The rationale behind the behavioral approach is that although the number of methods and exploits to attack a system is extremely large, the number of possible consequences of these attacks is relatively small. For example, a web server can be persuaded by the attacker to execute a local file or an executable attachment in an e-mail attempting to access the Windows Registry. CSA can recognize application behavior leading to or following an attack and prevent the malicious actions.
This ability is also why CSA does not require constant updates; its policies need to be updated only if a completely different class of attacks is created, which is relatively rare.
The free headless agent has a fixed security policy and no centralized reporting capabilities. For each type of IP telephony server, a different predefined agent kit is available for the headless agent. The headless agent is configured with appropriate policies and exceptions for a typical supported configuration of that server.
The headless agent should be used in environments where centralized reporting is not required or practical and the IP telephony servers are aligned with Cisco specifications for installed software and system and application configuration and where they feature no add-ons that might conflict with the security rules of the headless agent. The headless agent is also commonly referred to as the standalone CSA agent on the Cisco website.
As with the headless agent, which comes in different configurations for different types of IP telephony servers, CSA MC also allows the administrator to load predefined, application-specific policies for each IP telephony server type. The managed agent should be used in environments where centralized reporting is required, where servers do not use a typical configuration for example, with nondefault TCP or UDP ports or have special application requirements for example, custom systems management software , or where the default policies need to be augmented with site-specific protection requirements.
Deployment of the managed agent also allows the use of CSA Profiler, an expert add-on tool that can, to a large extent, automate generation of custom application policies. The CSA Profiler must be purchased separately, but it does not require any other software to be installed on the profiled servers. The CSA default operating system protection rules for IP telephony servers provide basic operating system hardening and integrity protection and contain rule exceptions for supported add-on applications.
In regard to local resource access control, these policies can be summarized as follows:. In addition to these basic rules, many other rule modules constitute the total CSA protection policy of a system. At the minimum, for each server, deploy the headless CSA, as shown in Figure Cisco Security Conversion Tool Money Manager Ex This Money Manager Ex Other DBF Manager.
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