CVE-2020-8551 Kubernetes kubelet denial of service
Attackers can cause a denial of service in Kubernetes kubelet via its API, affecting cluster availability.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-8551?
CVE-2020-8551 is a medium-severity denial of service vulnerability in Fedoraproject Fedora, published on 27 Mar 2020. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
The Kubelet component in versions 1.15.0-1.15.9, 1.16.0-1.16.6, and 1.17.0-1.17.2 has been found to be vulnerable to a denial of service attack via the kubelet API, including the unauthenticated HTTP read-only API typically served on port 10255, and the authenticated HTTPS API typically served on port 10250.
Which versions are affected by CVE-2020-8551?
7 open source packages ship an affected version, including k8s.io/kubernetes. It affects 2 products.
| Package | Affected | Fixed in |
|---|---|---|
k8s.io/kubernetes Go | From 1.15.0 | 1.15.10, 1.16.6, 1.17.2 |
k8s.io/kubernetes Go | From 1.15.0 | 1.15.10 |
k8s.io/kubernetes Go | From 1.15.0 | 1.15.10 |
k8s.io/kubernetes Go | From 1.16.0 | 1.16.6 |
k8s.io/kubernetes Go | From 1.16.0 | 1.16.6 |
k8s.io/kubernetes Go | From 1.17.0 | 1.17.2 |
1 more packages
k8s.io/kubernetes Go | From 1.17.0 | 1.17.2 |
Linux distribution packages (4)
openshift Red Hat:openshift:4.3::el7 | All versions | 0:4.3.10-202003300855.git.0.da48c1d.el7 |
openshift-hyperkube Red Hat:openshift:4.3::el7 | All versions | 0:4.3.10-202003300855.git.0.da48c1d.el7 |
openshift Red Hat:openshift:4.3::el8 | All versions | 0:4.3.10-202003300855.git.0.da48c1d.el8 |
openshift-hyperkube Red Hat:openshift:4.3::el8 | All versions | 0:4.3.10-202003300855.git.0.da48c1d.el8 |
Products include Fedoraproject Fedora, Kubernetes Kubernetes.
How do I fix CVE-2020-8551?
Upgrade k8s.io/kubernetes to a fixed version for your release line: 1.15.10, 1.16.6 or 1.17.2.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2020-8551 being exploited?
There is no known exploitation of CVE-2020-8551 in the wild and no public exploit code.
Other vulnerabilities in Fedoraproject Fedora
Sources
Also known as DEBIAN-CVE-2020-8551, GHSA-qhm4-jxv7-j9pq, GO-2022-0867, RHSA-2020:1276.