Intrusion Detection and Prevention Systems Security Requirements Guide
Rules, Groups, and Values defined within the XCCDF Benchmark
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SRG-NET-000705
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The IDPS must employ organization-defined controls by type of denial-of-service (DoS) to achieve the DoS objective.
DoS events may occur due to a variety of internal and external causes, such as an attack by an adversary or a lack of planning to support organizational needs with respect to capacity and bandwidth...Rule Medium Severity -
SRG-NET-000715
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The IDPS must implement physically or logically separate subnetworks to isolate organization-defined critical system components and functions.
Separating critical system components and functions from other noncritical system components and functions through separate subnetworks may be necessary to reduce susceptibility to a catastrophic o...Rule Medium Severity -
SRG-NET-000760
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The IDPS must establish organization-defined alternate communications paths for system operations organizational command and control.
An incident, whether adversarial- or nonadversarial-based, can disrupt established communications paths used for system operations and organizational command and control. Alternate communications p...Rule Medium Severity -
The IDPS must enforce approved authorizations by restricting or blocking the flow of harmful or suspicious communications traffic within the network as defined in the PPSM CAL and vulnerability assessments.
The flow of all communications traffic must be monitored and controlled so it does not introduce any unacceptable risk to the network infrastructure or data. Restricting the flow of communications...Rule Medium Severity -
The IDPS must immediately use updates made to policy filters, rules, signatures, and anomaly analysis algorithms for traffic detection and prevention functions.
Information flow policies regarding dynamic information flow control include, for example, allowing or disallowing information flows based on changes to the PPSM CAL, vulnerability assessments, or ...Rule Medium Severity -
The IDPS must produce audit records containing sufficient information to establish what type of event occurred, including, at a minimum, event descriptions, policy filter, rule or signature invoked, port, protocol, and criticality level/alert code or description.
Without establishing what type of event occurred, it would be difficult to establish, correlate, and investigate the events leading up to an outage or attack. Associating an event type with each ev...Rule Medium Severity -
The IDPS must produce audit records containing information to establish where the event was detected, including, at a minimum, network segment, destination address, and IDPS component which detected the event.
Associating where the event was detected with the event log entries provides a means of investigating an attack or identifying an improperly configured IDPS. This information can be used to determi...Rule Medium Severity -
The IDPS must produce audit records containing information to establish the outcome of events associated with detected harmful or potentially harmful traffic, including, at a minimum, capturing all associated communications traffic.
Associating event outcome with detected events in the log provides a means of investigating an attack or suspected attack. While auditing and logging are closely related, they are not the same. Lo...Rule Medium Severity -
The IDPS must provide audit record generation capability for detection events based on implementation of policy filters, rules, signatures, and anomaly analysis.
Without the capability to generate audit records, it would be difficult to establish, correlate, and investigate the events relating to an incident, or identify those responsible for one. While au...Rule Medium Severity -
The IDPS must be configured to prohibit or restrict the use of functions, ports, protocols, and/or services, as defined in the PPSM CAL and vulnerability assessments.
Some ports, protocols, or services have known exploits or security weaknesses. These ports, protocols, and services must be prohibited or restricted in the IDPS configuration in accordance with DoD...Rule Medium Severity -
The IDPS must block outbound traffic containing known and unknown DoS attacks by ensuring that security policies, signatures, rules, and anomaly detection techniques are applied to outbound communications traffic.
The IDPS must include protection against DoS attacks that originate from inside the enclave which can affect either internal or external systems. These attacks may use legitimate or rogue endpoints...Rule Medium Severity -
The IDPS must block any prohibited mobile code at the enclave boundary when it is detected.
Mobile code is defined as software modules obtained from remote systems, transferred across a network, and then downloaded and executed on a local system without explicit installation or execution ...Rule Medium Severity -
The IDPS must fail to a secure state which maintains access control mechanisms when the IDPS hardware, software, or firmware fails on initialization/shutdown or experiences a sudden abort during normal operation.
Failure to a known safe state helps prevent systems from failing to a state that may cause loss of data or unauthorized access to system resources. Preserving information system state information a...Rule Medium Severity -
In the event of a failure of the IDPS function, the IDPS must save diagnostic information, log system messages, and load the most current security policies, rules, and signatures when restarted.
Failure in a secure state address safety or security in accordance with the mission needs of the organization. Failure to a secure state helps prevent a loss of confidentiality, integrity, or avail...Rule Medium Severity -
The IDPS must automatically update malicious code protection mechanisms as new releases are available in accordance with organizational configuration management procedures.
Failing to update malicious code protection mechanisms, including application software files, signature definitions, and vendor-provided rules, leaves the system vulnerable to exploitation by recen...Rule Medium Severity -
The IDPS must perform real-time monitoring of files from external sources at network entry/exit points.
Real-time monitoring of files from external sources at network entry/exit points helps to detect covert malicious code before it is downloaded to or executed by internal and external endpoints. Usi...Rule Medium Severity -
The IDPS must quarantine and/or delete malicious code.
Configuring the network element to delete and/or quarantine based on local organizational incident handling procedures minimizes the impact of this code on the network. Malicious code includes, bu...Rule Medium Severity
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