CVE-2023-2727: K8s.io/kubernetes Kube-apiserver Vulnerable To Policy Bypass Vulnerability
MODERATECVE-2023-2727 is a MODERATE (CVSS 6.5) kube-apiserver vulnerable to policy bypass vulnerability (CWE-20: Improper Input Validation) affecting K8s.io/kubernetes libraries in the Go ecosystem. The issue involves kube-apiserver vulnerable to policy bypass. Remediation is available by upgrading affected packages to version 1.27.3, 1.26.6, 1.25.11, 1.24.15.
CVE-2023-2727 at a Glance
Security Impact
CVSS: 6.5
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:N/S:U/C:H/I:H/A:N).
How to Fix CVE-2023-2727
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 1.27.3Upgrade k8s.io/kubernetes to 1.26.6Upgrade k8s.io/kubernetes to 1.25.11Upgrade k8s.io/kubernetes to 1.24.15Run 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-2023-2727, 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 1.27.3), 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-20: Improper Input Validation, where the product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. 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-2023-2727 Affected K8s.io/kubernetes Versions
4 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
k8s.io/kubernetes
|
Go |
≥ 1.27.0
< 1.27.3
|
1.27.3
|
|
k8s.io/kubernetes
|
Go |
≥ 1.26.0
< 1.26.6
|
1.26.6
|
|
k8s.io/kubernetes
|
Go |
≥ 1.25.0
< 1.25.11
|
1.25.11
|
|
k8s.io/kubernetes
|
Go |
< 1.24.15
|
1.24.15
|
References
Frequently Asked Questions
What is CVE-2023-2727?
Which K8s.io/kubernetes versions are affected?
What version fixes CVE-2023-2727?
Is k8s.io/kubernetes affected?
What is the CVSS score of CVE-2023-2727?
What CWE is associated with CVE-2023-2727?
How can I check Go dependencies for CVE-2023-2727?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-qc2g-gmh6-95p4",
"modified" : "2025-02-13T19:00:59Z",
"published" : "2023-07-03T21:30:57Z",
"aliases" : [ "CVE-2023-2727" ],
"summary" : "kube-apiserver vulnerable to policy bypass",
"details" : "Users may be able to launch containers using images that are restricted by ImagePolicyWebhook when using ephemeral containers. Kubernetes clusters are only affected if the ImagePolicyWebhook admission plugin is used together with ephemeral containers.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Go",
"name" : "k8s.io/kubernetes"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "1.27.0"
}, {
"fixed" : "1.27.3"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "k8s.io/kubernetes"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "1.26.0"
}, {
"fixed" : "1.26.6"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "k8s.io/kubernetes"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "1.25.0"
}, {
"fixed" : "1.25.11"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "k8s.io/kubernetes"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "1.24.15"
} ]
} ]
} ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2023-2727"
}, {
"type" : "WEB",
"url" : "https://github.com/kubernetes/kubernetes/issues/118640"
}, {
"type" : "WEB",
"url" : "https://github.com/kubernetes/kubernetes/pull/118356"
}, {
"type" : "WEB",
"url" : "https://github.com/kubernetes/kubernetes/pull/118471"
}, {
"type" : "WEB",
"url" : "https://github.com/kubernetes/kubernetes/pull/118473"
}, {
"type" : "WEB",
"url" : "https://github.com/kubernetes/kubernetes/pull/118474"
}, {
"type" : "WEB",
"url" : "https://github.com/kubernetes/kubernetes/pull/118512"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/kubernetes/kubernetes"
}, {
"type" : "WEB",
"url" : "https://groups.google.com/g/kubernetes-security-announce/c/vPWYJ_L84m8"
}, {
"type" : "WEB",
"url" : "https://security.netapp.com/advisory/ntap-20230803-0004"
}, {
"type" : "WEB",
"url" : "http://www.openwall.com/lists/oss-security/2023/07/06/2"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-20" ],
"severity" : "MODERATE",
"github_reviewed" : true,
"github_reviewed_at" : "2023-07-05T22:46:57Z",
"nvd_published_at" : "2023-07-03T21:15:09Z"
}
}