CVE-2020-8562 (GCVE-0-2020-8562)

Vulnerability from cvelistv5 – Published: 2022-02-01 10:33 – Updated: 2024-09-16 17:08
VLAI?
Summary
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.
Severity ?
2.2 (Low)
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:N
CWE
  • CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
Assigner
References
Impacted products
Vendor Product Version
Kubernetes Kubernetes Affected: unspecified , ≤ v1.18.18 (custom)
Unknown: next of v1.18.18 , < unspecified (custom)
Affected: unspecified , ≤ v1.19.10 (custom)
Unknown: next of v1.19.10 , < unspecified (custom)
Affected: unspecified , ≤ v1.20.6 (custom)
Unknown: next of v1.20.6 , < unspecified (custom)
Affected: unspecified , ≤ v1.21.0 (custom)
Unknown: next of v1.21.0 , < unspecified (custom)
Create a notification for this product.
Credits
Javier Provecho
Show details on NVD website
To clipboard 

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Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.