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6. Determine whether auditing must be configured on this object only or on other child objects. For example, if the object is a folder and you want to audit activity on files and subfolders, select Apply these auditing entries to objects and/or containers within this container only. 7. Configure settings for the Users, Computers, and Groups whose activities you want to track, and complete the process by clicking OK. 8. In the Group Policy snap-in, navigate to: Local Computer Policy\Computer Configuration\Windows Settings \Security Settings\Local Policies\Audit Policy 9. Double-click Audit object access. 10. Select the appropriate check boxes for logging Success, Failure, or both. 11. Click OK. The list of configurable entries is almost identical to the list of Access Control Entries for files and folders. For more information about ACEs for files and folders, see Access Control Entries earlier in this chapter.

Windows XP Professional provides the option to audit the use of privileges. Although this setting can be either enabled or disabled, it cannot be applied selectively to individual rights. Warning Auditing the use of user privileges generates a very large number of audits, and in most cases the value of the information this provides does not outweigh the associated management costs. Therefore, do not audit the use of user privileges unless it is strictly necessary for your environment. If you must audit the use of user privileges, it might be worthwhile to obtain or write an event-analysis tool that can gather information about only the user rights that are of interest to you.

G Brute-force attacks. Brute-force attacks use the automation power of com-

Enabling the Use of Privileges category in the system s Audit policy does not enable the audit of all user rights. The following user rights are never audited:

Bypass Traverse Checking (SeChangeNotifyPrivilege) Generate Security Audits (SeAuditPrivilege) Create A Token Object (SeCreateTokenPrivilege) Debug Programs (SeDebugPrivilege) Replace A Process Level Token (SeAssignPrimaryTokenPrivilege)

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puters to attack secure systems, either by trying all possible combinations of a logon password or by attempting to perform cryptographic analysis on protected network traffic. These techniques require extreme computational power and are unlikely to work on properly encrypted data and secure systems. For example, decrypting a data packet that has been protected with 128-bit encryption could take a standard desktop PC literally millions of years of constant computation. However, flaws in encryption mechanisms or system logon routines can be relatively easily exposed using these bruteforce techniques.

The following user rights are audited only if a specific registry entry is present:

Backup Files and Directories (SeBackupPrivilege) Restore Files and Directories (SeRestorePrivilege)

You can enable auditing of these privileges by using the security policy user interface in Windows XP Professional.

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Account Management audit policy is very detailed in Windows XP Professional. Enabling auditing for this event category allows you to record the success or failure of the domain and local events that are listed with their event numbers in the Security Event Messages document on the companion CD.

35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 } } } } }

The Event Viewer is an MMC snap-in that enables you to view three different logs that are stored by Windows XP Professional:

The System log contains events logged by the Windows XP Professional system components, such as drivers or other system components that failed to load during startup. Windows XP Professional predetermines the event types logged by the system components.

traffic from interception and eavesdropping. If the communication channel between two systems is not properly authenticated, an attacker could perform a man-in-themiddle attack, in which the attacker poses as the remote communication partner for an encrypted data exchange to both the client and server. This enables the attacker to negotiate encryption channels with both partners and watch all the traffic being exchanged between them. For this reason, secure protocols such as HTTPS rely on signed certificates that are verified by a trusted third party (such as Thawte or VeriSign) to represent the identity of the remote communication partner.

The Application log contains events logged by applications or programs. For example, a database program might record a file error in the application log. The program developer decides which events to record. Many Windows XP Professional services (such as DHCP, DNS, and File Replication Services) use the application log.

The Security log, if configured to do so, records security events, such as valid and invalid logon attempts. Events that are related to resource use such as creating, opening, or deleting files can also be logged. An administrator can specify the events that are recorded in the security log policy.

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