IPS version 7.0.1 and global correlation

Tomorrow night I will be moving an appliance IPS-4240 to the new version 7.0.1. Global correlation seems to be a huge advantage as long as it does not produce a swarm of false positives.

Will there be still necessary to apply updates the signature on the IPS, once we are on the new 7.0.1?

Global correlation is not a replacement for traditional signature analysis and is rather just an improvement for her.

There are 2 aspects to overall correlation.

The first is what we call reputation internally. IP address known to be the origin of the attacks receive a Score of negative reputation.

When a signature is triggered, the source of the signature is compared to the reputation database. If the source address has a negative reputation score then the level of risk so that an alert is increased. With the increased risk, the sensor can take a decision to move forward and to deny traffic.

BUT because it is based on this initial release of the signature, this means that you should always keep your signatures up-to-date.

The second part of overall correlation is the reputation filter.

With the offender the worst reputation filter Internet IP addresses are placed in a special list.

The worst offense addresses IP is automatically filtered to the sensor without the need of a signature never triggered. These packages are refused by the sensor for early treatment and works in a similar way as the event action deny attacking InLine.

So the reputation filter didn't need signatures in order to work properly and deny traffic. However, the reputation filter is only for the worst known IP addresses and only a small subset of the strikers in liquidation in the reputation filter list.

Tags: Cisco Security

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