SLEM 5 must deny direct logons to the root account using remote access via SSH.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-261337	SLEM-05-255060	SV-261337r996844_rule		Medium

Description
To ensure individual accountability and prevent unauthorized access, organizational users must be individually identified and authenticated. A group authenticator is a generic account used by multiple individuals. Use of a group authenticator alone does not uniquely identify individual users. Examples of the group authenticator is the Unix OS "root" user account, the Windows "Administrator" account, the "sa" account, or a "helpdesk" account. For example, the Unix and Windows SLEM 5 offer a "switch user" capability, allowing users to authenticate with their individual credentials and, when needed, "switch" to the administrator role. This method provides for unique individual authentication prior to using a group authenticator. Users (and any processes acting on behalf of users) need to be uniquely identified and authenticated for all accesses other than those accesses explicitly identified and documented by the organization, which outlines specific user actions that can be performed on SLEM 5 without identification or authentication. Requiring individuals to be authenticated with an individual authenticator prior to using a group authenticator allows for traceability of actions, as well as adding an additional level of protection of the actions that can be taken with group account knowledge.

Description

To ensure individual accountability and prevent unauthorized access, organizational users must be individually identified and authenticated. A group authenticator is a generic account used by multiple individuals. Use of a group authenticator alone does not uniquely identify individual users. Examples of the group authenticator is the Unix OS "root" user account, the Windows "Administrator" account, the "sa" account, or a "helpdesk" account. For example, the Unix and Windows SLEM 5 offer a "switch user" capability, allowing users to authenticate with their individual credentials and, when needed, "switch" to the administrator role. This method provides for unique individual authentication prior to using a group authenticator. Users (and any processes acting on behalf of users) need to be uniquely identified and authenticated for all accesses other than those accesses explicitly identified and documented by the organization, which outlines specific user actions that can be performed on SLEM 5 without identification or authentication. Requiring individuals to be authenticated with an individual authenticator prior to using a group authenticator allows for traceability of actions, as well as adding an additional level of protection of the actions that can be taken with group account knowledge.

STIG	Date
SUSE Linux Enterprise Micro (SLEM) 5 Security Technical Implementation Guide	2024-06-04

Details

Check Text ( C-65066r996473_chk )
Verify SLEM 5 denies direct logons to the root account using remote access via SSH with the following command: > sudo /usr/sbin/sshd -dd 2>&1 \| awk '/filename/ {print $4}' \| tr -d '\r' \| tr '\n' ' ' \| xargs sudo grep -iH '^\s*permitrootlogin' /etc/ssh/sshd_config:PermitRootLogin no If the "PermitRootLogin" keyword is set to "yes", is commented out, missing, or conflicting results are returned, this is a finding.

Check Text ( C-65066r996473_chk )

Verify SLEM 5 denies direct logons to the root account using remote access via SSH with the following command:

> sudo /usr/sbin/sshd -dd 2>&1 | awk '/filename/ {print $4}' | tr -d '\r' | tr '\n' ' ' | xargs sudo grep -iH '^\s*permitrootlogin'
/etc/ssh/sshd_config:PermitRootLogin no

If the "PermitRootLogin" keyword is set to "yes", is commented out, missing, or conflicting results are returned, this is a finding.

Fix Text (F-64974r995877_fix)
Configure SLEM 5 to deny direct logons to the root account using remote access via SSH. Add or modify the following line in the "/etc/ssh/sshd_config" file: PermitRootLogin no