ET WEB_SPECIFIC_APPS CrushFTP working_dir Template Injection Attempt (CVE-2024-4040)

alert http any any -> $HOME_NET any (
    msg:"ET WEB_SPECIFIC_APPS CrushFTP working_dir Template Injection Attempt (CVE-2024-4040)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"/WebInterface/function/?command|3d|"; fast_pattern; startswith;
    content:"c2f|3d|";
    content:"path|3d 7b|working_dir|7d|";
    content:"names|3d|";
    http.cookie;
    content:"CrushAuth|3d|";
    content:"c2f|3d|"; distance:0;
    reference:cve,2024-4040;
    reference:url,attackerkb.com/topics/20oYjlmfXa/cve-2024-4040/rapid7-analysis;
    classtype:attempted-recon;
    sid:2052277; rev:1;
    metadata:affected_product CrushFTP, attack_target FTP_Server, tls_state TLSDecrypt, created_at 2024_04_26, cve CVE_2024_4040, deployment Perimeter, deployment Internal, deployment SSLDecrypt, performance_impact Low, confidence High, signature_severity Major, tag CISA_KEV, updated_at 2024_04_26, mitre_tactic_id TA0009, mitre_tactic_name Collection, mitre_technique_id T1005, mitre_technique_name Data_from_local_system;
    target:dest_ip;
)