ET EXPLOIT FortiOS SSL VPN - Pre-Auth Messages Payload Buffer Overflow (CVE-2018-13381)

Query · suricata

flow:established,to_server;
http.request_body;
content:"&msg=%26%23%3c"; fast_pattern; nocase;
pcre:"/(?:\%3C){1000}/Ri";
http.start;
content:"POST /message HTTP/1.1";
Raw source ET EXPLOIT FortiOS SSL VPN - Pre-Auth Messages Payload Buffer Overflow (CVE-2018-13381) · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET EXPLOIT FortiOS SSL VPN - Pre-Auth Messages Payload Buffer Overflow (CVE-2018-13381)";
    flow:established,to_server;
    http.request_body;
    content:"&msg=%26%23%3c"; fast_pattern; nocase;
    pcre:"/(?:\%3C){1000}/Ri";
    http.start;
    content:"POST /message HTTP/1.1";
    reference:cve,CVE-2018-13381;
    reference:url,blog.orange.tw/2019/08/attacking-ssl-vpn-part-2-breaking-the-fortigate-ssl-vpn.html;
    classtype:attempted-admin;
    sid:2027884; rev:3;
    metadata:affected_product Fortigate, attack_target Networking_Equipment, created_at 2019_08_14, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence High, signature_severity Major, updated_at 2020_08_31;
)

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