CRS 3.0/3.1/3.2.1/3.3.2 Response Body Bypass Upgrade to 3.2.2/3.3.3
CVE-2022-39958 Published on September 20, 2022
Response body bypass in OWASP ModSecurity Core Rule Set via repeated HTTP Range header submission with a small byte range
The OWASP ModSecurity Core Rule Set (CRS) is affected by a response body bypass to sequentially exfiltrate small and undetectable sections of data by repeatedly submitting an HTTP Range header field with a small byte range. A restricted resource, access to which would ordinarily be detected, may be exfiltrated from the backend, despite being protected by a web application firewall that uses CRS. Short subsections of a restricted resource may bypass pattern matching techniques and allow undetected access. 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 and to configure a CRS paranoia level of 3 or higher.
Vulnerability Analysis
CVE-2022-39958 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality, with no impact on integrity and availability.
Weakness Type
What is an AuthZ Vulnerability?
The software 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.
CVE-2022-39958 has been classified to as an AuthZ vulnerability or weakness.
Products Associated with CVE-2022-39958
You can be notified by email with stack.watch whenever vulnerabilities like CVE-2022-39958 are published in these products:
Affected Versions
OWASP ModSecurity Core Rule Set:- Version 3.0.x is affected.
- Version 3.1.x is affected.
- Version unspecified, <= 3.2.1 is affected.
- Version unspecified, <= 3.3.2 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.