ET WEB_SPECIFIC_APPS Citrix NetScaler Console Authenticated Arbitrary File Read (CVE-2025-4365)

alert http any any -> $HOME_NET any (
    msg:"ET WEB_SPECIFIC_APPS Citrix NetScaler Console Authenticated Arbitrary File Read (CVE-2025-4365)";
    flow:established,to_server;
    http.uri;
    content:"/nitro/v1/download"; fast_pattern;
    http.header;
    content:"file|3a 20|"; nocase;
    content:"authorization|3a 20|"; nocase;
    http.method;
    content:"GET";
    reference:url,www.rapid7.com/blog/post/cve-2025-4365-cve-unassigned-netscaler-console-sdx-authenticated-arbitrary-file-read-write-fixed/;
    reference:cve,2025-4365;
    classtype:web-application-attack;
    sid:2067198; rev:1;
    metadata:affected_product Netscaler, attack_target Server, tls_state TLSDecrypt, created_at 2026_01_30, cve CVE_2025_4365, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, updated_at 2026_01_30, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
    target:dest_ip;
)