Check: SLEM-05-654155
SUSE Linux Enterprise Micro (SLEM) 5 STIG:
SLEM-05-654155
(in version v1 r1)
Title
SLEM 5 must generate audit records for all uses of the "chown", "fchown", "fchownat", and "lchown" system calls. (Cat II impact)
Discussion
Without generating audit records 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). The system call rules are loaded into a matching engine that intercepts each syscall made by all programs on the system. Therefore, it is very important to use syscall rules only when absolutely necessary, since these affect performance. The more rules, the bigger the performance hit. The performance can be helped, however, by combining syscalls into one rule whenever possible.
Check Content
Verify SLEM 5 generates an audit record for all uses of the "chown", "fchown", "fchownat", and "lchown" system calls with the following command: > sudo auditctl -l | grep chown -a always,exit -F arch=b32 -S chown,fchown,fchownat,lchown -F auid>=1000 -F auid!=-1 -F key=perm_mod -a always,exit -F arch=b64 -S chown,fchown,fchownat,lchown -F auid>=1000 -F auid!=-1 -F key=perm_mod If both the "b32" and "b64" audit rules are not defined for the "chown", "fchown", "fchownat", and "lchown" syscalls, this is a finding. Note: The "key=" value is arbitrary and can be different from the example output above.
Fix Text
Configure SLEM 5 to generate an audit record for all uses of the "chown", "fchown", "fchownat", and "lchown" system calls. Add or modify the following lines in the "/etc/audit/rules.d/audit.rules" file: -a always,exit -F arch=b32 -S chown,fchown,fchownat,lchown -F auid>=1000 -F auid!=unset -k perm_mod -a always,exit -F arch=b64 -S chown,fchown,fchownat,lchown -F auid>=1000 -F auid!=unset -k perm_mod To reload the rules file, restart the audit daemon: > sudo systemctl restart auditd.service or issue the following command: > sudo augenrules --load
Additional Identifiers
Rule ID: SV-261454r996769_rule
Vulnerability ID: V-261454
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-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. |