QNAP QTS 4.2.1 Build 20160601 Cross Site Scripting

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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: [email protected]  
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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