alert http $EXTERNAL_NET any -> $HOME_NET 4081 (msg:"ET WEB_SPECIFIC_APPS Kerio Control CRLF Injection via dest Parameter (CVE-2024-52875)"; flow:established,to_server; http.uri; content:"/nonauth/"; startswith; fast_pattern; content:".cs?"; distance:0; content:"dest|3d|"; distance:0; pcre:"/^[\S]*?(?:(?:Cg|DQ)|[NK][CD]|[o0][NK])/R"; reference:url,karmainsecurity.com/hacking-kerio-control-via-cve-2024-52875; reference:cve,2024-52875; classtype:web-application-activity; sid:2059029; rev:1; metadata:attack_target Server, tls_state TLSDecrypt, created_at 2025_01_08, cve CVE_2024_52875, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, updated_at 2025_01_08, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)