CVE-2020-8558

Public Exploit
Kubernetes node setting allows for neighboring hosts to bypass localhost boundary

Description

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.

Category

5.4
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 25.12% Top 5%
Third-Party Advisory github.com Third-Party Advisory google.com Third-Party Advisory netapp.com
Affected: Kubernetes Kubernetes
Published at:
Updated at:

References

Link Tags
https://github.com/kubernetes/kubernetes/issues/92315 patch mitigation exploit third party advisory
https://groups.google.com/g/kubernetes-announce/c/sI4KmlH3S2I/m/TljjxOBvBQAJ mailing list mitigation exploit third party advisory
https://security.netapp.com/advisory/ntap-20200821-0001/ third party advisory

Frequently Asked Questions

What is the severity of CVE-2020-8558?
CVE-2020-8558 has been scored as a medium severity vulnerability.
How to fix CVE-2020-8558?
To fix CVE-2020-8558, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2020-8558 being actively exploited in the wild?
It is possible that CVE-2020-8558 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~25% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2020-8558?
CVE-2020-8558 affects Kubernetes Kubernetes.
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