Check: UBTU-16-020460
Canonical Ubuntu 16.04 LTS STIG:
UBTU-16-020460
(in versions v2 r3 through v2 r2)
Title
The audit system must be configured to audit any usage of the setxattr 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-000462-GPOS-00206, SRG-OS-000471-GPOS-00215
Check Content
Verify if the Ubuntu operating system is configured to audit the execution of the "setxattr" system call, by running the following command: # sudo grep -w setxattr /etc/audit/audit.rules -a always,exit -F arch=b32 -S setxattr -F auid>=1000 -F auid!=4294967295 -k perm_mod -a always,exit -F arch=b64 -S setxattr -F auid>=1000 -F auid!=4294967295 -k perm_mod -a always,exit -F arch=b32 -S setxattr -F auid=0 -k perm_mod -a always,exit -F arch=b64 -S setxattr -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 "setxattr" system call, by adding the following lines to "/etc/audit/audit.rules": -a always,exit -F arch=b32 -S setxattr -F auid>=1000 -F auid!=4294967295 -k perm_mod -a always,exit -F arch=b64 -S setxattr -F auid>=1000 -F auid!=4294967295 -k perm_mod -a always,exit -F arch=b32 -S setxattr -F auid=0 -k perm_mod -a always,exit -F arch=b64 -S setxattr -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-215068r610931_rule
Vulnerability ID: V-215068
Group Title: SRG-OS-000037-GPOS-00015
Expert Comments
CCIs
| Number | Definition |
|---|---|
| CCI-000130 |
Ensure that audit records contain information that establishes what type of event occurred. |
| CCI-000135 |
Generate audit records containing the organization-defined additional information that is to be included in the audit records. |
| CCI-000169 |
Provide audit record generation capability for the event types the system is capable of auditing as defined in AU-2 a on organization-defined information system components. |
| CCI-000172 |
Generate audit records for the event types defined in AU-2 c that include the audit record content defined in AU-3. |
| CCI-002884 |
Log organization-defined audit events for nonlocal maintenance and diagnostic sessions. |