QID 377835

Date Published: 2023-01-04

QID 377835: Bypass of Kubernetes API Server Proxy Vulnerability

Kubernetes is an open-source container-orchestration system for automating deployment, scaling, and management of containerized applications.

Affected version:
Kubernetes 1.21.0
Kubernetes 1.20.x up to and including v1.20.6
Kubernetes 1.19 up to and including v1.19.10
Kubernetes all version prior to and including v1.18.18
QID Detection Logic:(Authenticated)
The QID uses 'kubectl version' command to check for vulnerable versions of Kubernetes

Successful exploitation of the vulnerability may allow an attacker to an untrusted user can create or modify Node objects and proxy to them, or an untrusted user can create or modify StorageClass objects and access KubeControllerManager logs.

CVSS V3 rated as Medium - 3.1 severity.

CVSS V2 rated as Medium - 3.5 severity.

Solution

For more information please visit 91542

Workaround:
If this issue affects your clusters control planes, you can use dnsmasq for name resolution and configure the min-cache-ttl and neg-ttl parameters to a low non-zero value to enforce cached replies for proxied connections.

Vendor References

101493 - github.com/kubernetes/kubernetes/issues/101493

CVEs related to QID 377835

CVE-2020-8562 |

Software Advisories

Advisory ID	Software	Component	Link

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