// For flags

CVE-2020-8558

Kubernetes node setting allows for neighboring hosts to bypass localhost boundary

Severity Score

8.8
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

2
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

The Kubelet and kube-proxy components in versions 1.1.0-1.16.10, 1.17.0-1.17.6, and 1.18.0-1.18.3 were found to contain a security issue which allows adjacent hosts to reach TCP and UDP services bound to 127.0.0.1 running on the node or in the node's network namespace. Such a service is generally thought to be reachable only by other processes on the same host, but due to this defeect, could be reachable by other hosts on the same LAN as the node, or by containers running on the same node as the service.

Se encontró que los componentes Kubelet y kube-proxy en las versiones 1.1.0-1.16.10, 1.17.0-1.17.6 y 1.18.0-1.18.3, contienen un problema de seguridad que permite a los hosts adyacentes alcanzar los servicios TCP y UDP vinculados a la versión 127.0.0.1, que se ejecutan en el nodo o en el espacio de nombres de red del nodo. Dicho servicio se considera generalmente que puede ser alcanzado solo por otros procesos en el mismo host, pero debido a esta defensa, podrían ser alcanzados por otros hosts en la misma LAN que el nodo o por contenedores que se ejecutan en el mismo nodo que el servicio

A flaw was found in Kubernetes that allows attackers on adjacent networks to reach services exposed on localhost ports, previously thought to be unreachable. This flaw allows an attacker to gain privileges or access confidential information for any services listening on localhost ports that are not protected by authentication.

*Credits: János Kövér, Ericsson, Additional impacts reported by Rory McCune, NCC Group and Yuval Avrahami and Ariel Zelivansky, Palo Alto Networks
CVSS Scores
Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None
Attack Vector
Adjacent
Attack Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2020-02-03 CVE Reserved
  • 2020-07-13 CVE Published
  • 2023-11-30 EPSS Updated
  • 2024-09-16 CVE Updated
  • 2024-09-16 First Exploit
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
CWE
  • CWE-300: Channel Accessible by Non-Endpoint
  • CWE-420: Unprotected Alternate Channel
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Kubernetes
Search vendor "Kubernetes"
 Kubernetes
Search vendor "Kubernetes" for product "Kubernetes"
 >= 1.1.0 <= 1.16.10
Search vendor "Kubernetes" for product "Kubernetes" and version " >= 1.1.0 <= 1.16.10"
-
Affected
Kubernetes
Search vendor "Kubernetes"
 Kubernetes
Search vendor "Kubernetes" for product "Kubernetes"
 >= 1.17.0 <= 1.17.6
Search vendor "Kubernetes" for product "Kubernetes" and version " >= 1.17.0 <= 1.17.6"
-
Affected
Kubernetes
Search vendor "Kubernetes"
 Kubernetes
Search vendor "Kubernetes" for product "Kubernetes"
 >= 1.18.0 <= 1.18.3
Search vendor "Kubernetes" for product "Kubernetes" and version " >= 1.18.0 <= 1.18.3"
-
Affected