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dvisory ID: SYSS-2016-051
Product: QNAP QTS
Manufacturer: QNAP
Affected Version(s): 4.2.1 Build 20160601
Tested Version(s): 4.2.1 Build 20160601 - 4.2.2 Build 20160812
Vulnerability Type: Reflected Cross-Site Scripting (CWE-79)
Risk Level: Medium
Solution Status: unfixed
Manufacturer Notification: 2016-06-06
Solution Date: tbd.
Public Disclosure: 2016-08-18
CVE Reference: Not assigned
Author of Advisory: Sebastian Nerz (SySS GmbH)

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Overview:

QTS is the operating system used by manufacturer QNAP on its series of
NAS devices.

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Vulnerability Details:

The SySS GmbH found a reflected cross-site scripting vulnerability in 
the /cgi-bin/application/appRequest.cgi component of the QTS administrative 
interface.

This type of vulnerability allows an attacker to create an URL which, when
opened in the victims browser, leads to the display of active element like
inserted JavaScript code in the victims browser, leading to the exeuction
of this code. The code can then be used to e.g. execute commands in the 
scope of the user, infect the users browser and so on.

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Proof of Concept (PoC):

1. Open the following URL in a browser without sufficient rXSS protection
(e.g. Firefox):
http://[QNAPIP]:8080/cgi-bin/application/appRequest.cgi?action=getQPKGDownloads&qname=Testlink%3Cimg%20src=foo%20onError=alert%281%29%3E


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Solution:

The manufacturer has not released any security update or patch so far.
Administrators of QNAP QTS 4.2 installations should restrict access to a
QNAP device to trusted users. Users should be informed about the 
vulnerability and tutored about security awareness.

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Disclosure Timeline:

2016-06-06: Vulnerability discovered and reported to manufacturer
2016-06-20: Vulnerability report confirmed by manufacturer
2016-07-06: Manufacturer asked for timeline regarding a fix
2016-07-18: Manufacturer reminded about upcoming public disclosure
2016-08-18: Public disclosure

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References:

[1] Product website for QNAP QTS
    http://www.qnap.com/qts/4.2/en/
[2] SySS Security Advisory SYSS-2016-051
    https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2016-051.txt
[3] SySS Responsible Disclosure Policy
    https://www.syss.de/en/responsible-disclosure-policy/
    
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Credits:

Security vulnerability found by Sebastian Nerz of the SySS GmbH.

E-Mail: sebastian.nerz@syss.de
Public Key:
https://www.syss.de/fileadmin/dokumente/Materialien/PGPKeys/Sebastian_Nerz.asc
Key ID: 0x9180FDB2
Key Fingerprint: 79DC 2CEC D18D F92F CBB4 AF09 D12D 26A4 9180 FDB2

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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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