ET EXPLOIT Possible Citrix Application Delivery Controller Arbitrary Code Execution Attempt (CVE-2019-19781) M4

Query · suricata

flow:established,to_server;
http.uri;
content:"/vpns/"; nocase; fast_pattern;
http.uri.raw;
pcre:"/(?:(?:%2F|\/)(?:\.|%2E){2}(?:%2F|\/))/i";
Raw source ET EXPLOIT Possible Citrix Application Delivery Controller Arbitrary Code Execution Attempt (CVE-2019-19781) M4 · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http any any -> $HTTP_SERVERS any (
    msg:"ET EXPLOIT Possible Citrix Application Delivery Controller Arbitrary Code Execution Attempt (CVE-2019-19781) M4";
    flow:established,to_server;
    http.uri;
    content:"/vpns/"; nocase; fast_pattern;
    http.uri.raw;
    pcre:"/(?:(?:%2F|\/)(?:\.|%2E){2}(?:%2F|\/))/i";
    reference:url,support.citrix.com/article/CTX267679;
    reference:cve,2019-19781;
    classtype:attempted-admin;
    sid:2035109; rev:2;
    metadata:attack_target Server, created_at 2022_02_05, cve CVE_2019_19781, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence Medium, signature_severity Major, tag Exploit, tag CISA_KEV, updated_at 2022_02_05, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
)

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