qr code generator c# dll free Property User Must Change Password At Next Logon User Cannot Change Password in Visual C#.NET

Draw QR Code in Visual C#.NET Property User Must Change Password At Next Logon User Cannot Change Password

Property User Must Change Password At Next Logon User Cannot Change Password
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Establishing Account and Password Requirements for Information Security
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Table 6-6 User Account Properties That Affect Passwords
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Property Password Never Expires
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Definition Account will never be prompted for change. This is a good setting for service accounts. Service accounts are not to be used interactively and therefore would never be able to change before they expired. Passwords are by default hashed and then stored in the password database. Enabling this setting will prevent that from occurring and weaken password protection.
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In addition to the account interface, user settings can be changed or discovered by using the net user command. This command also allows administrators to manage accounts in the local database in a way that is not exposed in the GUI, and it allows them to obtain current information about the account that is not exposed in logs or GUI. For example, the following command lists information about the Administrator account, which includes the date the password was last set and the date of the user s last logon. Partial results of the command are displayed in Figure 6-12.
Net user administrator
Figure 6-12 Displaying user properties with net user
See Also
The syntax of the net user command can be read online at: http://support.microsoft.com/default.aspx scid=kb;en-us;251394.
6-44
6
Designing a Logical Authentication Strategy
Security Options Security options are located in the Windows Configuration, Security Settings, Local Policy, Security Options container. Table 6-7 provides information on relevant security options.
Table 6-7
Password-Related Security Options
Default Definition If an account does not have a password, it cannot be used to remotely log on to the computer. If enabled, the domain controller will refuse all computer requests to change its password. Use this option to refuse all requests. Prevents the computer from requesting that its account password be changed. Apply this option in an OU to prevent requests being made. How often a computer will attempt to change its password. Use this request to set the number of days for the request. During logon, the user will be notified that she must change her password within this number of days. This number represents the number of days before the password will expire. Some third-party Server Message Block (SMB) servers are not able to use the credentials, as they are normally configured when passed to a remote computer. Setting this policy means that a plaintext password will be sent to any third-party SMB server.
Option
Accounts: Limit local account Enabled use of blank passwords to console logon only. Domain Controller: Refuse machine account password change. Domain Member: Disable machine account password changes. Domain Member: Maximum machine account password age. Interactive Logon: Prompt user to change password before expiration. Disabled
Disabled
Set for 30 days Set for 14 days
Disabled Microsoft Network Client: Send unencrypted password to third-party SMB servers.
The Limitations of Technical Controls
Where technical controls can be used to enforce password policy, they should be used. However, the designer should understand their limitations:
The password complexity requirement might not provide any additional security unless users are trained in producing strong passwords. Using this control will force users to create passwords using characters, numbers, and symbols, and this will prevent casual password guessing. However, password-cracking products can quickly crack some these combinations, especially if they are able to use the LM password hash. Users might write down passwords in easily discovered places. This is especially true where passwords must be complex, long, and change frequently. Research has shown that seven is the maximum number of letters or numbers that most people can easily remember.
Lesson 3
Establishing Account and Password Requirements for Information Security
6-45
See Also
Bell Labs did a lot of research on memory in the early days of telephones. One thing that the company learned was that the optimum number of digits people could remem ber was seven. This is why, at least in the United States, telephone numbers are seven digits long. You can read more at www.hastingsresearch.com/net/05-nomenclature.shtml.
Users might share passwords with co-workers. If one character in the password is changed before submitting it as a new password, the operating system sees it as a new password. The history requirement will not prevent this type of password reuse. To an attacker who knows an old password, the obvious strategy when refused its use is to change one character and try again. Attackers know the typical user will change the last character because this change is more easily remembered. Users forget their password and must have it reset. This means somebody must have the power to do so for them. The typical resource for password changes is the Help Desk. A strong Help Desk policy, training, and enforcement practice must be used to ensure that this privilege is not abused. If a password is administratively reset, the user must change his password because the person who reset it also knows it. This can be forced by setting the account property User Must Change Password At Next Logon. However, if this is not set, the user might not remember to change her password on her own. The individual who resets the password might realize this and use the opportunity to take advan tage of that knowledge. There is no technical control to enforce a user-by-user change in password strength policy. Often various areas of the organization have different needs for stronger passwords. Administrators and those with access to sensitive information should be required to use stronger passwords. However, there is no technical way to do so. The need to use one password policy per domain weakens the policy.
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