Vulnerabilities in pkg:golang/k8s.io/apimachinery

PACKAGE
Advisory Identifier: GHSA-33c5-9fx5-fvjm
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Advisory Summary

CVE-2020-8559 is a MODERATE (CVSS 6.8) privilege escalation vulnerability (CWE-601: URL Redirection to Untrusted Site ('Open Redirect')) affecting K8s.io/apimachinery libraries in the Go ecosystem. The issue involves privilege escalation in kubernetes. Remediation is available by upgrading affected packages to version 0.16.13, 0.17.9, 0.18.7, 1.16.13, 1.17.9, 1.18.7.

2 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:golang/k8s.io/apimachinery

2 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:golang/k8s.io/apimachinery. Select an advisory below to view technical details or fixes.

Advisory ID CVE / NVD Severity Summary
GHSA-33c5-9fx5-fvjm CVE-2020-8559 MODERATE Privilege Escalation in Kubernetes
GHSA-74fp-r6jw-h4mp - HIGH Kubernetes apimachinery packages vulnerable to unbounded recursion in JSON or YAML parsing

CVE-2020-8559 at a Glance

CVE Identifier CVE-2020-8559
GHSA Identifier GHSA-33c5-9fx5-fvjm
Severity MODERATE
CVSS v3.1 Base Score 6.8
CWE Classification CWE-601: URL Redirection to Untrusted Site ('Open Redirect')
Affected Product K8s.io/apimachinery
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 6.8

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required High (PR:H)
User Interaction Required (UI:R)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2020-8559

To remediate this vulnerability, upgrade all affected K8s.io/apimachinery dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

k8s.io/apimachinery fixed: 0.16.13 
Upgrade k8s.io/apimachinery to 0.16.13
k8s.io/apimachinery fixed: 0.17.9 
Upgrade k8s.io/apimachinery to 0.17.9
k8s.io/apimachinery fixed: 0.18.7 
Upgrade k8s.io/apimachinery to 0.18.7
k8s.io/kubernetes fixed: 1.16.13 
Upgrade k8s.io/kubernetes to 1.16.13
k8s.io/kubernetes fixed: 1.17.9 
Upgrade k8s.io/kubernetes to 1.17.9
k8s.io/kubernetes fixed: 1.18.7 
Upgrade k8s.io/kubernetes to 1.18.7
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for k8s.io/apimachinery

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-8559, inspect your project dependencies for K8s.io/apimachinery:

inspect dependencies for k8s.io/apimachinery

Analyze the terminal output to locate any version of K8s.io/apimachinery in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.16.13), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-601: URL Redirection to Untrusted Site ('Open Redirect'), where the web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect. In K8s.io/apimachinery, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

The Kubernetes kube-apiserver in versions v1.6-v1.15, and versions prior to v1.16.13, v1.17.9 and v1.18.7 are vulnerable to an unvalidated redirect on proxied upgrade requests that could allow an attacker to escalate privileges from a node compromise to a full cluster compromise.

CVE-2020-8559 Affected K8s.io/apimachinery Versions

6 component(s)
Fixed Versions:
0.16.130.17.90.18.71.16.131.17.91.18.7
Product / Package Ecosystem Affected Versions Fixed Version
k8s.io/apimachinery
golang/k8s.io/apimachinery
Go
< 0.16.13
0.16.13
k8s.io/apimachinery
golang/k8s.io/apimachinery
Go
≥ 0.17.0
< 0.17.9
0.17.9
k8s.io/apimachinery
golang/k8s.io/apimachinery
Go
≥ 0.18.0
< 0.18.7
0.18.7
k8s.io/kubernetes
golang/k8s.io/kubernetes
Go
< 1.16.13
1.16.13
k8s.io/kubernetes
golang/k8s.io/kubernetes
Go
≥ 1.17.0
< 1.17.9
1.17.9
k8s.io/kubernetes
golang/k8s.io/kubernetes
Go
≥ 1.18.0
< 1.18.7
1.18.7

References

NVD — CVE-2020-8559 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-8559
K8s.io/apimachinery Source Repository REPOSITORY
https://github.com/kubernetes/kubernetes/issues/92914
K8s.io/apimachinery Source Repository REPOSITORY
https://github.com/kubernetes/kubernetes/pull/92941
bugzilla.redhat.com/show_bug.cgi WEB
https://bugzilla.redhat.com/show_bug.cgi?id=1851422
K8s.io/apimachinery Source Repository REPOSITORY
https://github.com/kubernetes/kubernetes
K8s.io/apimachinery Source Repository REPOSITORY
https://github.com/tdwyer/CVE-2020-8559
K8s.io/apimachinery Security Information SECURITY
https://groups.google.com/d/msg/kubernetes-security-announce/JAIGG5yNROs/19nHQ5wkBwAJ
K8s.io/apimachinery Security Information SECURITY
https://groups.google.com/g/kubernetes-security-announce/c/JAIGG5yNROs
K8s.io/apimachinery Security Information SECURITY
https://security.netapp.com/advisory/ntap-20200810-0004

Frequently Asked Questions

What is CVE-2020-8559?
CVE-2020-8559 is a security vulnerability in K8s.io/apimachinery involving Privilege Escalation in Kubernetes under CWE-601: URL Redirection to Untrusted Site ('Open Redirect').
Which K8s.io/apimachinery versions are affected?
Affected versions include releases prior to 0.16.13, 0.17.9, 0.18.7, 1.16.13, 1.17.9, 1.18.7 across affected packages: k8s.io/apimachinery, k8s.io/kubernetes.
What version fixes CVE-2020-8559?
Upgrading to 0.16.13, 0.17.9, 0.18.7, 1.16.13, 1.17.9, 1.18.7 (or the latest patched release for your respective branch) resolves the vulnerability.
Is k8s.io/apimachinery affected?
Yes, k8s.io/apimachinery is affected in releases prior to 0.16.13, 0.17.9, 0.18.7. Upgrade your dependency to 0.16.13, 0.17.9, 0.18.7 or later.
Is k8s.io/kubernetes affected?
Yes, k8s.io/kubernetes is affected in releases prior to 1.16.13, 1.17.9, 1.18.7. Upgrade your dependency to 1.16.13, 1.17.9, 1.18.7 or later.
What is the CVSS score of CVE-2020-8559?
CVE-2020-8559 has a CVSS v3.1 base score of 6.8 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2020-8559?
CVE-2020-8559 is classified under CWE-601: URL Redirection to Untrusted Site ('Open Redirect') (The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect.).
How can I check Go dependencies for CVE-2020-8559?
Run the dependency tree command: 'inspect dependencies for k8s.io/apimachinery'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-33c5-9fx5-fvjm",
  "modified" : "2024-05-20T22:08:21Z",
  "published" : "2024-04-24T20:01:22Z",
  "aliases" : [ "CVE-2020-8559" ],
  "summary" : "Privilege Escalation in Kubernetes",
  "details" : "The Kubernetes kube-apiserver in versions v1.6-v1.15, and versions prior to v1.16.13, v1.17.9 and v1.18.7 are vulnerable to an unvalidated redirect on proxied upgrade requests that could allow an attacker to escalate privileges from a node compromise to a full cluster compromise.",
  "severity" : [ {
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  } ],
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    } ]
  }, {
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      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-8559"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/kubernetes/kubernetes/issues/92914"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/kubernetes/kubernetes/pull/92941"
  }, {
    "type" : "WEB",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=1851422"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/kubernetes/kubernetes"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/tdwyer/CVE-2020-8559"
  }, {
    "type" : "WEB",
    "url" : "https://groups.google.com/d/msg/kubernetes-security-announce/JAIGG5yNROs/19nHQ5wkBwAJ"
  }, {
    "type" : "WEB",
    "url" : "https://groups.google.com/g/kubernetes-security-announce/c/JAIGG5yNROs"
  }, {
    "type" : "WEB",
    "url" : "https://security.netapp.com/advisory/ntap-20200810-0004"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-601" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-04-24T20:01:22Z",
    "nvd_published_at" : "2020-07-22T14:15:00Z"
  }
}