# CVE-2020-8562: kubernetes: As mitigations to a report from 2019 and CVE-2020-8555, Kubernetes attempts to prevent proxied connections from acces...

CVE-2020-8562 is fixed in kubernetes on 1 platform, first by DEBIAN-CVE-2020-8562, released February 1, 2022. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2020-8562
- Priority: Routine
- CVSS: 3.1 (low)
- EPSS: 0.0119
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 1, 2022

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | kubernetes Debian 12.15 (bookworm) | 1.20.5+really1.20.2-1 | [DEBIAN-CVE-2020-8562](https://patchblox.com/security/data/fix/linux/debian-cve-2020-8562.md) | Feb 1, 2022 |
| Linux | kubernetes Debian 13.5 (trixie) | 1.20.5+really1.20.2-1 | [DEBIAN-CVE-2020-8562](https://patchblox.com/security/data/fix/linux/debian-cve-2020-8562.md) | Feb 1, 2022 |
| Linux | kubernetes Debian 14 | 1.20.5+really1.20.2-1 | [DEBIAN-CVE-2020-8562](https://patchblox.com/security/data/fix/linux/debian-cve-2020-8562.md) | Feb 1, 2022 |

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