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  4. UBTU-18-010033 – The Ubuntu operating system must be configured so that three consecutive invalid logon attempts by a user automatically locks the account until released by an administrator.
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UBTU-18-010033 – The Ubuntu operating system must be configured so that three consecutive invalid logon attempts by a user automatically locks the account until released by an administrator.

Details

By limiting the number of failed logon attempts, the risk of unauthorized system access via user password guessing, otherwise known as brute-force attacks, is reduced. Limits are imposed by locking the account.

Satisfies: SRG-OS-000329-GPOS-00128

Solution

Configure the Ubuntu operating system to lock an account after three unsuccessful login attempts.

Edit the /etc/pam.d/common-auth file. The pam_tally2.so entry must be placed at the top of the ‘auth’ stack. So add the following line before the first ‘auth’ entry in the file.

auth required pam_tally2.so onerr=fail deny=3

Supportive Information

The following resource is also helpful.

This security hardening control applies to the following category of controls within NIST 800-53: Access Control.This control applies to the following type of system Unix.

References

Source

Updated on July 16, 2022
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