| V-206701 | High | The firewall must employ filters that prevent or limit the effects of all types of commonly known denial-of-service (DoS) attacks, including flooding, packet sweeps, and unauthorized port scanning. | Not configuring a key boundary security protection device such as the firewall against commonly known attacks is an immediate threat to the protected enclave because they are easily implemented by... |
| V-206674 | High | The firewall must be configured to use filters that use packet headers and packet attributes, including source and destination IP addresses and ports, to prevent the flow of unauthorized or suspicious traffic between interconnected networks with different security policies (including perimeter firewalls and server VLANs). | Information flow control regulates where information is allowed to travel within a network and between interconnected networks. Blocking or restricting detected harmful or suspicious... |
| V-206694 | High | The firewall must deny network communications traffic by default and allow network communications traffic by exception (i.e., deny all, permit by exception). | To prevent malicious or accidental leakage of traffic, organizations must implement a deny-by-default security posture at the network perimeter. Such rulesets prevent many malicious exploits or... |
| V-206708 | Medium | The firewall must restrict traffic entering the VPN tunnels to the management network to only the authorized management packets based on destination address. | Protect the management network with a filtering firewall configured to block unauthorized traffic. This requirement is similar to the out-of-band management (OOBM) model, when the production... |
| V-206704 | Medium | The firewall must apply egress filters to traffic that is outbound from the network through any internal interface. | If outbound communications traffic is not filtered, hostile activity intended to harm other networks or packets from networks destined to unauthorized networks may not be detected and... |
| V-206707 | Medium | The premise firewall (located behind the premise router) must block all outbound management traffic. | The management network must still have its own subnet in order to enforce control and access boundaries provided by Layer 3 network nodes such as routers and firewalls. Management traffic between... |
| V-206700 | Medium | If communication with the central audit server is lost, the firewall must generate a real-time alert to, at a minimum, the SCA and ISSO. | Without a real-time alert (less than a second), security personnel may be unaware of an impending failure of the audit functions and system operation may be adversely impacted. Alerts provide... |
| V-206703 | Medium | The firewall must apply ingress filters to traffic that is inbound to the network through any active external interface. | Unrestricted traffic to the trusted networks may contain malicious traffic that poses a threat to an enclave or to other connected networks. Additionally, unrestricted traffic may transit a... |
| V-206692 | Medium | The firewall must block outbound traffic containing denial-of-service (DoS) attacks to protect against the use of internal information systems to launch any DoS attacks against other networks or endpoints. | DoS attacks can take multiple forms but have the common objective of overloading or blocking a network or host to deny or seriously degrade performance. If the network does not provide safeguards... |
| V-223011 | Medium | The firewall must be configured to inspect all inbound and outbound traffic at the application layer. | Application inspection enables the firewall to control traffic based on different parameters that exist within the packets such as enforcing application-specific message and field length.... |
| V-206688 | Medium | The firewall must protect the traffic log from unauthorized deletion of local log files and log records. | If audit data were to become compromised, forensic analysis and discovery of the true source of potentially malicious system activity would be impossible to achieve.
To ensure the veracity of... |
| V-223013 | Medium | The firewall must be configured to restrict it from accepting outbound packets that contain an illegitimate address in the source address field via an egress filter or by enabling Unicast Reverse Path Forwarding (uRPF). | A compromised host in an enclave can be used by a malicious platform to launch cyberattacks on third parties. This is a common practice in "botnets", which are a collection of compromised... |
| V-206693 | Medium | The firewall implementation must manage excess bandwidth to limit the effects of packet flooding types of denial-of-service (DoS) attacks. | A firewall experiencing a DoS attack will not be able to handle production traffic load. The high utilization and CPU caused by a DoS attack will also have an effect on control keep-alives and... |
| V-206685 | Medium | The firewall must be configured to use TCP when sending log records to the central audit server. | If the default UDP protocol is used for communication between the hosts and devices to the Central Log Server, then log records that do not reach the log server are not detected as a data loss.... |
| V-206684 | Medium | In the event that communication with the central audit server is lost, the firewall must continue to queue traffic log records locally. | It is critical that when the network element is at risk of failing to process traffic logs as required, it takes action to mitigate the failure. Audit processing failures include software/hardware... |
| V-206687 | Medium | The firewall must protect the traffic log from unauthorized modification of local log records. | If audit data were to become compromised, forensic analysis and discovery of the true source of potentially malicious system activity would be impossible to achieve.
To ensure the veracity of... |
| V-206680 | Medium | The firewall must generate traffic log entries containing information to establish the location on the network where the events occurred. | Without establishing where events occurred, it is impossible to establish, correlate, and investigate the events leading up to an outage or attack.
In order to compile an accurate risk assessment... |
| V-206682 | Medium | The firewall must generate traffic log entries containing information to establish the outcome of the events, such as, at a minimum, the success or failure of the application of the firewall rule. | Without information about the outcome of events, security personnel cannot make an accurate assessment as to whether an attack was successful or if changes were made to the security state of the... |
| V-206714 | Medium | The firewall must generate traffic log records when attempts are made to send packets between security zones that are not authorized to communicate. | Without generating log records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-206713 | Medium | The firewall must generate traffic log records when traffic is denied, restricted, or discarded. | Without generating log records that log usage of objects by subjects and other objects, it would be difficult to establish, correlate, and investigate the events relating to an incident or... |
| V-206698 | Medium | In the event of a system failure of the firewall function, the firewall must be configured to save diagnostic information, log system messages, and load the most current security policies, rules, and signatures when restarted. | Failure to a secure state can 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... |
| V-206699 | Medium | The firewall must be configured to send traffic log entries to a central audit server for management and configuration of the traffic log entries. | Without the ability to centrally manage the content captured in the traffic log entries, identification, troubleshooting, and correlation of suspicious behavior would be difficult and could lead... |
| V-206675 | Medium | The firewall must immediately use updates made to policy enforcement mechanisms such as firewall rules, security policies, and security zones. | Information flow policies regarding dynamic information flow control include, for example, allowing or disallowing information flows based on changes to the Ports, Protocols, Services Management... |
| V-206676 | Medium | The firewall that filters traffic from the VPN access points must be configured with organization-defined filtering rules that apply to the monitoring of remote access traffic. | Remote access devices (such as those providing remote access to network devices and information systems) that lack automated capabilities increase risk and make remote user access management... |
| V-206678 | Medium | The firewall must generate traffic log entries containing information to establish what type of events occurred. | 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.
Audit event content that may be... |
| V-206679 | Medium | The firewall must generate traffic log entries containing information to establish when (date and time) the events occurred. | Without establishing when events occurred, it is impossible to establish, correlate, and investigate the events leading up to an outage or attack.
In order to compile an accurate risk assessment,... |
| V-206690 | Medium | The firewall must disable or remove unnecessary network services and functions that are not used as part of its role in the architecture. | Network devices are capable of providing a wide variety of functions (capabilities or processes) and services. Some of these functions and services are installed and enabled by default. The... |
| V-206696 | Medium | The firewall must fail to a secure state upon the failure of the following: system initialization, shutdown, or system abort. | 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. Network elements that fail suddenly and with no... |
| V-206695 | Medium | The perimeter firewall must filter traffic destined to the internal enclave in accordance with the specific traffic that is approved and registered in the Ports, Protocols, and Services Management (PPSM) Category Assurance List (CAL), Vulnerability Assessments (VAs) for that the enclave. | The enclave's internal network contains the servers where mission-critical data and applications reside. Malicious traffic can enter from an external boundary or originate from a compromised host... |
| V-263647 | Medium | The firewall must be configured to 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... |
| V-223012 | Medium | The firewall must be configured to inspect all inbound and outbound IPv6 traffic for unknown or out-of-order extension headers. | IPv6 packets with unknown extension headers as well as out-of-order headers can create denial-of-service attacks for other networking components as well as host devices. IPv6 inspection can check... |
| V-263648 | Medium | The firewall must be configured to 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... |
| V-263649 | Medium | The firewall must be configured to 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... |
| V-206681 | Low | The firewall must generate traffic log entries containing information to establish the source of the events, such as the source IP address at a minimum. | Without establishing the source of the event, it is impossible to establish, correlate, and investigate the events leading up to an outage or attack. In order to compile an accurate risk... |
| V-206711 | Low | The firewall must generate an alert that can be forwarded to, at a minimum, the ISSO and ISSM when denial-of-service (DoS) incidents are detected. | Without an alert, security personnel may be unaware of major detection incidents that require immediate action, and this delay may result in the loss or compromise of information.
The firewall... |
