ET WEB_SPECIFIC_APPS ASUS RT-AC3200 Uncontrolled Format String via nvram_match Hook Family in appGet.cgi (CVE-2018-14713)

alert http any any -> $HOME_NET any (
    msg:"ET WEB_SPECIFIC_APPS ASUS RT-AC3200 Uncontrolled Format String via nvram_match Hook Family in appGet.cgi (CVE-2018-14713)";
    flow:established,to_server;
    http.uri;
    content:"/appGet.cgi"; startswith;
    content:"hook|3d|nvram_match"; fast_pattern;
    pcre:"/^[^\x29]*?\x22[^\x22]*?(?:\x25(?:(?:d|ul?|x|s|c|h?(?:n|p))|\d|\x2a|\x2e|\x5c?\x24)+)+/R";
    reference:url,blog.securityevaluators.com/asus-routers-overflow-with-vulnerabilities-b111bc1c8eb8;
    reference:cve,2018-14713;
    classtype:web-application-attack;
    sid:2064928; rev:1;
    metadata:affected_product Asus, attack_target Networking_Equipment, created_at 2025_09_25, cve CVE_2018_14713, deployment Perimeter, deployment Internal, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_09_25;
    target:dest_ip;
)