RMF Control AC-7: Unsuccessful Logon Attempts is a cybersecurity control that helps to protect information systems by limiting the number of unsuccessful logon attempts that a user is allowed to make. This control is important because it can help to prevent unauthorized access to information systems and data.
Unsuccessful Logon Attempts Requirements
The RMF Control AC-7: Unsuccessful Logon Attempts requirements are specified in NIST Special Publication 800-53, Revision 5. The requirements state that the organization must:
- Enforce a limit on the number of consecutive unsuccessful logon attempts by a user during a specified time period; and
- Automatically lock the account or node for a specified time period or until released by an administrator when the maximum number of unsuccessful logon attempts is exceeded.
Unsuccessful Logon Attempts Best Practices
In addition to the RMF Control AC-7: Unsuccessful Logon Attempts requirements, there are a number of best practices that organizations can follow to improve their unsuccessful logon attempts posture. These best practices include:
- Setting a low limit on the number of consecutive unsuccessful logon attempts (e.g., three).
- Setting a short lock out period (e.g., 15 minutes).
- Implementing a delay algorithm to increase the time between logon attempts after each unsuccessful attempt.
- Monitoring and auditing logon activity to identify and respond to patterns of unsuccessful logon attempts.
- Educating users on the importance of using strong passwords and how to avoid common password mistakes.
Conclusion
RMF Control AC-7: Unsuccessful Logon Attempts is an important cybersecurity control that helps to protect information systems by limiting the number of unsuccessful logon attempts that a user is allowed to make. By following the RMF Control AC-7: Unsuccessful Logon Attempts requirements and best practices, organizations can help to reduce the risk of unauthorized access to information systems and data.
Here are some additional tips for implementing and enforcing unsuccessful logon attempts:
- Use a centralized authentication system to manage user accounts and logon attempts.
- Implement a multi-factor authentication (MFA) solution to add an extra layer of security to the logon process.
- Use a security information and event management (SIEM) system to monitor and audit logon activity for suspicious behavior.
- Educate users on the importance of reporting any suspicious logon activity to their IT department.
By following these tips, organizations can help to ensure that their information systems are protected from brute-force attacks and other unauthorized access attempts.