STIGQter: STIG Summary: Oracle Linux 6 Security Technical Implementation Guide Version: 2 Release: 3 Benchmark Date: 23 Apr 2021:

The system must disable accounts after excessive login failures within a 15-minute interval.

DISA Rule

SV-219583r603263_rule

Vulnerability Number

V-219583

Group Title

SRG-OS-000329

Rule Version

OL6-00-000357

Severity

CAT II

CCI(s)

• CCI-002238 - The information system automatically locks the account or node for either an organization-defined time period, until the locked account or node is released by an administrator, or delays the next logon prompt according to the organization-defined delay algorithm when the maximum number of unsuccessful logon attempts is exceeded.

Weight

10

Fix Recommendation

Utilizing "pam_faillock.so", the "fail_interval" directive configures the system to lock out accounts after a number of incorrect logon attempts. Modify the content of both "/etc/pam.d/system-auth" and "/etc/pam.d/password-auth" as follows:

Add the following line immediately before the "pam_unix.so" statement in the "AUTH" section:

auth required pam_faillock.so preauth silent deny=3 unlock_time=900 fail_interval=900

Add the following line immediately after the "pam_unix.so" statement in the "AUTH" section:

auth [default=die] pam_faillock.so authfail deny=3 unlock_time=900 fail_interval=900

Add the following line immediately before the "pam_unix.so" statement in the "ACCOUNT" section:

account required pam_faillock.so

Note that any updates made to "/etc/pam.d/system-auth" and "/etc/pam.d/password-auth" may be overwritten by the "authconfig" program. The "authconfig" program should not be used.

Check Contents

To ensure the failed password attempt policy is configured correctly, run the following command:

$ grep pam_faillock /etc/pam.d/system-auth /etc/pam.d/password-auth

For each file, the output should show "fail_interval=<interval-in-seconds>" where "interval-in-seconds" is 900 (15 minutes) or greater. If the "fail_interval" parameter is not set, the default setting of 900 seconds is acceptable. If that is not the case, this is a finding.

Vulnerability Number

V-219583

Documentable

False

Rule Version

OL6-00-000357

Severity Override Guidance

To ensure the failed password attempt policy is configured correctly, run the following command:

$ grep pam_faillock /etc/pam.d/system-auth /etc/pam.d/password-auth

For each file, the output should show "fail_interval=<interval-in-seconds>" where "interval-in-seconds" is 900 (15 minutes) or greater. If the "fail_interval" parameter is not set, the default setting of 900 seconds is acceptable. If that is not the case, this is a finding.

Check Content Reference

M

Target Key

2928

Comments