ET WEB_SPECIFIC_APPS Synology Driver Server CRLF Injection (CVE-2024-50629)

alert http any any -> $HOME_NET any (
    msg:"ET WEB_SPECIFIC_APPS Synology Driver Server CRLF Injection (CVE-2024-50629)";
    flow:established,to_server;
    http.uri;
    content:"/webapi/entry.cgi"; startswith;
    http.request_body;
    content:"api|3d|SYNO.API.Auth.RedirectURI"; fast_pattern;
    content:"redirect_url|3d|";
    pcre:"/^[^&]*?\x25(?:25)?0[dD]\x25(?:25)?0[aA]/R";
    reference:url,kiddo-pwn.github.io/blog/2025-11-30/writing-sync-popping-cron;
    reference:cve,2024-50629;
    classtype:web-application-attack;
    sid:2066036; rev:1;
    metadata:affected_product Synology, attack_target Server, tls_state TLSDecrypt, created_at 2025_12_05, cve CVE_2024_50629, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, updated_at 2025_12_05, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
    target:dest_ip;
)