Skip to content
CVE PROGRAM SOURCE RECORD7.3 High

CVE-2022-39955

Partial rule set bypass in OWASP ModSecurity Core Rule Set by submitting a specially crafted HTTP Content-Type header

Read JSON ↗CVE.org ↗
Status
Published
Published
Updated
Assigning organization
NCSC.ch

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

OWASP ModSecurity Core Rule Set

  • 3.0.xaffected
  • 3.1.xaffected
  • unspecified to ≤ 3.2.1affected
  • unspecified to ≤ 3.3.2affected

References