# Interesting HTTP

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## Referrer headers and policy Referrer is the header used by browsers to indicate which was the previous page visited. ### Sensitive information leaked If at some point inside a web page any sensitive information is located on a GET request parameters, if the page contains links to external sources or an attacker is able to make/suggest (social engineering) the user visit a URL controlled by the attacker. It could be able to exfiltrate the sensitive information inside the latest GET request. ### Mitigation You can make the browser follow a **Referrer-policy** that could **avoid** the sensitive information to be sent to other web applications: ``` Referrer-Policy: no-referrer Referrer-Policy: no-referrer-when-downgrade Referrer-Policy: origin Referrer-Policy: origin-when-cross-origin Referrer-Policy: same-origin Referrer-Policy: strict-origin Referrer-Policy: strict-origin-when-cross-origin Referrer-Policy: unsafe-url ``` ### Counter-Mitigation You can override this rule using an HTML meta tag (the attacker needs to exploit and HTML injection): ```markup

``` ### Defense Never put any sensitive data inside GET parameters or paths in the URL.

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