full-disclosure - Secunia Research: cPanel Entropy Chat Script Insertion Vulnerability

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Date: Fri Nov  4 21:22:47 2005
From: vuln at secunia.com (Secunia Research)
Subject: Secunia Research: cPanel Entropy Chat Script
	Insertion Vulnerability

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                     Secunia Research 04/11/2005

         - cPanel Entropy Chat Script Insertion Vulnerability -

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Table of Contents

Affected Software....................................................1
Severity.............................................................2
Vendor's Description of Software.....................................3
Description of Vulnerability.........................................4
Solution.............................................................5
Time Table...........................................................6
Credits..............................................................7
About Secunia........................................................8
Verification.........................................................9

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1) Affected Software

cPanel 10.2.0-R82 and 10.6.0-R137

Other versions may also be affected.

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2) Severity

Rating: Moderately critical
Impact: Cross-site scripting
Where:  Remote

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3) Vendor's Description of Software

cPanel & WebHost Manager (WHM) is a next generation web hosting 
control panel system. Both cPanel & WHM are extremely feature rich as 
well as include an easy to use web based interface (GUI).

Product link:
http://www.cpanel.net/

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4) Description of Vulnerability

Secunia Research has discovered a vulnerability in cPanel, which can 
be exploited by malicious people to conduct script insertion attacks.

Input passed to the chat message field in the pre-installed 
Entropy Chat script isn't properly sanitised before being used. This 
can be exploited to inject arbitrary script code, which will be 
executed in a user's browser session in context of an affected site 
when the malicious user data is viewed with the 
Microsoft Internet Explorer browser.

Example:
Send message <b style="width:expression([code])">text</b> 
via http://[host]:2084/

The vulnerability has been confirmed in versions 10.2.0-R82 and 
10.6.0-R137. Other versions may also be affected.

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5) Solution

Edit the source code to ensure that input is properly sanitised.

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6) Time Table

10/10/2005 - Vulnerability discovered.
14/10/2005 - Vendor notified.
04/11/2005 - Public disclosure.

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7) Credits

Discovered by Andreas Sandblad, Secunia Research.

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8) About Secunia

Secunia collects, validates, assesses, and writes advisories regarding
all the latest software vulnerabilities disclosed to the public. These
advisories are gathered in a publicly available database at the
Secunia website:

http://secunia.com/

Secunia offers services to our customers enabling them to receive all
relevant vulnerability information to their specific system
configuration.

Secunia offers a FREE mailing list called Secunia Security Advisories:

http://secunia.com/secunia_security_advisories/

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9) Verification

Please verify this advisory by visiting the Secunia website:
http://secunia.com/secunia_research/2005-56/advisory/

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