CVEvulnerability

CVE-2020-8562

3.1 LOW Published 2022-02-01 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2022-02-01
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
2.2 LOW — CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:N
CVSS 3.1 ([email protected])
3.1 LOW — CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
CVSS 2.0 ([email protected])
3.5 LOW — AV:N/AC:M/Au:S/C:P/I:N/A:N
Weaknesses
CWE-367

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.

Affected configurations

• kubernetes kubernetes (<= 1.18.18) • kubernetes kubernetes (>= 1.19.0 <= 1.19.10) • kubernetes kubernetes (>= 1.20.0 <= 1.20.6) • kubernetes kubernetes 1.21.0

Related

Weakness · CWE (1)

  • CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition weakness

References