Check: UBTU-16-020500
Canonical Ubuntu STIG:
UBTU-16-020500
(in version v1 r2)
Title
The audit system must be configured to audit any usage of the lremovexattr system call. (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-000458-GPOS-00203, SRG-OS-000462-GPOS-00206, SRG-OS-000463-GPOS-00207, SRG-OS-000471-GPOS-00215, SRG-OS-000474-GPOS-00219
Check Content
Verify if the Ubuntu operating system is configured to audit the execution of the "lremovexattr" system call, by running the following command: # sudo grep -w lremovexattr /etc/audit/audit.rules -a always,exit -F arch=b32 -S lremovexattr -F auid>=1000 -F auid!=4294967295 -k perm_mod -a always,exit -F arch=b64 -S lremovexattr -F auid>=1000 -F auid!=4294967295 -k perm_mod -a always,exit -F arch=b32 -S lremovexattr -F auid=0 -k perm_mod -a always,exit -F arch=b64 -S lremovexattr -F auid=0 -k perm_mod If the command does not return all lines, or the lines are commented out, this is a finding.
Fix Text
Configure the Ubuntu operating system to audit the execution of the "lremovexattr" system call, by adding the following lines to "/etc/audit/audit.rules": -a always,exit -F arch=b32 -S lremovexattr -F auid>=1000 -F auid!=4294967295 -k perm_mod -a always,exit -F arch=b64 -S lremovexattr -F auid>=1000 -F auid!=4294967295 -k perm_mod -a always,exit -F arch=b32 -S lremovexattr -F auid=0 -k perm_mod -a always,exit -F arch=b64 -S lremovexattr -F auid=0 -k perm_mod 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-90405r3_rule
Vulnerability ID: V-75725
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. |