The Red Hat Enterprise Linux operating system must audit all uses of the openat syscall.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-204532	RHEL-07-030520	SV-204532r505924_rule		Medium

Description

Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). When a user logs on, the auid is set to the uid of the account that is being authenticated. Daemons are not user sessions and have the loginuid set to -1. The auid representation is an unsigned 32-bit integer, which equals 4294967295. The audit system interprets -1, 4294967295, and "unset" in the same way. Satisfies: SRG-OS-000064-GPOS-00033, SRG-OS-000458-GPOS-00203, SRG-OS-000461-GPOS-00205, SRG-OS-000392-GPOS-00172

STIG	Date
Red Hat Enterprise Linux 7 Security Technical Implementation Guide	2020-09-03

Details

Check Text ( C-4656r462600_chk )

Verify the operating system generates audit records when successful/unsuccessful attempts to use the "openat" syscall occur. Check the file system rules in "/etc/audit/audit.rules" with the following commands: # grep -iw openat /etc/audit/audit.rules -a always,exit -F arch=b32 -S openat -F exit=-EPERM -F auid>=1000 -F auid!=unset -k access -a always,exit -F arch=b32 -S openat -F exit=-EACCES -F auid>=1000 -F auid!=unset -k access -a always,exit -F arch=b64 -S openat -F exit=-EPERM -F auid>=1000 -F auid!=unset -k access -a always,exit -F arch=b64 -S openat -F exit=-EACCES -F auid>=1000 -F auid!=unset -k access If both the "b32" and "b64" audit rules are not defined for the "openat" syscall, this is a finding. If the output does not produce rules containing "-F exit=-EPERM", this is a finding. If the output does not produce rules containing "-F exit=-EACCES", this is a finding.

Fix Text (F-4656r462601_fix)

Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "openat" syscall occur. Add or update the following rules in "/etc/audit/rules.d/audit.rules": -a always,exit -F arch=b32 -S openat -F exit=-EPERM -F auid>=1000 -F auid!=unset -k access -a always,exit -F arch=b32 -S openat -F exit=-EACCES -F auid>=1000 -F auid!=unset -k access -a always,exit -F arch=b64 -S openat -F exit=-EPERM -F auid>=1000 -F auid!=unset -k access -a always,exit -F arch=b64 -S openat -F exit=-EACCES -F auid>=1000 -F auid!=unset -k access The audit daemon must be restarted for the changes to take effect.