CVE-2020-8562
CVSS V2 Low 3.5
CVSS V3 Low 3.1
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.
Overview
- CVE ID
- CVE-2020-8562
- Assigner
- jordan@liggitt.net
- Vulnerability Status
- Analyzed
- Published Version
- 2022-02-01T11:15:10
- Last Modified Date
- 2022-03-29T16:35:38
Weakness Enumerations
CPE Configuration (Product)
| CPE | Vulnerable | Operator | Version Start | Version End |
|---|---|---|---|---|
| cpe:2.3:a:kubernetes:kubernetes:*:*:*:*:*:*:*:* | 1 | OR | 1.18.18 | |
| cpe:2.3:a:kubernetes:kubernetes:*:*:*:*:*:*:*:* | 1 | OR | 1.19.0 | 1.19.10 |
| cpe:2.3:a:kubernetes:kubernetes:*:*:*:*:*:*:*:* | 1 | OR | 1.20.0 | 1.20.6 |
| cpe:2.3:a:kubernetes:kubernetes:1.21.0:*:*:*:*:*:*:* | 1 | OR |
CVSS Version 2
- Version
- 2.0
- Vector String
- AV:N/AC:M/Au:S/C:P/I:N/A:N
- Access Vector
- NETWORK
- Access Compatibility
- MEDIUM
- Authentication
- SINGLE
- Confidentiality Impact
- PARTIAL
- Integrity Impact
- NONE
- Availability Impact
- NONE
- Base Score
- 3.5
- Severity
- LOW
- Exploitability Score
- 6.8
- Impact Score
- 2.9
CVSS Version 3
- Version
- 3.1
- Vector String
- CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
- Attack Vector
- NETWORK
- Attack Compatibility
- HIGH
- Privileges Required
- LOW
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality Impact
- LOW
- Availability Impact
- NONE
- Base Score
- 3.1
- Base Severity
- LOW
- Exploitability Score
- 1.6
- Impact Score
- 1.4
References
| Reference URL | Reference Tags |
|---|---|
| https://groups.google.com/g/kubernetes-security-announce/c/-MFX60_wdOY | Mailing List Third Party Advisory |
| https://github.com/kubernetes/kubernetes/issues/101493 | Issue Tracking Mitigation Third Party Advisory |
| https://security.netapp.com/advisory/ntap-20220225-0002/ | Third Party Advisory |
Sources
| Source Name | Source URL |
|---|---|
| NIST | https://nvd.nist.gov/vuln/detail/CVE-2020-8562 |
| MITRE | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-8562 |
History
| Created | Old Value | New Value | Data Type | Notes |
|---|---|---|---|---|
| 2022-04-04 00:41:01 | Added to TrackCVE | |||
| 2022-12-06 08:14:28 | security@kubernetes.io | jordan@liggitt.net | CVE Assigner | updated |
| 2022-12-06 08:14:28 | 2022-02-01T11:15Z | 2022-02-01T11:15:10 | CVE Published Date | updated |
| 2022-12-06 08:14:28 | 2022-03-29T16:35:38 | CVE Modified Date | updated | |
| 2022-12-06 08:14:28 | Analyzed | Vulnerability Status | updated |