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CVE-2023-23939— Azure/setup-kubectl: Escalation of privilege vulnerability for v3 and lower

Quick assessment

Affected
Azure setup-kubectl
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

setup-kubectl是在Azure云中安装kubectl的工具。 Azure setup-kubectl 3.0之前版本存在安全漏洞。攻击者利用该漏洞可以升级权限。

CVSS 3.9 · Low EPSS 0.36% · P28
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I. Basic Information for CVE-2023-23939

Vulnerability Information
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Vulnerability Title
Azure/setup-kubectl: Escalation of privilege vulnerability for v3 and lower
Source: CVE Program / CVE List V5
Vulnerability 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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
关键资源的不正确权限授予
Source: CVE Program / CVE List V5
Vulnerability Title
Azure setup-kubectl 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
setup-kubectl是在Azure云中安装kubectl的工具。 Azure setup-kubectl 3.0之前版本存在安全漏洞。攻击者利用该漏洞可以升级权限。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Azure setup-kubectl < 3 -

II. Public POCs for CVE-2023-23939

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III. Intelligence Information for CVE-2023-23939

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Patches & Fixes for CVE-2023-23939 (1)

Vendor Advisories for CVE-2023-23939 (1)

IV. Related Vulnerabilities

Same vendor: Azure
Same weakness: CWE-732

V. Comments for CVE-2023-23939

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