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SI-15

SI-15: Information Output Filtering

The information system validates information output from [organization-defined software programs and/or applications] to ensure that the information is consistent with the expected content.

Supplemental

Certain types of cyber attacks (e.g., SQL injections) produce output results that are unexpected or inconsistent with the output results that would normally be expected from software programs or applications. This control enhancement focuses on detecting extraneous content, preventing such extraneous content from being displayed, and alerting monitoring tools that anomalous behavior has been discovered.

CIA Levels
Confidentiality	unknown
Integrity	high
Availability	unknown

Overlays
NC3

CSF Categories
None

Related Controls

The controls below (if any) were marked by NIST as being related to SI-15.

Control	Description
SI-3	The organization: a: Employs malicious code protection mechanisms at information system entry and exit points to detect and eradicate malicious code; b: Updates malicious code protection mechanisms whenever new releases are available in accordance with organizational configuration management policy and procedures; c: Configures malicious code protection mechanisms to: 1: Perform periodic scans of the information system [organization-defined frequency] and real-time scans of files from external sources at [one or more of endpoint/network entry/exit points] as the files are downloaded, opened, or executed in accordance with organizational security policy; and 2: [one or more of block malicious code/quarantine malicious code/send alert to administrator/ {{ insert: param, si-3_prm_4 }} ] in response to malicious code detection; and d: Addresses the receipt of false positives during malicious code detection and eradication and the resulting potential impact on the availability of the information system.
SI-4	The organization: a: Monitors the information system to detect: 1: Attacks and indicators of potential attacks in accordance with [organization-defined monitoring objectives]; and 2: Unauthorized local, network, and remote connections; b: Identifies unauthorized use of the information system through [organization-defined techniques and methods]; c: Deploys monitoring devices: 1: Strategically within the information system to collect organization-determined essential information; and 2: At ad hoc locations within the system to track specific types of transactions of interest to the organization; d: Protects information obtained from intrusion-monitoring tools from unauthorized access, modification, and deletion; e: Heightens the level of information system monitoring activity whenever there is an indication of increased risk to organizational operations and assets, individuals, other organizations, or the Nation based on law enforcement information, intelligence information, or other credible sources of information; f: Obtains legal opinion with regard to information system monitoring activities in accordance with applicable federal laws, Executive Orders, directives, policies, or regulations; and g: Provides [organization-defined information system monitoring information] to [organization-defined personnel or roles] [one or more of as needed/ {{ insert: param, si-4_prm_6 }} ].

Control

Description

SI-3

The organization:

a: Employs malicious code protection mechanisms at information system entry and exit points to detect and eradicate malicious code;

b: Updates malicious code protection mechanisms whenever new releases are available in accordance with organizational configuration management policy and procedures;

c: Configures malicious code protection mechanisms to:
- 1: Perform periodic scans of the information system [organization-defined frequency] and real-time scans of files from external sources at [one or more of endpoint/network entry/exit points] as the files are downloaded, opened, or executed in accordance with organizational security policy; and
- 2: [one or more of block malicious code/quarantine malicious code/send alert to administrator/ {{ insert: param, si-3_prm_4 }} ] in response to malicious code detection; and

d: Addresses the receipt of false positives during malicious code detection and eradication and the resulting potential impact on the availability of the information system.

SI-4

The organization:

a: Monitors the information system to detect:
- 1: Attacks and indicators of potential attacks in accordance with [organization-defined monitoring objectives]; and
- 2: Unauthorized local, network, and remote connections;

b: Identifies unauthorized use of the information system through [organization-defined techniques and methods];

c: Deploys monitoring devices:
- 1: Strategically within the information system to collect organization-determined essential information; and
- 2: At ad hoc locations within the system to track specific types of transactions of interest to the organization;

d: Protects information obtained from intrusion-monitoring tools from unauthorized access, modification, and deletion;

e: Heightens the level of information system monitoring activity whenever there is an indication of increased risk to organizational operations and assets, individuals, other organizations, or the Nation based on law enforcement information, intelligence information, or other credible sources of information;

f: Obtains legal opinion with regard to information system monitoring activities in accordance with applicable federal laws, Executive Orders, directives, policies, or regulations; and

g: Provides [organization-defined information system monitoring information] to [organization-defined personnel or roles] [one or more of as needed/ {{ insert: param, si-4_prm_6 }} ].

Enhancements

The controls below (if any) add on to the requirements of SI-15.

Control	Description
No controls

Related CCIs

The CCIs below are tied to SI-15.

CCI	Definition
CCI-002770	Defines the software programs and/or applications from which the system is to validate the information output to ensure the information is consistent with expected content.
CCI-002771	Validate information output from organization-defined software programs and/or applications to ensure that the information is consistent with the expected content.
CCI-002772	The organization defines the security safeguards to be implemented to protect the information system's memory from unauthorized code execution.