[SCSA-003] Multiple Cross Site Scripting & Script Injection Vulnerabilities in Nuked-Klan
From: Grégory (gregory.lebras@security-corp.org)
Date: 01/27/03
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Date: 27 Jan 2003 20:23:31 -0000 From: "Grégory" Le Bras <gregory.lebras@security-corp.org> To: bugtraq@securityfocus.com('binary' encoding is not supported, stored as-is)
.: Multiple Cross Site Scripting & Script Injection Vulnerabilities in
Nuked-Klan :.
________________________________________________________________________
Security Corporation Security Advisory [SCSA-003]
________________________________________________________________________
PROGRAM: Nuked-Klan
HOMEPAGE: http://www.nuked-klan.org
VULNERABLE VERSIONS: beta 1.2 and prior
________________________________________________________________________
DESCRIPTION
________________________________________________________________________
Nuked Klan is a PHP Gateway for "clans". (direct quote from Nuked Klan
website)
DETAILS & EXPLOITS
________________________________________________________________________
Many Cross-Site Scripting vulnerabilities have been found in Nuked Klan
which allow attackers to inject script codes into the page and use them on
clients browser as if they were provided by the site.
These Cross-Site Scripting vulnerabilities are found in the following
modules : Guestbook, Forum, Shoutbox.
An attacker can input specially crafted links and/or other malicious
scripts.
Guestbook
________________________________________________________________________
A vulnerability was discovered in the page for posting messages, at this
adress :
http://[target]/index.php?file=Guestbook&req=post_book
The vulnerability is at the level of the interpretation of the "Author"
field.
Indeed, the insertion of a hostile code script in this field makes it
possible to a malicious user to carry out this script on the navigator of
the visitors.
The hostile code could be :
[script]alert("Cookie="+document.cookie)[/script]
(open a window with the cookie of the visitor.)
(replace [] by <>)
Forum
________________________________________________________________________
A vulnerability was discovered in the page for posting new messages in the
forum, at this adress :
http://[target]/index.php?file=Forum&op=post_screen&forum_id=0
The vulnerability is at the level of the interpretation of the "Titre" and
"Pseudo" field.
Indeed, the insertion of a hostile code script in this field makes it
possible to a malicious user to carry out this script on the navigator of
the visitors.
The hostile code could be :
[script]alert("Cookie="+document.cookie)[/script]
(open a window with the cookie of the visitor.)
(replace [] by <>)
Shoutbox
________________________________________________________________________
A vulnerability was discovered in the page for posting messages in "La
Tribune Libre".
Indeed, the insertion of a hostile code script in this field makes it
possible to a malicious user to carry out this script on the navigator of
the visitors.
The hostile code could be :
[script]alert("Cookie="+document.cookie)[/script]
(open a window with the cookie of the visitor.)
(replace [] by <>)
-------Vulnerable line in submit.php--------
$shout = str_replace("|","",$SB_text);
--------------------------------------------
Possible solutions: modify the code in order to analyze the whole of the
text sent by the user and to replace the hostile elements.
---------------Code example-----------------
<?
$SB_text = str_replace("<", "[", $SB_text);
$SB_text = str_replace(">", "]", $SB_text);
$SB_text = htmlentities($SB_text);
$shout = str_replace("|","",$SB_text);
?>
--------------------------------------------
SOLUTIONS
________________________________________________________________________
Upgrade your version to beta 1.3
Upgrade Guestbook with the appropriate patch :
http://tomysnockers.net/download/Guestbook.rar
Upgrade Shoutbox with the appropriate patch :
http://www.nuked-klan.org/files/Shoutbox_13.zip
VENDOR STATUS
________________________________________________________________________
The vendor has reportedly been notified.
LINKS
________________________________________________________________________
http://www.security-corp.org/index.php?ink=4-15-1
French Version : http://www.security-corp.org/advisories/SCSA-003-FR.txt
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Grégory Le Bras aka GaLiaRePt | http://www.Security-Corp.org
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