ET EXPLOIT Possible Realtek SDK - Stack Buffer Overflow via UPnP SUBSCRIBE Callback Header Inbound (CVE-2021-35393)

Query · suricata

flow:established,to_server;
http.method;
content:"SUBSCRIBE";
http.uri;
content:"/upnp/";
http.header;
content:"Callback|3a 20 3c|http"; fast_pattern;
pcre:"/^Callback\x3a\x20\x3chttp[^\x3a]+\x3a\d{1,5}[^\/]/Hmi";
Raw source ET EXPLOIT Possible Realtek SDK - Stack Buffer Overflow via UPnP SUBSCRIBE Callback Header Inbound (CVE-2021-35393) · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http any any -> [$HOME_NET,$HTTP_SERVERS] any (
    msg:"ET EXPLOIT Possible Realtek SDK - Stack Buffer Overflow via UPnP SUBSCRIBE Callback Header Inbound (CVE-2021-35393)";
    flow:established,to_server;
    http.method;
    content:"SUBSCRIBE";
    http.uri;
    content:"/upnp/";
    http.header;
    content:"Callback|3a 20 3c|http"; fast_pattern;
    pcre:"/^Callback\x3a\x20\x3chttp[^\x3a]+\x3a\d{1,5}[^\/]/Hmi";
    reference:url,www.iot-inspector.com/blog/advisory-multiple-issues-realtek-sdk-iot-supply-chain/;
    reference:cve,2021-35393;
    classtype:attempted-user;
    sid:2033843; rev:1;
    metadata:attack_target Server, created_at 2021_08_30, cve CVE_2021_35393, deployment Perimeter, deployment Internal, confidence Medium, signature_severity Major, tag Exploit, updated_at 2021_08_30, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
)

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