All uses of the lchown command must be audited.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-72101	RHEL-07-030390	SV-86725r2_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). Satisfies: SRG-OS-000064-GPOS-00033, SRG-OS-000392-GPOS-00172, SRG-OS-000458-GPOS-00203, SRG-OS-000474-GPOS-00219

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). 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	2017-07-08

Details

Check Text ( C-72333r5_chk )
Verify the operating system generates audit records when successful/unsuccessful attempts to use the "lchown" command occur. Check the file system rules in "/etc/audit/audit.rules" with the following commands: Note: The output lines of the command are duplicated to cover both 32-bit and 64-bit architectures. Only the lines appropriate for the system architecture must be present. # grep -i lchown /etc/audit/audit.rules -a always,exit -F arch=b32 -S lchown -F auid>=1000 -F auid!=4294967295 -k perm_mod -a always,exit -F arch=b64 -S lchown -F auid>=1000 -F auid!=4294967295 -k perm_mod If the command does not return any output, this is a finding.

Check Text ( C-72333r5_chk )

Verify the operating system generates audit records when successful/unsuccessful attempts to use the "lchown" command occur.

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

Note: The output lines of the command are duplicated to cover both 32-bit and 64-bit architectures. Only the lines appropriate for the system architecture must be present.

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

-a always,exit -F arch=b32 -S lchown -F auid>=1000 -F auid!=4294967295 -k perm_mod

-a always,exit -F arch=b64 -S lchown -F auid>=1000 -F auid!=4294967295 -k perm_mod

If the command does not return any output, this is a finding.

Fix Text (F-78453r5_fix)
Add or update the following rule in "/etc/audit/rules.d/audit.rules" (removing those that do not match the CPU architecture): -a always,exit -F arch=b32 -S lchown -F auid>=1000 -F auid!=4294967295 -k perm_mod -a always,exit -F arch=b64 -S lchown -F auid>=1000 -F auid!=4294967295 -k perm_mod The audit daemon must be restarted for the changes to take effect.