ET EXPLOIT Fortinet FortiOS/FortiProxy SSL VPN Web Portal Path Traversal (CVE-2018-13379)

alert http any any -> [$HOME_NET,$HTTP_SERVERS] any (
    msg:"ET EXPLOIT Fortinet FortiOS/FortiProxy SSL VPN Web Portal Path Traversal (CVE-2018-13379)";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/fgt_lang?lang="; fast_pattern;
    content:"|2e 2e 2f|"; distance:0;
    reference:url,devco.re/blog/2019/08/09/attacking-ssl-vpn-part-2-breaking-the-Fortigate-ssl-vpn/;
    reference:url,github.com/milo2012/CVE-2018-13379/blob/master/CVE-2018-13379.py;
    reference:cve,2018-13379;
    classtype:attempted-admin;
    sid:2034005; rev:1;
    metadata:affected_product Fortigate, created_at 2021_09_22, cve CVE_2018_13379, deployment Perimeter, deployment Internal, confidence High, signature_severity Major, tag CISA_KEV, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_09_22, mitre_tactic_id TA0007, mitre_tactic_name Discovery, mitre_technique_id T1083, mitre_technique_name File_And_Directory_Discovery;
    target:dest_ip;
)