ET EXPLOIT [CORELIGHT] CrushFTP Auth Bypass Attempt (CVE-2025-31161)

alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET EXPLOIT [CORELIGHT] CrushFTP Auth Bypass Attempt (CVE-2025-31161)";
    flow:established,to_server;
    http.header;
    content:"authorization|3a 20|"; nocase;
    content:"|20|credential|3d|"; nocase;
    pcre:"/^[^\x7e\x2f\x0d\x0a]+\x2f/R";
    http.cookie;
    content:"CrushAuth|3d|"; fast_pattern;
    pcre:"/^[0-9]{13}_[a-zA-Z0-9]{26}/R";
    content:"currentAuth=";
    byte_extract:4,0,c2f,relative;
    http.request_body;
    content:"c2f|3d|";
    byte_test:4,=,c2f,0,relative;
    reference:url,github.com/Immersive-Labs-Sec/CVE-2025-31161/;
    reference:cve,2025-31161;
    classtype:attempted-admin;
    sid:2061619; rev:1;
    metadata:affected_product CrushFTP, attack_target Server, tls_state TLSDecrypt, created_at 2025_04_16, cve CVE_2025_31161, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, updated_at 2025_04_16, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
    target:dest_ip;
)