The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Attack Complexity
Low
AC
The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required
Low
PR
The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.
Scope
Unchanged
S
An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality
Low
C
There is some impact on confidentiality, but the attacker either does not gain control of any data, or the information obtained does not have a significant impact on the system or its operations.
Integrity
Low
I
Modification of data is possible, but the attacker does not have control over what can be modified, or the extent of what the attacker can affect is limited. The data modified does not have a direct, serious impact on the system.
Availability
None
A
There is no impact on the availability of the system; the attacker does not have the ability to disrupt access to or use of the system.
[waraxe-2012-SA#087] - Reflected XSS in Joomla 1.5.26 "ja_purity" template
===============================================================================
Author: Janek Vind "waraxe"
Date: 03. May 2012
Location: Estonia, Tartu
Web: http://www.waraxe.us/advisory-87.html
CVE: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-2413
Description of vulnerable software:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Joomla is one of the world's most popular open source CMS (content management
system). With millions of websites running on Joomla, the software is used by
individuals, small & medium-sized businesses, and large organizations worldwide
to easily create & build a variety of websites & web-enabled applications.
Vulnerable versions
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Affected is Joomla version 1.5.26, older versions may be vulnerable as well.
###############################################################################
1. Reflected XSS in Joomla 1.5.26 "ja_purity" template
###############################################################################
CVE Information:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2012-2413 to this issue. This is a candidate for inclusion in
the CVE list (http://cve.mitre.org/), which standardizes names for
security problems.
Vulnerability Details:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Reason: outputting html data without proper encoding
Attack vector: user-provided cookie parameter
Preconditions:
1. "ja_purity" template must be in use
Result: XSS attack possibilities
Source code snippet from "templates/ja_purity/html/modules.php":
-----------------[ source code start ]---------------------------------
function modChrome_jarounded($module, &$params, &$attribs)
{
?>
<div class="jamod module<?php echo $params->get('moduleclass_sfx'); ?>" id="Mod<?php echo $module->id; ?>">
<div>
<div>
<div>
<?php if ($module->showtitle != 0) : ?>
<?php
if(isset($_COOKIE['Mod'.$module->id])) $modhide = $_COOKIE['Mod'.$module->id];
else $modhide = 'show';
?>
<h3 class="<?php echo $modhide; ?>"><span><?php echo $module->title; ?></span></h3>
-----------------[ source code end ]-----------------------------------
As seen above, user-provided cookie parameter is used for outputting html.
No data sanitization, which indicates Reflected XSS vulnerability issue.
Disclosure Timeline:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
20.04.2012 Developers contacted via email, no response
24.04.2012 CVE identifier request
25.04.2012 Got CVE identifier
26.04.2012 Second attempt contacting developers via email, no response
03.05.2012 Advisory published
Contact:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[email protected]
Janek Vind "waraxe"
Waraxe forum: http://www.waraxe.us/forums.html
Personal homepage: http://www.janekvind.com/
Random project: http://albumnow.com/
---------------------------------- [ EOF ] ------------------------------------
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