From Oracle Database 12c Security Technical Implementation Guide
Part of SRG-APP-000109-DB-000049
Associated with: CCI-000366
It is critical when a system is at risk of failing to process audit logs as required; it detects and takes action to mitigate the failure. Audit processing failures include: software/hardware errors, failures in the audit capturing mechanisms, and audit storage capacity being reached or exceeded. Applications are required to be capable of either directly performing or calling system-level functionality performing defined actions upon detection of an application audit log processing failure.
Review the procedures, manual and/or automated, for monitoring the space used by audit trail(s) and for off-loading audit records to a centralized log management system. If the procedures do not exist, this is a finding. If the procedures exist, request evidence that they are followed. If the evidence indicates that the procedures are not followed, this is a finding. If the procedures exist, inquire if the system has ever run out of audit trail space in the last two years or since the last system upgrade, whichever is more recent. If it has run out of space in this period, and the procedures have not been updated to compensate, this is a finding.
Modify DBMS, OS, or third-party logging application settings to alert appropriate personnel when a specific percentage of log storage capacity is reached. For ease of management, it is recommended that the audit tables be kept in a dedicated tablespace. If Oracle Enterprise Manager is in use, the capability to issue such an alert is built in and configurable via the console so an email can be sent to a designated administrator. If Enterprise Manager is unavailable, the following script can be used to monitor storage space; this can be combined with additional code to email the appropriate administrator so they can take action. sqlplus connect as sysdba set pagesize 300 set linesize 120 column sumb format 9,999,999,999,999 column extents format 999999 column bytes format 9,999,999,999,999 column largest format 9,999,999,999,999 column Tot_Size format 9,999,999,999,999 column Tot_Free format 9,999,999,999,999 column Pct_Free format 9,999,999,999,999 column Chunks_Free format 9,999,999,999,999 column Max_Free format 9,999,999,999,999 set echo off spool TSINFO.txt PROMPT SPACE AVAILABLE IN TABLESPACES select a.tablespace_name,sum(a.tots) Tot_Size, sum(a.sumb) Tot_Free, sum(a.sumb)*100/sum(a.tots) Pct_Free, sum(a.largest) Max_Free,sum(a.chunks) Chunks_Free from ( select tablespace_name,0 tots,sum(bytes) sumb, max(bytes) largest,count(*) chunks from dba_free_space a group by tablespace_name union select tablespace_name,sum(bytes) tots,0,0,0 from dba_data_files group by tablespace_name) a group by a.tablespace_name; Sample Output SPACE AVAILABLE IN TABLESPACES TABLESPACE_NAME TOT_SIZE TOT_FREE PCT_FREE MAX_FREE CHUNKS_FREE ------------------------------ ------------ ------------ ------------ ------------ ------------ DES2 41,943,040 30,935,040 74 30,935,040 1 DES2_I 31,457,280 23,396,352 74 23,396,352 1 RBS 60,817,408 57,085,952 94 52,426,752 16 SYSTEM 94,371,840 5,386,240 6 5,013,504 3 TEMP 563,200 561,152 100 133,120 5 TOOLS 120,586,240 89,407,488 74 78,190,592 12 USERS 1,048,576 26,624 3 26,624 1
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