VDB
CVE-2020-8562
CVE-2020-8562
REJECTED
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.
EPSS 0.06% · 17.8th percentile
Risk Scores
EPSS Score
0.06%
17.8th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Ubuntu:22.04:LTS | kubernetes | 0, 1.0 |
| Ubuntu:Pro:20.04:LTS | kubernetes | 0, 1.0 |
| Ubuntu:24.04:LTS | kubernetes | 1.0, 0 |
Exploit Intelligence
- Bypass apiserver proxy filter (hackerone)
- Bypass apiserver proxy filter (hackerone)
- Bypass apiserver proxy filter (hackerone)
- CVE.json (github-poc)
- CVE.json (github-poc)
- CVE.json (github-poc)
- CVE.json (github-poc)
- CVE.json (github-poc)
- CVE.json (github-poc)
- CVE.json (github-poc)
…and 2 more exploits
Timeline
- CVE Published
- May 27, 2021 PoC Published
- Feb 2, 2022 EPSS Score
- Mar 27, 2022 EPSS Score
- May 18, 2022 EPSS Score
- Jul 10, 2022 EPSS Score
- Sep 2, 2022 EPSS Score
- Oct 24, 2022 EPSS Score
- Dec 16, 2022 EPSS Score
- Feb 7, 2023 EPSS Score
- Mar 7, 2023 EPSS Score
- Mar 31, 2023 EPSS Score
References
- https://ubuntu.com/security/CVE-2020-8562 third-party-advisory
- https://www.openwall.com/lists/oss-security/2021/05/04/8 third-party-advisory
- https://www.cve.org/CVERecord?id=CVE-2020-8562 third-party-advisory