alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET EXPLOIT FortiOS SSL VPN - Improper Authorization Vulnerability (CVE-2018-13382)"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/remote/logincheck"; depth:18; fast_pattern; endswith; http.request_body; content:"ajax=1"; content:"&username="; content:"&credential="; content:"&magic="; reference:cve,CVE-2018-13382; reference:url,github.com/milo2012/CVE-2018-13382/blob/master/CVE-2018-13382.py; reference:url,blog.orange.tw/2019/08/attacking-ssl-vpn-part-2-breaking-the-fortigate-ssl-vpn.html; classtype:attempted-admin; sid:2027885; rev:4; metadata:affected_product Fortigate, attack_target Networking_Equipment, created_at 2019_08_14, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, signature_severity Critical, tag CISA_KEV, updated_at 2020_09_17;)