The DBMS must protect against or limit the effects of organization-defined types of Denial of Service (DoS) attacks.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-61783	O121-C2-019100	SV-76273r1_rule		Medium

Description
A variety of technologies exist to limit, or in some cases, eliminate the effects of DoS attacks. For example, boundary protection devices can filter certain types of packets to protect devices on an organization's internal network from being directly affected by DoS attacks. Employing increased capacity and bandwidth combined with service redundancy may reduce the susceptibility to some DoS attacks. Some of the ways databases can limit their exposure to DoS attacks are through limiting the number of connections that can be opened by a single user and database clustering.

Description

A variety of technologies exist to limit, or in some cases, eliminate the effects of DoS attacks. For example, boundary protection devices can filter certain types of packets to protect devices on an organization's internal network from being directly affected by DoS attacks. Employing increased capacity and bandwidth combined with service redundancy may reduce the susceptibility to some DoS attacks. Some of the ways databases can limit their exposure to DoS attacks are through limiting the number of connections that can be opened by a single user and database clustering.

STIG	Date
Oracle Database 12c Security Technical Implementation Guide	2018-09-18

Details

Check Text ( C-62661r1_chk )
Review DBMS settings to verify the DBMS implements measures to limit the effects of the organization-defined types of Denial of Service (DoS) attacks. If measures have not been implemented, this is a finding. Check the $ORACLE_HOME/network/admin/listener.ora to see if a Rate Limit has been established. A rate limit is used to prevent denial of service (DOS) attacks on a database or to control a logon storm such as may be caused by an application server reboot. - - - - - Example of a listener configuration with rate limiting in effect: CONNECTION_RATE_LISTENER=10 LISTENER= (ADDRESS_LIST= (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521)(RATE_LIMIT=yes)) (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1522)(RATE_LIMIT=yes)) (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1526)) ) LISTENER= (ADDRESS_LIST= (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521)(RATE_LIMIT=8)) (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1522)(RATE_LIMIT=12)) (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1526)) )

Check Text ( C-62661r1_chk )

Review DBMS settings to verify the DBMS implements measures to limit the effects of the organization-defined types of Denial of Service (DoS) attacks.

If measures have not been implemented, this is a finding.

Check the $ORACLE_HOME/network/admin/listener.ora to see if a Rate Limit has been established. A rate limit is used to prevent denial of service (DOS) attacks on a database or to control a logon storm such as may be caused by an application server reboot.

- - - - -
Example of a listener configuration with rate limiting in effect:

CONNECTION_RATE_LISTENER=10

LISTENER=
(ADDRESS_LIST=
(ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521)(RATE_LIMIT=yes))
(ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1522)(RATE_LIMIT=yes))
(ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1526))
)
LISTENER=
(ADDRESS_LIST=
(ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521)(RATE_LIMIT=8))
(ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1522)(RATE_LIMIT=12))
(ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1526))
)

Fix Text (F-67699r1_fix)
Implement measures to limit the effects of organization-defined types of Denial of Service attacks. Modify the $ORACLE_HOME/network/admin/listener.ora to establish a Rate Limit.