CVE-2022-39957

Summary

The OWASP ModSecurity Core Rule Set (CRS) is affected by a response body bypass. A client can issue an HTTP Accept header field containing an optional "charset" parameter in order to receive the response in an encoded form. Depending on the "charset", this response can not be decoded by the web application firewall. A restricted resource, access to which would ordinarily be detected, may therefore bypass detection. 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 Software

VendorProductVersion RangeStatus
OWASPModSecurity Core Rule Set3.0.xaffected
OWASPModSecurity Core Rule Set3.1.xaffected
OWASPModSecurity Core Rule Setunspecified <= 3.2.1affected
OWASPModSecurity Core Rule Setunspecified <= 3.3.2affected

Weaknesses

  • CWE-693: CWE-693: Protection Mechanism Failure

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: yes
    • Technical Impact: partial

References