Nids: False Positive Reduction Through Anomaly Detection

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Presented at Blackhat USA 2005 by

Emmanuele Bolzoni

The Achilles' heel of network IDSs lies in the large number of false positives (i.e., false attacks) that occur: practitioners as well as researchers observe that it is common for a NIDS to raise thousands of mostly false alerts per day. False positives are a universal problem as they affect both signature-based and anomaly-based IDSs. Finally, attackers can overload IT personnel by forging ad-hoc packets to produce false alerts, thereby lowering the defences of the IT infrastructure.