Check: RHEL-09-654205
RHEL 9 STIG:
RHEL-09-654205
(in versions v2 r2 through v1 r1)
Title
Successful/unsuccessful uses of the umount system call in RHEL 9 must generate an audit record. (Cat II impact)
Discussion
The changing of file permissions could indicate that a user is attempting to gain access to information that would otherwise be disallowed. Auditing DAC modifications can facilitate the identification of patterns of abuse among both authorized and unauthorized users. Satisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000062-GPOS-00031, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215
Check Content
Verify that RHEL 9 generates an audit record for all uses of the "umount" and system call with the following command: $ sudo grep "umount" /etc/audit/audit.* If the system is configured to audit this activity, it will return a line like the following: -a always,exit -F arch=b32 -S umount -F auid>=1000 -F auid!=unset -k privileged-umount If the command does not return a line, or the line is commented out, this is a finding.
Fix Text
Configure the audit system to generate an audit event for any successful/unsuccessful use of the "umount" system call by adding or updating the following rules in "/etc/audit/audit.rules" and adding the following rules to "/etc/audit/rules.d/perm_mod.rules" or updating the existing rules in files in the "/etc/audit/rules.d/" directory: -a always,exit -F arch=b32 -S umount -F auid>=1000 -F auid!=unset -k privileged-umount The audit daemon must be restarted for the changes to take effect.
Additional Identifiers
Rule ID: SV-258215r958412_rule
Vulnerability ID: V-258215
Group Title: SRG-OS-000037-GPOS-00015
Expert Comments
CCIs
| Number | Definition |
|---|---|
| CCI-000130 |
Ensure that audit records contain information that establishes what type of event occurred. |
| CCI-000169 |
Provide audit record generation capability for the event types the system is capable of auditing as defined in AU-2 a on organization-defined information system components. |
| CCI-000172 |
Generate audit records for the event types defined in AU-2 c that include the audit record content defined in AU-3. |
| CCI-002884 |
Log organization-defined audit events for nonlocal maintenance and diagnostic sessions. |