Check: UBTU-16-020560
Canonical Ubuntu STIG:
UBTU-16-020560
(in version v1 r2)
Title
Successful/unsuccessful uses of the chmod command must generate an audit record. (Cat II impact)
Discussion
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-000037-GPOS-00015, SRG-OS-000042-GPOS-00020, SRG-OS-000062-GPOS-00031, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215
Check Content
Verify the Ubuntu operating system generates an audit record when successful/unsuccessful attempts to use the "chmod" command occur. Check that the following calls are being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": # sudo grep -w chmod /etc/audit/audit.rules -a always,exit -F arch=b64 -S chmod -F auid>=1000 -F auid!=4294967295 -k perm_chng If the command does not return a line, or the line is commented out, this is a finding.
Fix Text
Configure the audit system to generate an audit event for any successful/unsuccessful use of the "chmod" command by adding the following line to "/etc/audit/audit.rules": -a always,exit -F arch=b64 -S chmod -F auid>=1000 -F auid!=4294967295 -k perm_chng The audit daemon must be restarted for the changes to take effect. To restart the audit daemon, run the following command: # sudo systemctl restart auditd.service
Additional Identifiers
Rule ID: SV-90417r3_rule
Vulnerability ID: V-75737
Group Title:
Expert Comments
CCIs
| Number | Definition |
|---|---|
| CCI-000130 |
The information system generates audit records containing information that establishes what type of event occurred. |
| CCI-000135 |
The information system generates audit records containing the organization-defined additional, more detailed information that is to be included in the audit records. |
| CCI-000169 |
The information system provides audit record generation capability for the auditable events defined in AU-2 a. at organization-defined information system components. |
| CCI-000172 |
The information system generates audit records for the events defined in AU-2 d. with the content defined in AU-3. |
| CCI-002884 |
The organization audits nonlocal maintenance and diagnostic sessions^ organization-defined audit events. |