// For flags

CVE-2022-39956

Partial rule set bypass in OWASP ModSecurity Core Rule Set for HTTP multipart requests using character encoding in the Content-Type or Content-Transfer-Encoding header

Severity Score

9.8
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

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).

OWASP ModSecurity Core Rule Set (CRS) está afectado por una omisión parcial del conjunto de reglas para peticiones HTTP multiparte al enviar una carga útil que usa un esquema de codificación de caracteres por medio del Content-Type o los campos de cabecera MIME multiparte obsoletos que no serán decodificados e inspeccionados por el motor del firewall de aplicaciones web y el conjunto de reglas. Por lo tanto, la carga útil multiparte omitirá la detección. Un backend vulnerable que soporte estos esquemas de codificación puede ser potencialmente explotado. Las versiones heredadas de CRS 3.0.x y 3.1.x están afectadas, así como las versiones 3.2.1 y 3.3.2 actualmente soportadas. Es recomendado a integradores y usuarios actualizar a las versiones 3.2.2 y 3.3.3 respectivamente. La mitigación contra estas vulnerabilidades depende de la instalación de la última versión de ModSecurity (versiones v2.9.6 / v3.0.8)

*Credits: @terjanq (Jan Gora)
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2022-09-05 CVE Reserved
  • 2022-09-20 CVE Published
  • 2024-05-11 EPSS Updated
  • 2024-08-03 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-116: Improper Encoding or Escaping of Output
  • CWE-863: Incorrect Authorization
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Owasp
Search vendor "Owasp"
 Owasp Modsecurity Core Rule Set
Search vendor "Owasp" for product "Owasp Modsecurity Core Rule Set"
 >= 3.0.0 < 3.2.2
Search vendor "Owasp" for product "Owasp Modsecurity Core Rule Set" and version " >= 3.0.0 < 3.2.2"
-
Affected
Owasp
Search vendor "Owasp"
 Owasp Modsecurity Core Rule Set
Search vendor "Owasp" for product "Owasp Modsecurity Core Rule Set"
 >= 3.3.0 < 3.3.3
Search vendor "Owasp" for product "Owasp Modsecurity Core Rule Set" and version " >= 3.3.0 < 3.3.3"
-
Affected
Fedoraproject
Search vendor "Fedoraproject"
 Fedora
Search vendor "Fedoraproject" for product "Fedora"
 35
Search vendor "Fedoraproject" for product "Fedora" and version "35"
-
Affected
Fedoraproject
Search vendor "Fedoraproject"
 Fedora
Search vendor "Fedoraproject" for product "Fedora"
 36
Search vendor "Fedoraproject" for product "Fedora" and version "36"
-
Affected
Fedoraproject
Search vendor "Fedoraproject"
 Fedora
Search vendor "Fedoraproject" for product "Fedora"
 37
Search vendor "Fedoraproject" for product "Fedora" and version "37"
-
Affected
Debian
Search vendor "Debian"
 Debian Linux
Search vendor "Debian" for product "Debian Linux"
 10.0
Search vendor "Debian" for product "Debian Linux" and version "10.0"
-
Affected