CVE-2018-1002100: K8s.io/kubernetes Kubernetes Arbitrary File Overwrite Vulnerability

MODERATE
Advisory Identifier: GHSA-2jq6-ffph-p4h8
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CVSS 5.5
CWE-20
Published
Advisory Summary

CVE-2018-1002100 is a MODERATE (CVSS 5.5) kubernetes arbitrary file overwrite vulnerability (CWE-20: Improper Input Validation) affecting K8s.io/kubernetes libraries in the Go ecosystem. The issue involves kubernetes arbitrary file overwrite. Remediation is available by upgrading affected packages to version 1.9.6.

CVE-2018-1002100 at a Glance

CVE Identifier CVE-2018-1002100
GHSA Identifier GHSA-2jq6-ffph-p4h8
Severity MODERATE
CVSS v3.1 Base Score 5.5
CWE Classification CWE-20: Improper Input Validation
Affected Product K8s.io/kubernetes
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 5.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N).

Attack Vector Local (AV:L)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity High (I:H)
Availability None (A:N)

How to Fix CVE-2018-1002100

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.

k8s.io/kubernetes fixed: 1.9.6 
Upgrade k8s.io/kubernetes to 1.9.6
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/kubernetes

How to Check if You Are Affected

To determine whether your application is affected by CVE-2018-1002100, inspect your project dependencies for K8s.io/kubernetes:

inspect dependencies for k8s.io/kubernetes

Analyze 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 1.9.6), 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

In Kubernetes versions 1.5.x, 1.6.x, 1.7.x, 1.8.x, and prior to version 1.9.6, the kubectl cp command insecurely handles tar data returned from the container, and can be caused to overwrite arbitrary local files.

CVE-2018-1002100 Affected K8s.io/kubernetes Versions

1 component(s)
Fixed Versions:
1.9.6
Product / Package Ecosystem Affected Versions Fixed Version
k8s.io/kubernetes
golang/k8s.io/kubernetes
Go
≥ 1.5.0-alpha.0
< 1.9.6
1.9.6

References

NVD — CVE-2018-1002100 NVD
https://nvd.nist.gov/vuln/detail/CVE-2018-1002100
K8s.io/kubernetes Source Repository REPOSITORY
https://github.com/kubernetes/kubernetes/issues/61297
bugzilla.redhat.com/show_bug.cgi WEB
https://bugzilla.redhat.com/show_bug.cgi?id=1564305
K8s.io/kubernetes Source Repository REPOSITORY
https://github.com/kubernetes/kubernetes
K8s.io/kubernetes Security Information SECURITY
https://hansmi.ch/articles/2018-04-openshift-s2i-security

Frequently Asked Questions

What is CVE-2018-1002100?
CVE-2018-1002100 is a security vulnerability in K8s.io/kubernetes involving Kubernetes arbitrary file overwrite under CWE-20: Improper Input Validation.
Which K8s.io/kubernetes versions are affected?
Affected versions include releases prior to 1.9.6 across affected packages: k8s.io/kubernetes.
What version fixes CVE-2018-1002100?
Upgrading to 1.9.6 (or the latest patched release for your respective branch) resolves the vulnerability.
Is k8s.io/kubernetes affected?
Yes, k8s.io/kubernetes is affected in releases prior to 1.9.6. Upgrade your dependency to 1.9.6 or later.
What is the CVSS score of CVE-2018-1002100?
CVE-2018-1002100 has a CVSS v3.1 base score of 5.5 (MODERATE) with vector string CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.
What CWE is associated with CVE-2018-1002100?
CVE-2018-1002100 is classified under CWE-20: Improper Input Validation (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.).
How can I check Go dependencies for CVE-2018-1002100?
Run the dependency tree command: 'inspect dependencies for k8s.io/kubernetes'. 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-2jq6-ffph-p4h8",
  "modified" : "2026-01-16T21:46:41Z",
  "published" : "2022-05-13T01:35:04Z",
  "aliases" : [ "CVE-2018-1002100" ],
  "summary" : "Kubernetes arbitrary file overwrite",
  "details" : "In Kubernetes versions 1.5.x, 1.6.x, 1.7.x, 1.8.x, and prior to version 1.9.6, the kubectl cp command insecurely handles tar data returned from the container, and can be caused to overwrite arbitrary local files.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "k8s.io/kubernetes"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.5.0-alpha.0"
      }, {
        "fixed" : "1.9.6"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2018-1002100"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/kubernetes/kubernetes/issues/61297"
  }, {
    "type" : "WEB",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=1564305"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/kubernetes/kubernetes"
  }, {
    "type" : "WEB",
    "url" : "https://hansmi.ch/articles/2018-04-openshift-s2i-security"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-20" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-07-21T21:50:42Z",
    "nvd_published_at" : "2018-06-02T01:29:00Z"
  }
}