ET WEB_SPECIFIC_APPS D-Link ipportFilter sip_address Parameter Buffer Overflow Attempt (CVE-2023-43240)

alert http any any -> $HOME_NET any (
    msg:"ET WEB_SPECIFIC_APPS D-Link ipportFilter sip_address Parameter Buffer Overflow Attempt (CVE-2023-43240)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri; bsize:20;
    content:"/goform/ipportFilter"; fast_pattern;
    http.request_body;
    content:"sip_address|3d|";
    pcre:"/^[^&]{100,}(?:&|$)/R";
    reference:url,github.com/peris-navince/founded-0-days/blob/main/Dlink/816/ipportFilter/1.md;
    reference:cve,2023-43240;
    classtype:web-application-attack;
    sid:2065138; rev:1;
    metadata:affected_product D_Link, attack_target Networking_Equipment, tls_state plaintext, created_at 2025_10_10, cve CVE_2023_43240, deployment Perimeter, deployment Internal, performance_impact Low, confidence High, signature_severity Major, tag Exploit, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_10_10, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
    target:dest_ip;
)