UCF STIG Viewer Logo

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


Overview

Finding ID Version Rule ID IA Controls Severity
V-204519 RHEL-07-030390 SV-204519r603261_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-000392-GPOS-00172, SRG-OS-000458-GPOS-00203, SRG-OS-000474-GPOS-00219
STIG Date
Red Hat Enterprise Linux 7 Security Technical Implementation Guide 2021-03-01

Details

Check Text ( C-4643r462564_chk )
Verify the operating system generates audit records when successful/unsuccessful attempts to use the "lchown" syscall occur.

Check the file system rules in "/etc/audit/audit.rules" with the following commands:

# grep -iw lchown /etc/audit/audit.rules

-a always,exit -F arch=b32 -S lchown -F auid>=1000 -F auid!=unset -k perm_mod

-a always,exit -F arch=b64 -S lchown -F auid>=1000 -F auid!=unset -k perm_mod

If both the "b32" and "b64" audit rules are not defined for the "lchown" syscall, this is a finding.
Fix Text (F-4643r462565_fix)
Add or update the following rules in "/etc/audit/rules.d/audit.rules":

-a always,exit -F arch=b32 -S lchown -F auid>=1000 -F auid!=unset -k perm_mod

-a always,exit -F arch=b64 -S lchown -F auid>=1000 -F auid!=unset -k perm_mod

The audit daemon must be restarted for the changes to take effect.