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CVE-2020-8562

LOW
Published 2022-02-01T10:33:00.317144Z
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CVSS Score

V3.1
2.2
/10
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:N
Base Score Metrics
Exploitability: N/A Impact: N/A

EPSS Score

v2025.03.14
0.001
probability
of exploitation in the wild

There is a 0.1% chance that this vulnerability will be exploited in the wild within the next 30 days.

Updated: 2025-06-25
Exploit Probability
Percentile: 0.185
Higher than 18.5% of all CVEs

Attack Vector Metrics

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED

Impact Metrics

Confidentiality
LOW
Integrity
NONE
Availability
NONE

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.

Available Exploits

No exploits available for this CVE.

Related News

No news articles found for this CVE.

Affected Products

Kubernetes

Kubernetes

Affected Versions:

unspecified next of v1.18.18 unspecified next of v1.19.10 unspecified next of v1.20.6 unspecified next of v1.21.0

GitHub Security Advisories

Community-driven vulnerability intelligence from GitHub

✓ GitHub Reviewed LOW

Potential proxy IP restriction bypass in Kubernetes

GHSA-qh36-44jv-c8xj

Advisory Details

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. All versions of Kubernetes are impacted, and there is no fix in place.

Affected Packages

Go k8s.io/kubernetes
ECOSYSTEM: ≥1.21.0 ≤1.21.1
Go k8s.io/kubernetes
ECOSYSTEM: ≥1.20.0 ≤1.20.7
Go k8s.io/kubernetes
ECOSYSTEM: ≥1.19.0 ≤1.19.11
Go k8s.io/kubernetes
ECOSYSTEM: ≥0 ≤1.18.19

CVSS Scoring

CVSS Score

2.5

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

References

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2020-8562
WEB https://github.com/kubernetes/kubernetes/issues/101493
WEB https://github.com/kubernetes/kubernetes/issues/101493#issuecomment-2272095629
PACKAGE https://github.com/kubernetes/kubernetes
WEB https://groups.google.com/g/kubernetes-security-announce/c/-MFX60_wdOY
WEB https://security.netapp.com/advisory/ntap-20220225-0002

Advisory provided by GitHub Security Advisory Database. Published: February 2, 2022, Modified: August 6, 2024

References

https://github.com/kubernetes/kubernetes/issues/101493
https://groups.google.com/g/kubernetes-security-announce/c/-MFX60_wdOY
https://security.netapp.com/advisory/ntap-20220225-0002/
Published: 2022-02-01T10:33:00.317144Z
Last Modified: 2024-09-16T17:08:37.065Z
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