Incorrect Authorization Affecting mod_security_crs package, versions *


Severity

Recommended
medium

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.13% (35th percentile)

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  • Snyk IDSNYK-RHEL8-MODSECURITYCRS-3038080
  • published1 Oct 2022
  • disclosed19 Sept 2022

Introduced: 19 Sep 2022

CVE-2022-39955  (opens in a new tab)
CWE-863  (opens in a new tab)

How to fix?

There is no fixed version for RHEL:8 mod_security_crs.

NVD Description

Note: Versions mentioned in the description apply only to the upstream mod_security_crs package and not the mod_security_crs package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

The OWASP ModSecurity Core Rule Set (CRS) is affected by a partial rule set bypass by submitting a specially crafted HTTP Content-Type header field that indicates multiple character encoding schemes. A vulnerable back-end can potentially be exploited by declaring multiple Content-Type "charset" names and therefore bypassing the configurable CRS Content-Type header "charset" allow list. An encoded payload can bypass CRS detection this way and may then be decoded by the backend. The legacy CRS versions 3.0.x and 3.1.x are affected, as well as the currently supported versions 3.2.1 and 3.3.2. Integrators and users are advised to upgrade to 3.2.2 and 3.3.3 respectively.

CVSS Base Scores

version 3.1