// For flags

CVE-2021-20238

 

Severity Score

3.7
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

It was found in OpenShift Container Platform 4 that ignition config, served by the Machine Config Server, can be accessed externally from clusters without authentication. The MCS endpoint (port 22623) provides ignition configuration used for bootstrapping Nodes and can include some sensitive data, e.g. registry pull secrets. There are two scenarios where this data can be accessed. The first is on Baremetal, OpenStack, Ovirt, Vsphere and KubeVirt deployments which do not have a separate internal API endpoint and allow access from outside the cluster to port 22623 from the standard OpenShift API Virtual IP address. The second is on cloud deployments when using unsupported network plugins, which do not create iptables rules that prevent to port 22623. In this scenario, the ignition config is exposed to all pods within the cluster and cannot be accessed externally.

Se ha encontrado en OpenShift Container Platform 4 que la configuración de encendido, servida por el Machine Config Server, puede ser accedida externamente desde los clusters sin autenticación. El endpoint del MCS (puerto 22623) proporciona la configuración de ignición usada para el arranque de los nodos y puede incluir algunos datos confidenciales, por ejemplo, secretos de extracción del registro. Se presentan dos escenarios en los que puede accederse a estos datos. El primero es en los despliegues de Baremetal, OpenStack, Ovirt, Vsphere y KubeVirt que no presentan un endpoint de API interno separado y permiten el acceso desde fuera del clúster al puerto 22623 desde la dirección IP virtual de la API estándar de OpenShift. La segunda es en los despliegues en la nube cuando son usados plugins de red no soportados, que no crean reglas iptables que impidan al puerto 22623. En este escenario, la configuración de encendido está expuesta a todos los pods dentro del clúster y no puede accederse externamente

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None
Attack Vector
Network
Attack Complexity
Medium
Authentication
None
Confidentiality
Partial
Integrity
None
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2020-12-17 CVE Reserved
  • 2022-04-01 CVE Published
  • 2023-10-23 EPSS Updated
  • 2024-08-03 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-287: Improper Authentication
  • CWE-306: Missing Authentication for Critical Function
CAPEC
References (1)
URL Tag Source
URL Date SRC
URL Date SRC
URL Date SRC
https://bugzilla.redhat.com/show_bug.cgi?id=1926568 2023-06-26
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Redhat
Search vendor "Redhat"
 Openshift Container Platform
Search vendor "Redhat" for product "Openshift Container Platform"
 4.0
Search vendor "Redhat" for product "Openshift Container Platform" and version "4.0"
-
Affected
Redhat
Search vendor "Redhat"
 Openshift Machine-config-operator
Search vendor "Redhat" for product "Openshift Machine-config-operator"
 <= 4.9.0
Search vendor "Redhat" for product "Openshift Machine-config-operator" and version " <= 4.9.0"
-
Affected