full-disclosure - cPanel hardlink chown issue

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Message-ID: <41739206.7080206@drumnbass.art.pl>
From: appelast at drumnbass.art.pl (Karol Więsek)
Subject: cPanel hardlink chown issue

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Name:			cPanel
Vendor URL:		http://www.cpanel.net
Author: 		Karol Wi?sek <appelast@...mnbass.art.pl>
Date: 			July 31, 2004

Issue:
cPanel allows logged in users to change ownership of any file to their
uid:gid.

Description:
cPanel is a next generation web hosting control panel system. cPanel is
extremely feature rich as well as include an easy to use web based
interface (GUI). cPanel is designed for the end users of your system and
allows them to control everything from adding / removing email accounts
to administering MySQL databases.

Details:
cPanel allows users to turn on/off front fage extensions. It is done
with effective uid of system administrator ( root ). During this process
is created special .htaccess file, and then it is chown() to target
user. Attacker could link .htaccess to any file in the same partition,
thus it will be chown()ed.

Exploit:
To exploit this vulnerability just link file you want to grab to
.htaccess in users public_html, and execute installation of frontpage
extensions.

Tested on cPanel 9.4.1-RELEASE-64, and confirmed vulnerable.

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