GHSA-P756-RFXH-X63H
Vulnerability from github – Published: 2023-03-07 20:07 – Updated: 2023-03-07 20:07Impact
This vulnerability only impacts versions v2 and lower. 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.
No impacted customers have been reported.
Patches
This has been fixed and released in all versions v3 and later. 755 permissions are used instead.
Workarounds
If users absolutely cannot upgrade to v3 or higher than they should be extra diligent of the other GitHub actions they are using in a workflow and ensure that their GitHub actions runner is secure.
{
"affected": [
{
"package": {
"ecosystem": "GitHub Actions",
"name": "Azure/setup-kubectl"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2023-23939"
],
"database_specific": {
"cwe_ids": [
"CWE-732"
],
"github_reviewed": true,
"github_reviewed_at": "2023-03-07T20:07:27Z",
"nvd_published_at": "2023-03-06T19:15:00Z",
"severity": "LOW"
},
"details": "### Impact\n\nThis vulnerability only impacts versions `v2` and lower. 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.\n\nNo impacted customers have been reported.\n\n### Patches\n\nThis has been fixed and released in all versions `v3` and later. 755 permissions are used instead.\n\n### Workarounds\n\nIf users absolutely cannot upgrade to `v3` or higher than they should be extra diligent of the other GitHub actions they are using in a workflow and ensure that their GitHub actions runner is secure.\n",
"id": "GHSA-p756-rfxh-x63h",
"modified": "2023-03-07T20:07:27Z",
"published": "2023-03-07T20:07:27Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/Azure/setup-kubectl/security/advisories/GHSA-p756-rfxh-x63h"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-23939"
},
{
"type": "WEB",
"url": "https://github.com/Azure/setup-kubectl/commit/d449d75495d2b9d1463555bb00ca3dca77a42ab6"
},
{
"type": "PACKAGE",
"url": "https://github.com/Azure/setup-kubectl"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:N",
"type": "CVSS_V3"
}
],
"summary": "Azure/setup-kubectl: Escalation of privilege vulnerability for v3 and lower"
}
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.