Are there any specific PHP functions or libraries that can help sanitize and validate User-Agent and Referer headers to mitigate SQL injection risks?

User-Agent and Referer headers can be manipulated by attackers to inject malicious SQL queries, leading to SQL injection vulnerabilities in your application. To mitigate this risk, you can use PHP functions like filter_input() with the FILTER_SANITIZE_STRING filter to sanitize the headers and prevent any malicious input from being processed by your application. 

$user_agent = filter_input(INPUT_SERVER, 'HTTP_USER_AGENT', FILTER_SANITIZE_STRING);
$referer = filter_input(INPUT_SERVER, 'HTTP_REFERER', FILTER_SANITIZE_STRING);

Keywords

PHP functions libraries sanitize validate SQL injection

Related Questions