Successful/unsuccessful uses of the umount system call in RHEL 9 must generate an audit record.
An XCCDF Rule
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
- ID
- SV-258215r1045430_rule
- Version
- RHEL-09-654205
- Severity
- Medium
- References
- Updated
Remediation Templates
A Manual Procedure
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
To load the rules to the kernel immediately, use the following command:
$ sudo augenrules --load