STIGQter: STIG Summary: Canonical Ubuntu 20.04 LTS Security Technical Implementation Guide Version: 1 Release: 1 Benchmark Date: 10 Mar 2021:

The Ubuntu operating system must be configured such that Pluggable Authentication Module (PAM) prohibits the use of cached authentications after one day.

DISA Rule

SV-238362r654261_rule

Vulnerability Number

V-238362

Group Title

SRG-OS-000383-GPOS-00166

Rule Version

UBTU-20-010441

Severity

CAT III

CCI(s)

• CCI-002007 - The information system prohibits the use of cached authenticators after an organization-defined time period.

Weight

10

Fix Recommendation

Configure PAM to prohibit the use of cached authentications after one day. Add or change the following line in "/etc/sssd/sssd.conf" just below the line "[pam]":

offline_credentials_expiration = 1

Note: It is valid for this configuration to be in a file with a name that ends with ".conf" and does not begin with a "." in the "/etc/sssd/conf.d/" directory instead of the "/etc/sssd/sssd.conf" file.

Check Contents

If smart card authentication is not being used on the system, this s Not Applicable.

Verify that PAM prohibits the use of cached authentications after one day with the following command:

$ sudo grep offline_credentials_expiration /etc/sssd/sssd.conf /etc/sssd/conf.d/*.conf

offline_credentials_expiration = 1

If "offline_credentials_expiration" is not set to a value of "1" in "/etc/sssd/sssd.conf" or in a file with a name ending in .conf in the "/etc/sssd/conf.d/" directory, this is a finding.

Vulnerability Number

V-238362

Documentable

False

Rule Version

UBTU-20-010441

Severity Override Guidance

If smart card authentication is not being used on the system, this s Not Applicable.

Verify that PAM prohibits the use of cached authentications after one day with the following command:

$ sudo grep offline_credentials_expiration /etc/sssd/sssd.conf /etc/sssd/conf.d/*.conf

offline_credentials_expiration = 1

If "offline_credentials_expiration" is not set to a value of "1" in "/etc/sssd/sssd.conf" or in a file with a name ending in .conf in the "/etc/sssd/conf.d/" directory, this is a finding.

Check Content Reference

M

Target Key

5318

Comments