Title

SLEM 5 must prevent nonprivileged users from executing privileged functions, including disabling, circumventing, or altering implemented security safeguards/countermeasures. (Cat II impact)

Discussion

Preventing nonprivileged users from executing privileged functions mitigates the risk that unauthorized individuals or processes may gain unnecessary access to information or privileges. Privileged functions include, for example, establishing accounts, performing system integrity checks, or administering cryptographic key management activities. Nonprivileged users are individuals who do not possess appropriate authorizations. Circumventing intrusion detection and prevention mechanisms or malicious code protection mechanisms are examples of privileged functions that require protection from nonprivileged users.

Check Content

Verify SLEM 5 prevents nonprivileged users from executing privileged functions, including disabling, circumventing, or altering implemented security safeguards/countermeasures. Obtain a list of authorized users (other than system administrator and guest accounts) for the system. Check the list against the system with the following command: > sudo semanage login -l | more Login Name SELinux User MLS/MCS Range Service __default__ user_u s0-s0:c0.c1023 * root unconfined_u s0-s0:c0.c1023 * system_u system_u s0-s0:c0.c1023 * joe staff_u s0-s0:c0.c1023 * All administrators must be mapped to the "sysadm_u", "staff_u", or an appropriately tailored confined role as defined by the organization. All authorized nonadministrative users must be mapped to the "user_u" role. If any interactive users are not mapped in this way, this is a finding.

Fix Text

Configure SLEM 5 to prevent nonprivileged users from executing privileged functions, including disabling, circumventing, or altering implemented security safeguards/countermeasures. Use the following command to map a new user to the "sysadm_u" role: > sudo semanage login -a -s sysadm_u <username> Use the following command to map an existing user to the "sysadm_u" role: > sudo semanage login -m -s sysadm_u <username> Use the following command to map a new user to the "staff_u" role: > sudo semanage login -a -s staff_u <username> Use the following command to map an existing user to the "staff_u" role: > sudo semanage login -m -s staff_u <username> Use the following command to map a new user to the "user_u" role: > sudo semanage login -a -s user_u <username> Use the following command to map an existing user to the "user_u" role: > sudo semanage login -m -s user_u <username>

Additional Identifiers

Rule ID: SV-261371r996554_rule

Vulnerability ID: V-261371

Group Title: SRG-OS-000324-GPOS-00125

Expert Comments

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