In this paper, the authors' explore the technical basis behind a virtual patch, also known as a virtual software patch, a function provided by high-performance Intrusion Prevention Systems (IPS). A virtual software patch is a powerful frontline defense against compromise that can be deployed in minutes to protect an entire organization. The virtual patch capability relies on a special type of IPS filter called a "vulnerability" or "vulnerability-based" filter. Vulnerability filters precisely block attempts to exploit a particular software flaw, while allowing non-attack traffic to pass unhindered.
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