IPS Signatures

DNS Flood Attack

 
Signature ID: 4004/0
Original Release:S343
Release:S520 (download)
Original Release Date:2008 July 09
Latest Release Date:2010 October 16
Default Enabled:False
Default Retired:True
Alarm Severity:Medium
Fidelity:85 

Description

This signature detects a DNS flood that could lead to potential DNS cache poisoning, reflection, or amplification attacks.

Recommended Filter

Filter out alerts from servers that legitimately produce a large number of DNS queries.

Benign Triggers

Mail servers may generate a sufficient number of DNS queries to obtain MX records for sending emails. It is recommended to filter these alerts.

IntelliShield Alerts

IntelliShield ID Headline VersionCVSS ScoreLast Published
16183Multiple Vendor DNS Implementations Insufficient Entropy Vulnerability316.4/5.32009 December 09 16:37 GMT

Download

To download this and other IPS update files, please go to Cisco Secure Software Download.

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