Ecshop支付模块注入那个漏洞

<?php 
$test=str_replace($_GET['a'],'',$_GET['b']); 
echo $test; 
?>

test.php?a=&b=%00'

\0\'

把0给替掉

test.php?a=0&b=%00' 

\\'

摘自:http://zone.wooyun.org/content/2700