As mitigations to a report from 2019 and CVE-2020-8555, Kubernetes attempts to prevent proxied connections from accessing link-local or localhost networks when making user-driven connections to Services, Pods, Nodes, or StorageClass service providers. As part of this mitigation Kubernetes does a DNS name resolution check and validates that response IPs are not in the link-local (169.254.0.0/16) or localhost (127.0.0.0/8) range. Kubernetes then performs a second DNS resolution without validation for the actual connection. If a non-standard DNS server returns different non-cached responses, a user may be able to bypass the proxy IP restriction and access private networks on the control plane.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - As mitigations to a report from 2019 and CVE-2020-8555, Kubernetes attempts to prevent proxied connections     from accessing link-local or localhost networks when making user-driven connections to Services, Pods,     Nodes, or StorageClass service providers. As part of this mitigation Kubernetes does a DNS name resolution     check and validates that response IPs are not in the link-local (169.254.0.0/16) or localhost     (127.0.0.0/8) range. Kubernetes then performs a second DNS resolution without validation for the actual     connection. If a non-standard DNS server returns different non-cached responses, a user may be able to     bypass the proxy IP restriction and access private networks on the control plane. (CVE-2020-8562)

Note that Nessus relies on the presence of the package as reported by the vendor.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - As mitigations to a report from 2019 and CVE-2020-8555, Kubernetes attempts to prevent proxied connections
    from accessing link-local or localhost networks when making user-driven connections to Services, Pods,
    Nodes, or StorageClass service providers. As part of this mitigation Kubernetes does a DNS name resolution
    check and validates that response IPs are not in the link-local (169.254.0.0/16) or localhost
    (127.0.0.0/8) range. Kubernetes then performs a second DNS resolution without validation for the actual
    connection. If a non-standard DNS server returns different non-cached responses, a user may be able to
    bypass the proxy IP restriction and access private networks on the control plane. (CVE-2020-8562)

ID	Name	Product	Family	Severity
256688	Linux Distros Unpatched Vulnerability : CVE-2020-8562	Nessus	Misc.	low
418134	SCA: security update for k8s.io/kubernetes (GHSA-qh36-44jv-c8xj)	Tenable Cloud Security	SCA Checks	low
418134	SCA: security update for k8s.io/kubernetes (GHSA-qh36-44jv-c8xj)	Tenable Self-Hosted Container Security	SCA Checks	low

Detections

Analytics

CVE-2020-8562

low

Tenable Plugins

low

low

low