CVE-2022-39956

Summary

The OWASP ModSecurity Core Rule Set (CRS) is affected by a partial rule set bypass for HTTP multipart requests by submitting a payload that uses a character encoding scheme via the Content-Type or the deprecated Content-Transfer-Encoding multipart MIME header fields that will not be decoded and inspected by the web application firewall engine and the rule set. The multipart payload will therefore bypass detection. A vulnerable backend that supports these encoding schemes can potentially be exploited. 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 upgrade to 3.2.2 and 3.3.3 respectively. The mitigation against these vulnerabilities depends on the installation of the latest ModSecurity version (v2.9.6 / v3.0.8).

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-863: CWE-863 Incorrect Authorization

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

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

References