ET EXPLOIT IE MSHTML Out-of-Bounds Write Inbound (CVE-2021-33742)

Query · suricata

flow:from_server,established;
file.data;
content:"innerHTML|20|=|20|Array|28|"; nocase; fast_pattern;
byte_test:0,>=,33554431,0,string,dec,relative;
content:"|29|.toString|28 29 3b|"; distance:0; within:50;
Raw source ET EXPLOIT IE MSHTML Out-of-Bounds Write Inbound (CVE-2021-33742) · Suricata
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Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET EXPLOIT IE MSHTML Out-of-Bounds Write Inbound (CVE-2021-33742)";
    flow:from_server,established;
    file.data;
    content:"innerHTML|20|=|20|Array|28|"; nocase; fast_pattern;
    byte_test:0,>=,33554431,0,string,dec,relative;
    content:"|29|.toString|28 29 3b|"; distance:0; within:50;
    reference:url,googleprojectzero.github.io/0days-in-the-wild/0day-RCAs/2021/CVE-2021-33742.html;
    reference:cve,2021-33742;
    classtype:attempted-admin;
    sid:2033326; rev:1;
    metadata:created_at 2021_07_15, cve CVE_2021_33742, confidence Medium, signature_severity Major, tag CISA_KEV, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_07_15;
)

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