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nvd[email protected]NVD:CVE-2023-23939
HistoryMar 06, 2023 - 7:15 p.m.

CVE-2023-23939

2023-03-0619:15:10
CWE-732
web.nvd.nist.gov
3
azure/setup-kubectl
github action
kubectl installation
vulnerability fix
permissions issue
privilege escalation
upgrade advice

CVSS3

7

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

AI Score

5.2

Confidence

High

EPSS

0.001

Percentile

17.9%

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.

Affected configurations

Nvd
Node
microsoftazure_setup_kubectlRange<3.0
VendorProductVersionCPE
microsoftazure_setup_kubectl*cpe:2.3:a:microsoft:azure_setup_kubectl:*:*:*:*:*:*:*:*

CVSS3

7

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

AI Score

5.2

Confidence

High

EPSS

0.001

Percentile

17.9%

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