%00截断绕过
过滤代码
<?php
if(isset($_GET['filename'])){
include $_GET['filename'] . ".php";
}else{
echo "包含失败";
}
?>上面这段代码的意思就是，我会将你传入的这个filename参数后面加上.php，比如传入参数webshell.php，经过这段代码的处理就会变成webshell.php.php，去寻找该文件的时候就找不到该文件，就会包含失败
演示
以下是webshell.php
<?php phpinfo();?>我们尝试包含该文件
发现包含失败，这时候我们使用%00截断
成功绕过
总结
%00的意思就是到这里结束了，所以当文件名为webshell.jpg%00时即便是后面拼接了.php编程webshell.jpg%00.php，也会在解析的时候解析成webshell.jpg，再结合包含漏洞会将webshell.jpg该文件以php的形式解析
str_replace替换函数绕过
str_repalc()函数的功能是替换
$file = $_GET['filename'];
$file = str_replace(array("http://","https://"),"",$file); // 如果有遇到 "http://或者https://"就替换成""
$file = str_replace(array("../","..\"),"",$file); // 如果有遇到 "../或者..\"就替换成""但是str_replace他只替换一次，也就是说如果我们要使用../去做目录穿越的话我们多加一个../即可绕过
原先我们要访问的目录是 ../../xxx.txt，这时候我们改为 ../../../xxx.txt，他依然可以访问成功。
../../../xxx.txt替换后 -> ../../xxx.txt
防御手段
限制死能够包含的文件
if(filename!=xxx && filename!=xxx ...){
echo "error";
exit;
}
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