACE makes some kind of reflection attacks possible and is not used at all. It has been enabled for the site apache using the option TraceEnable Off in etc/apache/conf.d/security.conf.

The similar TRACK method is not supported by the site apache at all, so it does not have to be disabled.

A lot of guides recommend to also disable the OPTIONS method for production servers. This HTTP method basically reports which HTTP Methods that are allowed on the web server. In reality, this is rarely used for legitimate purposes, but it may grant a potential attacker a little bit of help and it can be considered a shortcut to find another hole. For this reason we also disabled the OPTIONS method.