Kubelet component in versions 1.15.0-1.15.9

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Kunyang Overview :

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.

CVE-2020-8551

wo security issues were discovered in Kubernetes that could lead to a recoverable denial of service.

CVE-2020-8551 affects the kubelet, and has been rated Medium (CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L).

CVE-2020-8552 affects the API server, and has also been rated Medium (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L).

Am I vulnerable?

If an attacker can make an authorized resource request to an unpatched API server (see below), then you may be vulnerable to CVE-2020-8552. If an attacker can make an authorized request to an unpatched kubelet, then you may be vulnerable to CVE-2020-8551.

Affected Versions

CVE-2020-8551 affects:

kubelet v1.17.0 – v1.17.2
kubelet v1.16.0 – v1.16.6
kubelet v1.15.0 – v1.15.10\
kubelets prior to v1.15.0 are unaffected

CVE-2020-8552 affects:

kube-apiserver v1.17.0 – v1.17.2
kube-apiserver v1.16.0 – v1.16.6
kube-apiserver < v1.15.10

How do I mitigate this vulnerability?

Prior to upgrading, these vulnerabilities can be mitigated by:

Preventing unauthenticated or unauthorized access to the affected components
The apiserver and kubelet should auto restart in the event of an OOM error

Fixed Versions

Both vulnerabilities are patched in kubernetes versions

v1.17.3
v1.16.7
v1.15.10

To upgrade, refer to the documentation: https://kubernetes.io/docs/tasks/administer-cluster/cluster-management/#upgrading-a-cluster

Additional Details

See the GitHub issues for more details:

CVE-2020-8551: https://github.com/kubernetes/kubernetes/issues/89377
CVE-2020-8552: https://github.com/kubernetes/kubernetes/issues/89378

Três Coroas References

MISC:https://github.com/kubernetes/kubernetes/issues/89377 MISC:https://groups.google.com/forum/#!topic/kubernetes-security-announce/2UOlsba2g0s

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