Finding ID | Version | Rule ID | IA Controls | Severity |
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V-219166 | UBTU-18-010033 | SV-219166r802355_rule | Medium |
Description |
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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 |
STIG | Date |
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Canonical Ubuntu 18.04 LTS Security Technical Implementation Guide | 2021-11-29 |
Check Text ( C-20891r802353_chk ) |
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Verify that the Ubuntu operating system utilizes the "pam_faillock" module with the following command: $ grep faillock /etc/pam.d/common-auth auth [default=die] pam_faillock.so authfail auth sufficient pam_faillock.so authsucc If the pam_faillock.so module is not present in the "/etc/pam.d/common-auth" file, this is a finding. Verify the pam_faillock module is configured to use the following options: $ sudo egrep 'silent|audit|deny|fail_interval| unlock_time' /etc/security/faillock.conf audit silent deny = 3 fail_interval = 900 unlock_time = 0 If the "silent" keyword is missing or commented out, this is a finding. If the "audit" keyword is missing or commented out, this is a finding. If the "deny" keyword is missing, commented out, or set to a value greater than 3, this is a finding. If the "fail_interval" keyword is missing, commented out, or set to a value greater than 900, this is a finding. If the "unlock_time" keyword is missing, commented out, or is not set to 0, this is a finding. |
Fix Text (F-20890r802354_fix) |
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Configure the Ubuntu operating system to utilize the "pam_faillock" module. Edit the /etc/pam.d/common-auth file. Add the following lines below the "auth" definition for pam_unix.so: auth [default=die] pam_faillock.so authfail auth sufficient pam_faillock.so authsucc Configure the "pam_faillock" module to use the following options: Edit the /etc/security/faillock.conf file and add/update the following keywords and values: audit silent deny = 3 fail_interval = 900 unlock_time = 0 |