The vCenter Server must limit membership to the "SystemConfiguration.BashShellAdministrators" Single Sign-On (SSO) group.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-256370	SRG-APP-000516	VCSA-70-000290	SV-256370r885721_rule	2023-12-21	1

Description
vCenter SSO integrates with PAM in the underlying Photon operating system so members of the "SystemConfiguration.BashShellAdministrators" SSO group can log on to the operating system without needing a separate account. However, even though unique SSO users log on, they are transparently using a group account named "sso-user" as far as Photon auditing is concerned. While the audit trail can still be traced back to the individual SSO user, it is a more involved process. To force accountability and nonrepudiation, the SSO group "SystemConfiguration.BashShellAdministrators" must be severely restricted.

Description

vCenter SSO integrates with PAM in the underlying Photon operating system so members of the "SystemConfiguration.BashShellAdministrators" SSO group can log on to the operating system without needing a separate account. However, even though unique SSO users log on, they are transparently using a group account named "sso-user" as far as Photon auditing is concerned. While the audit trail can still be traced back to the individual SSO user, it is a more involved process. To force accountability and nonrepudiation, the SSO group "SystemConfiguration.BashShellAdministrators" must be severely restricted.

ℹ️ Check
From the vSphere Client, go to Administration >> Single Sign On >> Users and Groups >> Groups. Click the next page arrow until the "SystemConfiguration.BashShellAdministrators" group appears. Click "SystemConfiguration.BashShellAdministrators". Review the members of the group and ensure that only authorized accounts are present. Note: These accounts act as root on the Photon operating system and have the ability to severely damage vCenter, inadvertently or otherwise. If there are any accounts present as members of SystemConfiguration.BashShellAdministrators that are not authorized, this is a finding.

ℹ️ Check

From the vSphere Client, go to Administration >> Single Sign On >> Users and Groups >> Groups. Click the next page arrow until the "SystemConfiguration.BashShellAdministrators" group appears. Click "SystemConfiguration.BashShellAdministrators". Review the members of the group and ensure that only authorized accounts are present. Note: These accounts act as root on the Photon operating system and have the ability to severely damage vCenter, inadvertently or otherwise. If there are any accounts present as members of SystemConfiguration.BashShellAdministrators that are not authorized, this is a finding.

✔️ Fix
From the vSphere Client, go to Administration >> Single Sign On >> Users and Groups >> Groups. Click the next page arrow until the "SystemConfiguration.BashShellAdministrators" group appears. Click "SystemConfiguration.BashShellAdministrators". Click the three vertical dots next to the name of each unauthorized account. Select "Remove Member".