CVE-2020-8559: Privilege escalation from compromised node to cluster
First published: Fri Jun 26 2020(Updated: )
A flaw was found in the Kubernetes API server, where it allows an attacker to escalate their privileges from a compromised node. This flaw allows an attacker who can intercept requests on a compromised node, to redirect those requests, along with their credentials, to perform actions on other endpoints that trust those credentials (including other clusters), allowing for escalation of privileges. The highest threat from this vulnerability is to confidentiality, integrity, and system availability.
Credit: jordan@liggitt.net jordan@liggitt.net
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/atomic-openshift | <0:3.11.346-1.git.0.ea10721.el7 | 0:3.11.346-1.git.0.ea10721.el7 |
| redhat/openshift | <0:4.4.0-202012052258.p0.git.0.0fd57a4.el7 | 0:4.4.0-202012052258.p0.git.0.0fd57a4.el7 |
| redhat/openshift | <0:4.6.0-202010022112.p0.git.94033.ef41184.el7 | 0:4.6.0-202010022112.p0.git.94033.ef41184.el7 |
| Kubernetes Kubernetes | >=1.6.0<=1.15.0 | |
| Kubernetes Kubernetes | >=1.16.0<1.16.13 | |
| Kubernetes Kubernetes | >=1.17.0<1.17.9 | |
| Kubernetes Kubernetes | >=1.18.0<1.18.6 | |
| redhat/kubernetes | <1.18.6 | 1.18.6 |
| redhat/kubernetes | <1.17.9 | 1.17.9 |
| redhat/kubernetes | <1.16.13 | 1.16.13 |
| go/k8s.io/kubernetes | >=1.18.0<1.18.7 | 1.18.7 |
| go/k8s.io/kubernetes | >=1.17.0<1.17.9 | 1.17.9 |
| go/k8s.io/kubernetes | <1.16.13 | 1.16.13 |
| go/k8s.io/apimachinery | >=0.18.0<0.18.7 | 0.18.7 |
| go/k8s.io/apimachinery | >=0.17.0<0.17.9 | 0.17.9 |
| go/k8s.io/apimachinery | <0.16.13 | 0.16.13 |
Remedy
No mitigation is known.
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Reference Links
- https://www.cve.org/CVERecord?id=CVE-2020-8559 https://nvd.nist.gov/vuln/detail/CVE-2020-8559 https://groups.google.com/g/kubernetes-security-announce/c/JAIGG5yNROs
- https://bugzilla.redhat.com/show_bug.cgi?id=1851422
- https://access.redhat.com/errata/RHSA-2020:5363
- https://access.redhat.com/errata/RHSA-2021:0030
- https://access.redhat.com/errata/RHSA-2021:0281
- https://access.redhat.com/errata/RHSA-2020:5194
- https://access.redhat.com/errata/RHBA-2020:4197
- https://access.redhat.com/errata/RHSA-2020:4298
- https://access.redhat.com/security/cve/cve-2020-8559
- https://github.com/kubernetes/kubernetes/issues/92914
- https://groups.google.com/d/msg/kubernetes-security-announce/JAIGG5yNROs/19nHQ5wkBwAJ
- https://security.netapp.com/advisory/ntap-20200810-0004/
- https://github.com/kubernetes/kubernetes/pull/92941
- https://groups.google.com/g/kubernetes-security-announce/c/JAIGG5yNROs
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1857458
- https://nvd.nist.gov/vuln/detail/CVE-2020-8559
- https://github.com/tdwyer/CVE-2020-8559
- https://security.netapp.com/advisory/ntap-20200810-0004
- https://github.com/advisories/GHSA-33c5-9fx5-fvjm (Advisory)
Parent vulnerabilities
(Appears in the following advisories)
Frequently Asked Questions
What is CVE-2020-8559?
CVE-2020-8559 is a vulnerability in the Kubernetes API server that allows an attacker to escalate their privileges from a compromised node.
What is the severity of CVE-2020-8559?
The severity of CVE-2020-8559 is medium with a CVSS score of 6.4.
Which versions of Kubernetes are affected by CVE-2020-8559?
Versions v1.6-v1.15 and versions prior to v1.16.13, v1.17.9, and v1.18.6 are affected by CVE-2020-8559.
How can I fix CVE-2020-8559?
To fix CVE-2020-8559, update your Kubernetes installation to version v1.16.13, v1.17.9, or v1.18.6.
Where can I find more information about CVE-2020-8559?
You can find more information about CVE-2020-8559 on the CVE website, NIST NVD, Kubernetes Security Announcements, Red Hat Bugzilla, and Red Hat Errata.
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