alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET INFO Referrer-Policy set to unsafe-url"; flow:established,to_client; http.response_header; content:"referrer-policy|3a 20|unsafe-url"; nocase; reference:url,w3.org/TR/referrer-policy/#referrer-policy-unsafe-url; reference:url,developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Referrer-Policy#unsafe-url; reference:url,wanago.io/2022/03/28/referer-header-referrer-policy; classtype:bad-unknown; sid:2054422; rev:1; metadata:attack_target Client_Endpoint, created_at 2024_07_09, deployment Perimeter, confidence High, signature_severity Informational, updated_at 2024_07_09;)