Network Security Portable Reference
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When enabled, this feature maintains a two-week history of the previously listed host status changes which are maintained for every host registered with the MC. Under the Network Status section, click No next to host history collection enabled and then click Enable in the popup window. This list contains the digital certificates of the trusted systems used by the Cisco IPS to establish secure connections.
In the process of adding the system, the Cisco IPS retrieves the digital certificate of the CSA-MC and displays its fingerprint—which is then presented to the administrator for approval. After the administrator approves the associated fingerprint, the CSA-MC system is added as a trusted host. Cisco IPS sensors are equipped with an external product interface designed to handle communications with external security and management products such as the CSA-MC. CSA-MC is the only external product supported at this time. The following describe all the relevant parameters configured in the external product interface:.
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Default port is Communication is always protected with TLS, this parameter cannot be changed. It also defines the values in which risk rating should be increased. Configuration is described in the next section. This information extends the endpoint visibility of the Cisco IPS, helping it make smarter decisions and consequently reducing the chances for false-positives.
A false-positive is an event where the Cisco IPS triggers an alarm in response to an activity that is actually not malicious, or where the Cisco IPS triggers a response action that is out of proportion. The problem of false-positives often occurs when the Cisco IPS fails to interpret the risk level associated with the network event in question—typically due to the lack of context information.
By using the OS type information provided by CSA, the Cisco IPS can better determine the appropriate relative risk associated with a particular event, thereby reducing the possibility of a false positive. Under this mechanism, each Cisco IPS alarm is quantified with a numerical value between 0 and , called risk rating , which gives the user an idea of the relative risk associated with the event triggering the alarm.
In practice, risk rating is used to either highlight events that require immediate attention when the sensor is configured in promiscuous mode IDS , or trigger response actions when the sensor is configured in inline protection mode IPS. Along all the variables used to calculate the risk rating, there is an Attach Relevancy Rating which represents whether or not the target is believed to be vulnerable to the attack.
For a detailed description on how risk rating is calculated, refer to the following documents:. This way, the Cisco IPS is capable of reducing the perceived severity of an attack when the target OS type is found not to be vulnerable and of increasing it when the target OS is known to be vulnerable.
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To activate this functionality, the reception of endpoint posture information should be configured within Cisco IPS external product interface. Under the Host Posture Settings s ection, complete the following:. This option is useful in filtering the host postures with IP addresses that might not be visible to the Cisco IPS or that might be duplicated across the network. Posture ACLs provide a mechanism to filter the network ranges from which host postures will be processed or ignored permitted or denied.
Key information is highlighted. As part of its threat control function, the CSA has the ability to quarantine hosts that violate security rules or exhibit malicious behavior. The quarantine of a host occurs either dynamically as a result of the global correlation of events from multiple CSAs, or manually by configuration of an administrator. When quarantined, the IP address of the host is added to the Quarantine IP list and all systems running CSA are instructed to block any communication attempt with the affected host. For improved threat visibility and overall control, the Cisco IPS external product interface can be configured to use the quarantine information generated by the CSA.
This way, every time a host is quarantined, the CSA will send a quarantine event to each one of the Cisco IPS sensors subscribed for the reception of quarantine information. The purpose of the watch list is to help the Cisco IPS monitor systems identified by the CSA as suspicious or malicious and to highlight any events associated with these systems. The watch list identifies systems that the Cisco IPS must monitor closely and which risk ratings must be increased. The watch list does not extend the quarantine of the hosts in the list to the Cisco IPS.
In fact, the Cisco IPS does not block a host solely because it is part of the list. The Cisco IPS does not automatically quarantine systems in the watch list. Every time a host in the watch list triggers an alert, the resulting risk rating is increased by the watch list rating.
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The watch list rating is configured as part of the external product interface and consists of the following three parameters configurable in a range of integer values between 0 to 35 :. By default, the increase value is set to By default the increase value is set to A host can be added to the watch list either manually by a CSA administrator or as a result of CSA global correlation:.
To quarantine a host manually, the administrator must add the IP address of the host to the Quarantined lP Addresses list. The configuration of dynamic quarantining requires the definition of a rule setting the offending host as globally untrusted, and to enable the global correlation of the event. The Cisco IPS implements watch lists primarily to highlight the activity of suspicious systems and, while the CSA isolates the hosts in the list, the Cisco IPS does not enforce quarantine automatically—although it is possible to combine the watch list with one or more event action overrides to dynamically block hosts in the list.
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An event action override is a general rule that sets response actions for events with risk ratings falling into specific ranges and that supersedes the actions defined at the signature level. As a result of a watch list, the Cisco IPS increases the risk rating of the events triggered by the systems in the list.
An event action override can be configured to block the offending host once it triggers an event exceeding a predefined threshold. The event action override should be configured to block the attacker inline when the system is configured in inline protection mode IPS and to block the host with a shunning when the system is in promiscuous mode IDS. Network events triggering alarms with a high risk rating more than 90 will cause the source host to be blocked inline by the Cisco IPS.
Other risk rating values are medium risk from 70 but less than 90 and low risk less than The implementation of event action overrides is a useful tool that extends the quarantine of hosts by the CSA to the Cisco IPS, thereby delivering a true end-to-end enforcement from the endpoint to the network. While the use of this practice yields clear benefits, there are some important aspects that should be considered prior to its adoption:.
An action on the host will be enforced only after the host triggers an event in the Cisco IPS. To verify the status of the external product interface, scroll-down to External Product Interface and look for Communications Status. The same section displays the list of systems in the CSA watch-list.
CSM efficiently manages a wide range of networks—from small networks consisting of a few devices to large networks with thousands of devices. Scalability is achieved through a rich feature set of shareable objects and policies and device grouping capabilities.
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Define policies and settings once and then optionally assign them to individual devices, groups of devices, or all the devices in the enterprise. For example: Routing, Manage all devices in the groups concurrently. New devices automatically acquire mandatory policies. The ACL hit count feature checks in real-time whether specific rules are being hit or triggered by packets. Used together, these two products provide a comprehensive security management solution that addresses configuration management, security monitoring, analysis, and mitigation.
CS-MARS aggregates and presents massive amounts of network and security data in an easy-to-use format. This bi-directional mapping of specific events to the policies that triggered them, combined with the ability to immediately modify the policies, can dramatically reduce the time spent configuring and troubleshooting large or complex networks. SBB Description: OpenVAS is a framework of several services and tools offering a comprehensive and powerful vulnerability scanning and vulnerability management solution.
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This technique also works well for eliminating different types of white noise, such as no-ops and useless arithmetic. SBB Description: Streisand is software for setting up secure connections with your friends.
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