O121-C2-008200 - The DBMS itself, or the logging or alerting mechanism the application utilizes, must provide a warning when allocated audit record storage volume reaches an organization-defined percentage of maximum audit record storage capacity.

Information

It is critical for the appropriate personnel to be aware if a system is at risk of failing to process audit logs as required. Audit processing failures include: software/hardware errors, failures in the audit capturing mechanisms, and audit storage capacity being reached or exceeded.

If audit log capacity were to be exceeded, then events subsequently occurring would not be recorded. Organizations shall define a maximum allowable percentage of storage capacity serving as an alarming threshold (e.g., application has exceeded 80% of log storage capacity allocated) at which time the application or the logging mechanism the application utilizes will provide a warning to the appropriate personnel.

A failure of database auditing will result in either the database continuing to function without auditing or in a complete halt to database operations. When audit processing fails, appropriate personnel must be alerted immediately to avoid further downtime or unaudited transactions. This can be an alert provided by the database, a log repository, or the OS when a designated log directory is nearing capacity.

NOTE: Nessus has not performed this check. Please review the benchmark to ensure target compliance.

Solution

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

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_Oracle_Database_12c_V2R8_STIG.zip

Item Details

Category: AUDIT AND ACCOUNTABILITY

References: 800-53|AU-5(1), CAT|II, CCI|CCI-001855, Rule-ID|SV-237717r879732_rule, STIG-ID|O121-C2-008200, STIG-Legacy|SV-76133, STIG-Legacy|V-61643, Vuln-ID|V-237717

Plugin: OracleDB

Control ID: 8960450c8fb8f444f565b99f0592715b3060ce005a94a1eb69adff2f2e73bb87