Host Header Injection

Support
1

Framework version 1.3, Studio version 1.5.

The app has a security issue “vulnerable to Host Header Injection”.

The security team suggests “avoid using the Host header altogether in server-side code”. I’m not sure what this is about, could you please help?

2

This question concerns Spring web applications in general.

According to this recommendation, you can define the following bean in your application to eliminate the possibility of Host Header Injection attacks:

@Bean
public WebSecurityCustomizer myWebSecurityCustomizer() {
    StrictHttpFirewall firewall = new StrictHttpFirewall();
    Set<String> hosts = Set.of("localhost", "myotherhost");
    firewall.setAllowedHostnames(hosts::contains);

    return web -> web.httpFirewall(firewall);
}