WordPress Ad Widget 2.10.0 Local File Inclusion

`  
A A A A A A A A A A A A A DefenseCode ThunderScan SAST Advisory  
A A A A A A A A WordPress Ad Widget Plugin Local File Inclusion  
A A A A A A A A A A A A A A A A A A A A Security Vulnerability  
  
  
Advisory ID:A A A DC-2017-01-001  
Advisory Title: WordPress Ad Widget Plugin Local file Inclusion  
A Security Vulnerability  
Advisory URL:A A http://www.defensecode.com/advisories.php  
Software:A A A A A A WordPress Ad Widget plugin  
Language:A A A A A A PHP  
Version:A A A A A A A 2.10.0 and below  
Vendor Status:A Vendor contacted, update released  
Release Date:A A 2017/10/10  
Risk:A A A A A A A A A A Medium  
  
  
  
1. General Overview  
===================  
During the security audit of Ad Widget plugin for WordPress CMS,  
security vulnerability was discovered using DefenseCode ThunderScan  
application source code security analysis platform.  
  
More information about ThunderScan is available at URL:  
http://www.defensecode.com  
  
  
2. Software Overview  
====================  
According to the plugin developers, Ad Widget enables it's users to  
easily upload ad images and ad code to their sidebar, for those that  
don't need or want a complicated ad management system.  
  
According to wordpress.org, it has more than 30,000 active installs.  
  
Homepage:  
https://wordpress.org/plugins/ad-widget/  
https://github.com/broadstreetads/wordpress-ad-widget  
http://broadstreetads.com/about/contact/  
A A A A A A A   
  
3. Vulnerability Description  
============================  
During the security analysis, ThunderScan discovered Local File  
Inclusion vulnerability in WP Ad Widget plugin. By requesting a  
specially crafted URL, the attacker can cause remote server to execute  
a php file of his choosing. Although the user requesting the URL has  
to be logged into the WordPress administrative console, the attacker  
can cause the administrator to request such a URL by using various  
social engineering/phishing approaches. Specified file will be  
interpreted by php interpreter, and any valid php code will indeed be  
executed. If the php installation on server has "allow_url_include=1"  
configuration option set, this attack can be expanded to execute a php  
file from any remote URL. If the php version is less than 5.3.4, the  
".php" that gets appended to the end of the file name attacker chose  
can be omitted by adding a null character ("%00") to the requested  
URL, and enable the attacker to execute any file, regardless of the  
extension.  
  
3.1. Local File Inclusion  
A File:A A A A A A ad-widget\views\modal\index.php  
A Fucntion:A A require "$page.php";  
A Variable:A A $_GET['step'];  
A Sample URL:  
http://vulnerablesite.com/wp-content/plugins/ad-widget/views/modal/?step=../../../../../../../etc/passwd%00  
A File: ad-widget\views\modal\index.php  
A A A ---------  
A A A 38A $page = @$_GET['step'];  
A A A ...  
A A A 68A require "$page.php";  
A A A ---------  
A   
  
4. Solution  
===========  
Vendor thanked us and notified us the security issue was fixed after  
we reported it. All users are strongly advised to update WordPress  
Ad Widget plugin to the latest available version.  
  
  
5. Credits  
==========  
Discovered by Neven Biruski using DefenseCode ThunderScan source code  
security analyzer.  
  
A   
6. Disclosure Timeline  
======================  
2017/03/28A A A A A Vendor contacted  
2017/04/04A A A A A Vendor responded  
2017/04/04A A A A A Update released  
2017/10/10A A A A A Advisory released to the public  
  
  
7. About DefenseCode  
====================  
DefenseCode L.L.C. delivers products and services designed to analyze  
and test web, desktop and mobile applications for security  
vulnerabilities.  
  
DefenseCode ThunderScan is a SAST (Static Application Security  
Testing, WhiteBox Testing) solution for performing extensive security  
audits of application source code. ThunderScan SAST performs fast and  
accurate analyses of large and complex source code projects delivering  
precise results and low false positive rate.  
  
DefenseCode WebScanner is a DAST (Dynamic Application Security  
Testing, BlackBox Testing) solution for comprehensive security audits  
of active web applications. WebScanner will test a website's security  
by carrying out a large number of attacks using the most advanced  
techniques, just as a real attacker would.  
  
Subscribe for free software trial on our website  
http://www.defensecode.com/ .  
  
E-mail: defensecode[at]defensecode.com  
  
Website: http://www.defensecode.com  
Twitter: https://twitter.com/DefenseCode/  
  
  
  
`