OWASP ModSecurity Core Rule Set up to 3.0.x/3.1.x/3.2.0/3.2.1 HTTP Header Content-Type authorization

Summaryinfo

A vulnerability classified as critical has been found in OWASP ModSecurity Core Rule Set up to 3.0.x/3.1.x/3.2.0/3.2.1. Affected is an unknown function of the component HTTP Header Handler. This manipulation of the argument Content-Type causes authorization. This vulnerability is handled as CVE-2022-39955. The attack can be initiated remotely. There is not any exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in OWASP ModSecurity Core Rule Set up to 3.0.x/3.1.x/3.2.0/3.2.1. It has been declared as critical. Affected by this vulnerability is some unknown processing of the component HTTP Header Handler. The manipulation of the argument Content-Type with an unknown input leads to a authorization vulnerability. The CWE definition for the vulnerability is CWE-863. The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The weakness was released 09/20/2022. It is possible to read the advisory at coreruleset.org. This vulnerability is known as CVE-2022-39955 since 09/05/2022. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 3.3.1 or 3.3.2 eliminates this vulnerability.

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Productinfo

Vendor

• OWASP

Name

• ModSecurity Core Rule Set

Version

• 3.0
• 3.1
• 3.2.0
• 3.2.1

License

• open-source

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CPE 2.2info

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