VRT Guide To IDS Ruleset Tuning
Summary: Cisco Talos's Vulnerability Research Team published a guide on tuning IDS rulesets, warning that enabling all VRT Certified Rules is a bad idea, especially in IPS mode where dropped packets can cause harm. The guide notes that advisory rules like SID 11968 ("VOIP-SIP inbound INVITE message") could take down a phone system if blindly enabled, and that Sourcefire added the "metadata" keyword in January 2006 to group rules into three default policies: Connectivity Over Security, Balanced, and Security Over Connectivity.
Why it matters: The VRT states plainly that more rules do not mean better protection, and that MSSPs in particular can cause a world of hurt by assuming otherwise - a single advisory rule enabled on a production network can take down an entire phone system.
Read the original at Cisco Talos ↗
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