CVE-2020-8555: K8s.io/kubernetes Server Side Request Forgery (SSRF) Vulnerability
MODERATECVE-2020-8555 is a MODERATE (CVSS 6.3) server side request forgery (ssrf) vulnerability (CWE-918: Server-Side Request Forgery (SSRF)) affecting K8s.io/kubernetes libraries in the Go ecosystem. The issue involves server side request forgery (ssrf) in kubernetes. Remediation is available by upgrading affected packages to version 1.18.1, 1.17.4, 1.16.9, 1.15.12.
CVE-2020-8555 at a Glance
Security Impact
CVSS: 6.3
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N).
How to Fix CVE-2020-8555
To remediate this vulnerability, upgrade all affected K8s.io/kubernetes 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/kubernetes to 1.18.1Upgrade k8s.io/kubernetes to 1.17.4Upgrade k8s.io/kubernetes to 1.16.9Upgrade k8s.io/kubernetes to 1.15.12Run the following command in your project directory to verify that all resolved dependencies use the patched release:
inspect dependencies for k8s.io/kubernetesHow to Check if You Are Affected
To determine whether your application is affected by CVE-2020-8555, inspect your project dependencies for K8s.io/kubernetes:
inspect dependencies for k8s.io/kubernetesAnalyze the terminal output to locate any version of K8s.io/kubernetes in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.18.1), 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-918: Server-Side Request Forgery (SSRF), where the web server receives a url or similar request from an upstream component and retrieves the contents of this url, but it does not sufficiently ensure that the request is being sent to the expected destination. In K8s.io/kubernetes, 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-2020-8555 Affected K8s.io/kubernetes Versions
4 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
k8s.io/kubernetes
|
Go |
≥ 1.18.0
< 1.18.1
|
1.18.1
|
|
k8s.io/kubernetes
|
Go |
≥ 1.17.0
< 1.17.4
|
1.17.4
|
|
k8s.io/kubernetes
|
Go |
≥ 1.16.0
< 1.16.9
|
1.16.9
|
|
k8s.io/kubernetes
|
Go |
< 1.15.12
|
1.15.12
|
References
Frequently Asked Questions
What is CVE-2020-8555?
Which K8s.io/kubernetes versions are affected?
What version fixes CVE-2020-8555?
Is k8s.io/kubernetes affected?
What is the CVSS score of CVE-2020-8555?
What CWE is associated with CVE-2020-8555?
How can I check Go dependencies for CVE-2020-8555?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-x6mj-w4jf-jmgw",
"modified" : "2023-09-18T22:44:56Z",
"published" : "2022-02-15T01:57:18Z",
"aliases" : [ "CVE-2020-8555" ],
"summary" : "Server Side Request Forgery (SSRF) in Kubernetes",
"details" : "The Kubernetes kube-controller-manager in versions v1.0-1.14, versions prior to v1.15.12, v1.16.9, v1.17.5, and version v1.18.0 are vulnerable to a Server Side Request Forgery (SSRF) that allows certain authorized users to leak up to 500 bytes of arbitrary information from unprotected endpoints within the master's host network (such as link-local or loopback services).",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Go",
"name" : "k8s.io/kubernetes"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "1.18.0"
}, {
"fixed" : "1.18.1"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "k8s.io/kubernetes"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "1.17.0"
}, {
"fixed" : "1.17.4"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "k8s.io/kubernetes"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "1.16.0"
}, {
"fixed" : "1.16.9"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "k8s.io/kubernetes"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "1.15.12"
} ]
} ]
} ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-8555"
}, {
"type" : "WEB",
"url" : "https://github.com/kubernetes/kubernetes/issues/91542"
}, {
"type" : "WEB",
"url" : "https://github.com/kubernetes/kubernetes/pull/89794"
}, {
"type" : "WEB",
"url" : "https://groups.google.com/d/topic/kubernetes-security-announce/kEK27tqqs30/discussion"
}, {
"type" : "WEB",
"url" : "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3SOCLOPTSYABTE4CLTSPDIFE6ZZZR4LX"
}, {
"type" : "WEB",
"url" : "https://security.netapp.com/advisory/ntap-20200724-0005"
}, {
"type" : "WEB",
"url" : "http://www.openwall.com/lists/oss-security/2020/06/01/4"
}, {
"type" : "WEB",
"url" : "http://www.openwall.com/lists/oss-security/2021/05/04/8"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-918" ],
"severity" : "MODERATE",
"github_reviewed" : true,
"github_reviewed_at" : "2021-05-13T20:13:43Z",
"nvd_published_at" : "2020-06-05T17:15:00Z"
}
}