CVE-2020-8562
LowCVSS 2.2Summary
Podatność CVE-2020-8562 dotyczy mechanizmu w Kubernetes, który ma na celu zapobieganie dostępowi do sieci lokalnych i localhost przez połączenia proxy. W wyniku błędu w walidacji odpowiedzi DNS, użytkownik może ominąć te ograniczenia i uzyskać dostęp do prywatnych sieci w kontrolerze.
Risk Assessment
Organizacja może być narażona na nieautoryzowany dostęp do wrażliwych zasobów w sieci kontrolnej, co może prowadzić do poważnych incydentów bezpieczeństwa.
Recommendation
Zaleca się aktualizację Kubernetes do najnowszej wersji, aby załatać tę podatność oraz monitorowanie konfiguracji DNS w celu wykrycia potencjalnych nieprawidłowości.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

