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Advisory ID: SYSS-2017-002
Product: Simplessus Files
Manufacturer: Simplessus
Affected Version(s): 3.7.7
Tested Version(s): 3.7.7
Vulnerability Type: Cross-Site Scripting (CWE-79) 
Risk Level: Medium
Solution Status: Fixed
Manufacturer Notification: January 25, 2017
Solution Date: January 25, 2017
Public Disclosure: February 16, 2017
CVE Reference: Not yet assigned
Author of Advisory: Dr. Adrian Vollmer, SySS GmbH

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Product overview:

Simplessus Files is a file sharing web application.

The manufacturer describes the product as follows (see [1]):

    Simplessus Files is a simple software solution to exchange files and
    documents over the internet. No more file sharing via e-mail, FTP or
    CD-ROM with Simplessus Files replace very large files online easily.

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Vulnerability overview:

Due to insufficient filtering of user controlled input, Simplessus Files is
vulnerable to reflected cross-site scripting.

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Vulnerability Details:

The value of the GET parameter 'action' is reflected in the server response
without proper encoding. Injected JavaScript is thus executed in the
browser.

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Proof of Concept (PoC):

Following this link executes JavaScript in the victim's browser, resulting
in an alert box being displayed:

https://<HOSTNAME>/?action=%3Cscript%3Ealert(1)%3C%2fscript%3E

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Solution:

Update to software version to 3.8.3.

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Disclosure Timeline:

2017-01-13: Vulnerability discovered
2017-01-25: Vulnerability reported
2017-01-25: Vendor confirmation
2017-02-15: Public disclosure

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References:

[1] Product website for Simplessus Files
    http://files.simplessus.com
[2] SySS Security Advisory SYSS-2017-002
    https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2017-002.txt
[3] SySS Responsible Disclosure Policy
    https://www.syss.de/en/news/responsible-disclosure-policy/

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Credits:

This security vulnerability was found by Dr. Adrian Vollmer of SySS GmbH.

E-Mail: adrian.vollmer@syss.de
Public Key: https://www.syss.de/fileadmin/dokumente/PGPKeys/Adrian_Vollmer.asc
Key ID: 0x037C9FE7
Key Fingerprint: 70CF E88C AEE7 DB0F 5DC8 3403 0E02 7C7E 037C 9FE7

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Disclaimer:

The information provided in this security advisory is provided "as is" 
and without warranty of any kind. Details of this security advisory may
be updated in order to provide as accurate information as possible. The
latest version of this security advisory is available on the SySS Web
site.

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Copyright:

Creative Commons - Attribution (by) - Version 3.0
URL: http://creativecommons.org/licenses/by/3.0/deed.en

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