Wordpress Tera Charts Multiple Directory Traversal Vulnerability

Summary
This host is installed with Wordpress Tera Charts and is prone to multiple directory traversal vulnerability.
Impact
Successful exploitation will allow remote attackers to download arbitrary files. Impact Level: Application
Solution
Upgrade to version 1.0 or higher, For updates refer https://wordpress.org/plugins/tera-charts
Insight
Flaw is due to the 'charts/treemap.php' and 'charts/zoomabletreemap.php' scripts are not properly sanitizing user input, specifically path traversal style attacks (e.g. '../') via the 'fn' parameter.
Affected
Wordpress Tera Charts plugin version 0.1
Detection
Send a crafted data via HTTP GET request and check whether it is able to read arbitrary files or not.
References