vTiger CRM 5.2.x | PHP Version Disclosure

How do attackers try to know PHP version if the server has disabled "X-Powered-By" header (i.e expose_php = Off)? 

The vTiger CRM has a flaw that allows attackers to know exact PHP version without authentication.

 Attacker can know it by simply visiting the following url without authentication.


 The message shows:
"PHP 5.0.x or above is required. Your current PHP version is 5.3
Kindly upgrade the PHP installation, any try again! "

Version Affected:

Tested on vTiger CRM 5.2.1 

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