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[email protected]CVE-2022-39955

HistorySep 20, 2022 - 7:15 a.m.

CVE-2022-39955

2022-09-2007:15:12

CWE-863

[email protected]

web.nvd.nist.gov

owasp

modsecurity

crs

cve-2022-39955

security

vulnerability

bypass

http

content-type

charset

encoding

backend

exploit

upgrade

9.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

9 High

AI Score

Confidence

High

0.013 Low

EPSS

Percentile

85.6%

JSON

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 configurations

NVD

Node

owaspowasp_modsecurity_core_rule_setRange3.0.0–3.2.2

owaspowasp_modsecurity_core_rule_setRange3.3.0–3.3.3

Node

fedoraprojectfedoraMatch35

fedoraprojectfedoraMatch36

fedoraprojectfedoraMatch37

Node

debiandebian_linuxMatch10.0

CPENameOperatorVersion
owasp:owasp_modsecurity_core_rule_setowasp owasp modsecurity core rule setlt3.2.2
owasp:owasp_modsecurity_core_rule_setowasp owasp modsecurity core rule setlt3.3.3

CPE	Name	Operator	Version
owasp:owasp_modsecurity_core_rule_set	owasp owasp modsecurity core rule set	lt	3.2.2
owasp:owasp_modsecurity_core_rule_set	owasp owasp modsecurity core rule set	lt	3.3.3

CNA Affected

[
  {
    "vendor": "OWASP",
    "product": "ModSecurity Core Rule Set",
    "versions": [
      {
        "version": "3.0.x",
        "status": "affected"
      },
      {
        "version": "3.1.x",
        "status": "affected"
      },
      {
        "version": "unspecified",
        "lessThanOrEqual": "3.2.1",
        "status": "affected",
        "versionType": "custom"
      },
      {
        "version": "unspecified",
        "lessThanOrEqual": "3.3.2",
        "status": "affected",
        "versionType": "custom"
      }
    ]
  }
]