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After you configure alert definitions, you must manage the alerts that are created. Many of the ISA Server alerts are used to report on detected intrusion attempts. If you configure the intrusion-detection alerts to shut down the ISA Firewall Service, then ISA Server will go into lockdown mode when the service is shut down. You will need to manage the ISA Server lockdown mode. You can manage all alerts in the Alerts view of the Monitoring Node in the ISA Server Management Console. It is important to manage this list to easily recognize the most recent alerts as well as to purge alerts that are no longer relevant.

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A primary reason for using alerts is for intrusion detection. Intrusion detection identifies when an attack is attempted against your network and then triggers an alert. You can configure the alert actions that ISA Server will perform in the event of a detected intrusion attempt.

Figure 11-16

For more information about the intrusion-detection options available with ISA Server, see 7, Configuring ISA Server as a Firewall.

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Now life gets interesting. The TGT for the Administrator account, like the TGT for the system, is stored in the Kerberos ticket cache. It is used when the Administrator account requests access to services. You can examine your ticket cache by using the Kerbtray.exe utility. To use Kerbtray.exe, you run the self-installing file by doubleclicking it and then clicking the executable to run the tool. This procedure places an icon on the taskbar, which can then be opened by clicking it to reveal the tickets in the cache. Figure 11-17 shows the list of tickets in the cache and the Administrator account s TGT ticket.

Figure 11-17 Using the Kerbtray.exe utility to view Kerberos tickets in the ticket cache of the local machine

If your ISA Server is exposed to the Internet, it is almost inevitable that it will be exposed to intrusion attempts. When an attack occurs, it may seem that the first line of defense is to disconnect from the Internet, isolating the compromised network from the attack. However, this is not recommended for most attacks. By default, ISA Server raises an alert when it detects an intrusion attempt and writes an event to the event log. In most cases, you should not modify the default as ISA Server is capable of blocking the known intrusion attempts. In some cases, you may get hundreds of intrusion attempts in a day, all of which are successfully blocked. However, there may be some cases where you want to enable additional actions when ISA Server detects an intrusion attempt. For example, if a new vulnerability is discovered in an application server, you may want to configure ISA Server to detect an attack aimed at the vulnerability and shut down the ISA Server Firewall Service if it detects the attack. This should be a temporary measure until you can fix the application server vulnerability.

Monitoring Network Protocol Security 11-45

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One of the first requests is for the services of the local computer In Figure 11-17, notice that tickets are listed for several services: Host, IAM$, Common Internet File System (CIFS), and LDAP All these services were requested at logon and represent the Admin istrator s ability to access the local computer (Host and IAM$), to access a share on the domain controller (CIFS), and to make LDAP queries to the directory service (LDAP) Requests for service tickets include the TGT and another authenticator Because the TGT is cached, you might wonder whether it could be captured and possibly used in a replay attack The use of a new authenticator protects the KDC Because the time on the server has changed, the authenticator message, the timestamp, will always be current, and the KDC can check that it is within the time skew policy of its domain.

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(Time skew is the difference between the KDC s time and the client s; if it is off by more than the policy skew time, the Kerberos request is rejected) Kerberos Role in Authorization Kerberos is an authentication protocol, but it does play a role in authorization If you map a drive to a share on a computer, the Kerberos TGT requests a session ticket for the CIFS Server service on the computer, imple mented using the CIFS protocol If a Network Monitor capture is made, you can trace the steps in accessing the share However, the service ticket does not give users access to the share The ticket authen ticates users only to the server It says, in essence, that the users are who they say they are, and the server does not have to check in with the domain controller to verify this information.

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