ET WEB_SPECIFIC_APPS Roundcube Post-Auth RCE via PHP Object Deserialization (CVE-2025-49113)

alert http any any -> $HOME_NET any (
    msg:"ET WEB_SPECIFIC_APPS Roundcube Post-Auth RCE via PHP Object Deserialization (CVE-2025-49113)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"action|3d|upload"; fast_pattern;
    content:"_from|3d|";
    pcre:"/^[^\x26]*?(?:%[cC]\d)?a-zA-Z?(?:\x3a|%3[aA])(?:(?:%[cC]\d)?\x2b)?(?:(?:%[cC]\d)?\d)+(?:%[cC]\d)?(?:\x3a|%3[aA])(?:(?:(?:%[cC]\d)?[a-zA-Z])?(?:%[cC]\d)?(?:\x3a|%3[aA])(?:(?:%[cC]\d)?\d)+(?:(?:%[cC]\d)?(?:\x3a|%3[aA]))?(?:(?:%[cC]\d)?(?:\x7b|%7[bB]))?|(?:%[cC]\d)?(?:\x22|%22)(?:(?![\x22\x3b\x7b\x7d]|%22|%[37][bB]|%7[dD]).)*(?:%[cC]\d)?(?:\x22|%22)|(?:%[cC]\d)?(?:\x3b|%3[bB])|(?:%[cC]\d)?(?:\x7d|%7[dD]))+/R";
    http.request_body;
    content:"filename|3d 22|";
    pcre:"/^[^\x22]*?preferences_time\x7cb\x3a\d+\x3b/R";
    reference:url,fearsoff.org/research/roundcube;
    reference:cve,2025-49113;
    classtype:web-application-attack;
    sid:2063428; rev:2;
    metadata:affected_product Roundcube, attack_target Server, created_at 2025_07_14, cve CVE_2025_49113, deployment Perimeter, deployment Internal, confidence High, signature_severity Major, tag Exploit, updated_at 2026_07_14, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
    target:dest_ip;
)