CVE-2020-8559: K8s.io/apimachinery Privilege Escalation Vulnerability
MODERATECVE-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.
CVE-2020-8559 at a Glance
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).
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.
Upgrade k8s.io/apimachinery to 0.16.13Upgrade k8s.io/apimachinery to 0.17.9Upgrade k8s.io/apimachinery to 0.18.7Upgrade k8s.io/kubernetes to 1.16.13Upgrade k8s.io/kubernetes to 1.17.9Upgrade k8s.io/kubernetes to 1.18.7Run the following command in your project directory to verify that all resolved dependencies use the patched release:
inspect dependencies for k8s.io/apimachineryHow 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/apimachineryAnalyze 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
CVE-2020-8559 Affected K8s.io/apimachinery Versions
6 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
k8s.io/apimachinery
|
Go |
< 0.16.13
|
0.16.13
|
|
k8s.io/apimachinery
|
Go |
≥ 0.17.0
< 0.17.9
|
0.17.9
|
|
k8s.io/apimachinery
|
Go |
≥ 0.18.0
< 0.18.7
|
0.18.7
|
|
k8s.io/kubernetes
|
Go |
< 1.16.13
|
1.16.13
|
|
k8s.io/kubernetes
|
Go |
≥ 1.17.0
< 1.17.9
|
1.17.9
|
|
k8s.io/kubernetes
|
Go |
≥ 1.18.0
< 1.18.7
|
1.18.7
|
References
Frequently Asked Questions
What is CVE-2020-8559?
Which K8s.io/apimachinery versions are affected?
What version fixes CVE-2020-8559?
Is k8s.io/apimachinery affected?
Is k8s.io/kubernetes affected?
What is the CVSS score of CVE-2020-8559?
What CWE is associated with CVE-2020-8559?
How can I check Go dependencies for CVE-2020-8559?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"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" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Go",
"name" : "k8s.io/apimachinery"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "0.16.13"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "k8s.io/apimachinery"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0.17.0"
}, {
"fixed" : "0.17.9"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "k8s.io/apimachinery"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0.18.0"
}, {
"fixed" : "0.18.7"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "k8s.io/kubernetes"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "1.16.13"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "k8s.io/kubernetes"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "1.17.0"
}, {
"fixed" : "1.17.9"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "k8s.io/kubernetes"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "1.18.0"
}, {
"fixed" : "1.18.7"
} ]
} ]
} ],
"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"
}
}