Appendix B Signature Engines

Service Engines

Table B-21

Service H.225 Engine Parameters (continued)

 

 

 

 

 

Parameter

 

Description

Value

 

 

 

specify-regex-string {yes

Specifies the regular expression to look for when

string

no}

 

the policy type is Regex:

0 to 65535

 

 

 

 

 

• regex-string—Specifies a regular expression

 

 

 

to search for in a single TCP packet.

 

 

 

• (Optional)

 

 

 

specify-min-match-length—Enables

 

 

 

minimum match length for use:

 

 

 

– min-match-length—Specifies the

 

 

 

minimum length of the Regex match

 

 

 

required to constitute a match.

 

 

 

Note This is never set for TPKT signatures.

 

 

 

 

specify-value-range {yes

Enables value range for use:

0 to 655351

no}

 

• value-range—Specifies the range of values.

a-b

 

 

 

 

 

Note Valid for the length or value policy types

 

 

 

(0x00 to 6535). Not valid for other policy

 

 

 

types.

 

 

 

 

swap-attacker-victim

Swaps the attacker and victim addresses and ports

true false (default)

 

 

(source and destination) in the alert message and

 

 

 

in any actions taken.

 

 

 

 

 

1. The second number in the range must be greater than or equal to the first number.

For More Information

•For more information on the parameters common to all signature engines, see Master Engine, page B-4.

•For a list of the signature regular expression syntax, see Regular Expression Syntax, page B-9.

Service HTTP Engine

The Service HTTP engine is a service-specific string-based pattern-matching inspection engine. The HTTP protocol is one of the most commonly used in networks of today. In addition, it requires the most amount of preprocessing time and has the most number of signatures requiring inspection making it critical to the overall performance of the system.

The Service HTTP engine uses a Regex library that can combine multiple patterns into a single pattern-matching table allowing a single search through the data. This engine searches traffic directed only to web services, or HTTP requests. You cannot inspect return traffic with this engine. You can specify separate web ports of interest in each signature in this engine.

HTTP deobfuscation is the process of decoding an HTTP message by normalizing encoded characters to ASCII equivalent characters. It is also known as ASCII normalization.

 

Cisco Intrusion Prevention System Sensor CLI Configuration Guide for IPS 7.2

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Cisco Systems IPS4510K9 manual Service Http Engine, For More Information
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IPS4510K9 specifications

Cisco Systems has long been a leading player in network security, and its IPS (Intrusion Prevention System) series is a testament to its commitment to safeguarding digital environments. Among its notable offerings are the IPS4510K9 and IPS4520K9 models, both designed to provide advanced threat protection for mid-sized to large enterprise networks.

The Cisco IPS4510K9 and IPS4520K9 are distinguished by their cutting-edge features that help organizations defend against a myriad of cyber threats. These systems utilize a multi-layered approach to security, integrating intrusion prevention, advanced malware protection, and comprehensive visibility across the network.

One of the primary characteristics of the IPS4510K9 is its high performance. It boasts a throughput of up to 1 Gbps, making it suitable for environments that demand rapid data processing and real-time responses to threats. The IPS4520K9, on the other hand, enhances that capability with improved throughput of up to 2 Gbps, accommodating larger enterprises with heavier network traffic. These models are equipped with powerful processors that support complex signature matching and can intelligently distinguish between legitimate traffic and potential threats.

In addition to performance, both models are designed with scalability in mind. They can be easily integrated into existing Cisco infrastructures. This facilitates a seamless enhancement of security without causing significant interruptions to ongoing operations. Moreover, they offer flexible deployment options, allowing organizations to operate them inline or out of band depending on their specific needs.

The Cisco IPS4510K9 and IPS4520K9 leverage advanced detection technologies, utilizing a variety of signature types and heuristic analysis to detect known and unknown threats effectively. They are equipped with real-time alerting and reporting capabilities, giving security teams immediate visibility into potential breaches and enabling them to respond swiftly.

Furthermore, both models support a range of management options through the Cisco Security Manager, allowing for centralized administration, streamlined policy management, and enhanced monitoring capabilities. Automated updates ensure the systems remain current with the latest threat intelligence, vital for staying ahead of evolving cyber threats.

In summary, the Cisco Systems IPS4510K9 and IPS4520K9 represent powerful solutions for organizations seeking robust intrusion prevention capabilities. With their high performance, scalability, and advanced detection technologies, these systems are essential tools in the ever-changing landscape of cybersecurity, providing enterprises with the peace of mind needed to operate securely in today's digital world.
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