CVE-2023-23939

Published Mar 6, 2023

Last updated a year ago

Overview

Description: Azure/setup-kubectl is a GitHub Action for installing Kubectl. This vulnerability only impacts versions before version 3. An insecure temporary creation of a file allows other actors on the Actions runner to replace the Kubectl binary created by this action because it is world writable. This Kubectl tool installer runs `fs.chmodSync(kubectlPath, 777)` to set permissions on the Kubectl binary, however, this allows any local user to replace the Kubectl binary. This allows privilege escalation to the user that can also run kubectl, most likely root. This attack is only possible if an attacker somehow breached the GitHub actions runner or if a user is utilizing an Action that maliciously executes this attack. This has been fixed and released in all versions `v3` and later. 775 permissions are used instead. Users are advised to upgrade. There are no known workarounds for this issue.
Source: security-advisories@github.com
NVD status: Modified

Hype score: Not currently trending

Risk scores

CVSS 3.1

Type: Primary
Base score: 7
Impact score: 5.9
Exploitability score: 1
Vector string: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Severity: HIGH

Weaknesses

security-advisories@github.com: CWE-732

Configurations

[
  {
    "nodes": [
      {
        "negate": false,
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:a:microsoft:azure_setup_kubectl:*:*:*:*:*:*:*:*",
            "vulnerable": true,
            "matchCriteriaId": "A349BC72-1763-4770-9D6F-F49509C0D780",
            "versionEndExcluding": "3.0"
          }
        ],
        "operator": "OR"
      }
    ]
  }
]

Overview

Social media

Risk scores

CVSS 3.1

Weaknesses

Configurations

References