Vulnerability · Published Mar 6, 2023 · Assigned by GitHub_M
CVE-2023-23939Azure/setup-kubectl: Escalation of privilege vulnerability for v3 and lower
Low 3.9
In plain English
A low-severity incorrect permission assignment in setup-kubectl from Azure. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 30% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Azure | setup-kubectl | < 3 |
Weakness: CWE-732 · Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:L