ET EXPLOIT Possible Citrix Authentication Bypass Attempt Inbound (CVE-2020-8193)

alert http any any -> [$HOME_NET,$HTTP_SERVERS] any (
    msg:"ET EXPLOIT Possible Citrix Authentication Bypass Attempt Inbound (CVE-2020-8193)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"&sid=loginchallenge";
    content:"&username=nsroot"; distance:0; fast_pattern;
    http.request_body;
    content:"<appfwprofile"; startswith;
    reference:url,research.nccgroup.com/2020/07/10/rift-citrix-adc-vulnerabilities-cve-2020-8193-cve-2020-8195-and-cve-2020-8196-intelligence/;
    reference:cve,2020-8193;
    classtype:attempted-admin;
    sid:2031067; rev:2;
    metadata:created_at 2020_10_21, cve CVE_2020_8193, deployment Perimeter, deployment Internal, confidence High, signature_severity Major, tag CISA_KEV, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_11_26, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
    target:dest_ip;
)