ET WEB_SPECIFIC_APPS CrushFTP WebInterface Alternative Channel Authentication Bypass (CVE-2025-54309) M1

alert http any any -> $HOME_NET any (
    msg:"ET WEB_SPECIFIC_APPS CrushFTP WebInterface Alternative Channel Authentication Bypass (CVE-2025-54309) M1";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"/WebInterface/function/"; fast_pattern;
    http.header;
    content:"as2-to"; nocase;
    pcre:"/^[^\x0d\x0a]*?\x5ccrushadmin/R";
    http.request_body;
    content:"command|3d|setUserItem";
    reference:url,reliaquest.com/blog/threat-spotlight-cve-2025-54309-crushftp-exploit/;
    reference:cve,2025-54309;
    classtype:attempted-admin;
    sid:2064043; rev:2;
    metadata:affected_product CrushFTP, attack_target Server, tls_state TLSDecrypt, created_at 2025_08_19, cve CVE_2025_54309, deployment Perimeter, deployment Internal, confidence Medium, signature_severity Major, tag Exploit, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_08_27, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
    target:dest_ip;
)