Summary
Acunetix 360 identified that HTTP Strict Transport Security (HSTS) policy is not enabled.
The target website is being served from not only HTTPS but also HTTP and it lacks of HSTS policy implementation.
HTTP Strict Transport Security (HSTS) is a web security policy mechanism whereby a web server declares that complying user agents (such as a web browser) are to interact with it using only secure (HTTPS) connections. The HSTS Policy is communicated by the server to the user agent via a HTTP response header field named "Strict-Transport-Security". HSTS Policy specifies a period of time during which the user agent shall access the server in only secure fashion.
- Automatically turn any insecure (HTTP) links referencing the web application into secure (HTTPS) links. (For instance, http://example.com/some/page/ will be modified to https://example.com/some/page/ before accessing the server.)
- If the security of the connection cannot be ensured (e.g. the server's TLS certificate is self-signed), user agents show an error message and do not allow the user to access the web application.
Remediation
Configure your webserver to redirect HTTP requests to HTTPS.
i.e. for Apache, you should have modification in the httpd.conf. For more configurations, please refer to External References section.
# load module
LoadModule headers_module modules/mod_headers.so
# redirect all HTTP to HTTPS (optional)
<VirtualHost *:80>
ServerAlias *
RewriteEngine On
RewriteRule ^(.*)$ https://%{HTTP_HOST}$1 [redirect=301]
</VirtualHost>
# HTTPS-Host-Configuration
<VirtualHost *:443>
# Use HTTP Strict Transport Security to force client to use secure connections only
Header always set Strict-Transport-Security "max-age=31536000; includeSubDomains"
# Further Configuration goes here
[...]
</VirtualHost>