[SCSA-003] Multiple Cross Site Scripting & Script Injection Vulnerabilities in Nuked-Klan

2003-01-28T00:00:00
ID SECURITYVULNS:DOC:4026
Type securityvulns
Reporter Securityvulns
Modified 2003-01-28T00:00:00

Description

.: 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


Grégory Le Bras aka GaLiaRePt | http://www.Security-Corp.org