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Successful/unsuccessful uses of the umount system call in RHEL 9 must generate an audit record.


Overview

Finding ID Version Rule ID IA Controls Severity
V-258215 RHEL-09-654205 SV-258215r958412_rule Medium
Description
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
STIG Date
Red Hat Enterprise Linux 9 Security Technical Implementation Guide 2024-06-04

Details

Check Text ( C-61956r926630_chk )
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 (F-61880r943017_fix)
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.