Zitadel - User Registration Bypass

highseverity

7.5CVSS score

2.5%likelihood of exploitation, next 30 days

85%of all CVEs are less likely

Readycheck to confirm it

The open-source identity infrastructure software Zitadel allows administrators to disable the user self-registration. Due to a missing security check in versions prior to 2.64.0, 2.63.5, 2.62.7, 2.61.4, 2.60.4, 2.59.5, and 2.58.7, disabling the "User Registration allowed" option only hid the registration button on the login page. Users could bypass this restriction by directly accessing the registration URL (/ui/login/loginname) and register a user that way. Versions 2.64.0, 2.63.5, 2.62.7, 2.61.4, 2.60.4, 2.59.5, and 2.58.7 contain a patch. No known workarounds are available.

Impact

Unauthenticated users can bypass the disabled user registration restriction and register accounts.

Fix

Update Zitadel to version 2.64.0, 2.63.5, 2.62.7, 2.61.4, 2.60.4, 2.59.5, or 2.58.7 or later.

How to confirm it

Send: GET {{BaseURL}}/ui/login/register
Positive when: not contains "Registration is not allowed (Internal)" AND contains "Enter your Userdata" and "zitadel" AND status 200

Run it with nuclei: nuclei -id CVE-2024-49757 -u <target>

The full check

id: CVE-2024-49757

info:
  name: Zitadel - User Registration Bypass
  author: Sujal Tuladhar
  severity: high
  description: |
    The open-source identity infrastructure software Zitadel allows administrators to disable the user self-registration. Due to a missing security check in versions prior to 2.64.0, 2.63.5, 2.62.7, 2.61.4, 2.60.4, 2.59.5, and 2.58.7, disabling the "User Registration allowed" option only hid the registration button on the login page. Users could bypass this restriction by directly accessing the registration URL (/ui/login/loginname) and register a user that way. Versions 2.64.0, 2.63.5, 2.62.7, 2.61.4, 2.60.4, 2.59.5, and 2.58.7 contain a patch. No known workarounds are available.
  impact: |
    Unauthenticated users can bypass the disabled user registration restriction and register accounts.
  remediation: |
    Update Zitadel to version 2.64.0, 2.63.5, 2.62.7, 2.61.4, 2.60.4, 2.59.5, or 2.58.7 or later.
  reference:
    - https://github.com/zitadel/zitadel/releases/tag/v2.62.7
    - https://nvd.nist.gov/vuln/detail/CVE-2024-49757
  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-2024-49757
    cwe-id: CWE-287
    epss-score: 0.02518
    epss-percentile: 0.84965
  metadata:
    verified: true
    max-request: 1
    shodan-query: title:"Zitadel"
  tags: cve,cve2024,register,zitadel,vuln

http:
  - method: GET
    path:
      - "{{BaseURL}}/ui/login/register"

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - "Registration is not allowed (Internal)"
        negative: true

      - type: word
        part: body
        words:
          - "Enter your Userdata"
          - "zitadel"
        condition: and
        case-insensitive: true

      - type: status
        status:
          - 200

References

Use this check only on systems you are authorised to test. Where the data comes from