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.
CVSS Metrics
- Vector
- CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:N
- Attack Vector
- network
- Complexity
- high
- Privileges
- high
- User Action
- none
- Scope
- unchanged
- Confidentiality
- low
- Integrity
- none
- Availability
- none
- Weaknesses
- CWE-367CWE-367
Metadata
- Primary Vendor
- KUBERNETES
- Published
- 2/1/2022
- Last Modified
- 11/21/2024
- Source
- NIST NVD
- Note: Verify all details with official vendor sources before applying patches.
Affected Products
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