The realm of Network security encompasses many perspectives and interests as is evident from the wealth of articles prevalent across the media and availability of various proactive protection measures. One particular technology recognized as integral to securing a network is the Intrusion Prevention System (IPS), which is used to detect and prevent suspected malicious network traffic or behavior. However, an IPS is not just a ‘set-it-and-forget-it’ type of solution. This is because of the necessity of employing current Cisco IPS signatures, which are the lifeblood of the IPS and are essential for it to identify and block attacks against specific vulnerabilities or certain types of threats. Because new threats and vulnerabilities are constantly being discovered, the IPS signature database for an IPS-capable device needs to be kept current to maximize the level of protection that it can provide. If you already use Cisco IPS technology, then you might already be familiar how crucial it is to use the most current IPS signatures. Otherwise, the IPS solution cannot provide optimal protection against new threats and attacks. Cisco IPS owners with a Cisco IPS Services License understand this fact and can receive signature updates as they become available. Signature updates can be installed manually or downloaded and installed automatically using native Cisco IPS capabilities or management tools such as Cisco Security Manager. For those inclined to write their own signatures, Cisco has published documentation on how to write customer signatures for the IPS.
And while the signatures are the “lifeblood” of the IPS and keeping them current is paramount, it is also important to make sure that the underlying operating system is kept up to date on the sensor as well. The underlying operating system and engines decompose and analyze the traffic as it passes through the device. Things like protocol decoding, features, and evasion resistance are handled here. The engines work but do not alert without the signature set as the signatures provide the matching framework for an alert to fire. The same can be said about the signatures. They do not work without the engines. Each requires the other to function and therefore keeping them both current is important.