ET HUNTING - DNS Response containing multiple DNSSEC RRSIG Entries (Algorithm 14) - Possible CVE-2023-50387 Activity

Query · suricata

content:"|84 90|"; offset:4;
content:"|00 2e 00 01|"; fast_pattern;
content:"|0e|"; distance:8; within:9;
content:"|00 2e 00 01|"; distance:0;
content:"|0e|"; distance:8; within:9;
content:"|00 2e 00 01|"; distance:0;
content:"|0e|"; distance:8; within:9;
content:"|00 2e 00 01|"; distance:0;
content:"|0e|"; distance:8; within:9;
Raw source ET HUNTING - DNS Response containing multiple DNSSEC RRSIG Entries (Algorithm 14) - Possible CVE-2023-50387 Activity · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert tcp any 53 -> $HOME_NET any (
    msg:"ET HUNTING - DNS Response containing multiple DNSSEC RRSIG Entries (Algorithm 14) - Possible CVE-2023-50387 Activity";
    content:"|84 90|"; offset:4;
    content:"|00 2e 00 01|"; fast_pattern;
    content:"|0e|"; distance:8; within:9;
    content:"|00 2e 00 01|"; distance:0;
    content:"|0e|"; distance:8; within:9;
    content:"|00 2e 00 01|"; distance:0;
    content:"|0e|"; distance:8; within:9;
    content:"|00 2e 00 01|"; distance:0;
    content:"|0e|"; distance:8; within:9;
    reference:cve,2023-50387;
    reference:url,github.com/knqyf263/CVE-2023-50387;
    classtype:denial-of-service;
    sid:2050979; rev:1;
    metadata:affected_product Any, attack_target DNS_Server, created_at 2024_02_20, cve CVE_2023_50387, deployment Perimeter, deployment Internal, performance_impact Moderate, confidence Low, signature_severity Major, updated_at 2024_02_20;
)

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