| V-79413 | 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-79415 | High | The firewall must be configured to use 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. | 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-79409 | 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-79443 | 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-79447 | 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-79445 | 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-79449 | Medium | The firewall must be configured to send a real-time alert to the ISSO and SA (at a minimum) in the event of an audit processing failure on the firewall itself. | It is critical for the appropriate personnel to be aware if a system is at risk of failing to process traffic logs as required. Without this notification, the security personnel may be unaware of... |
| V-79425 | Medium | The firewall that filters traffic from the wireless 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-79427 | 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-79421 | 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-79423 | 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-79461 | 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-79463 | Medium | The firewall must fail to a secure state if the firewall filtering functions fail unexpectedly. | Firewalls that fail suddenly and with no incorporated failure state planning may leave the hosting system available but with a reduced security protection. Failure to a known safe state helps... |
| V-79431 | 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-79465 | 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-79467 | Medium | The perimeter firewall must be configured for service redundancy, load balancing, or other organization-defined safeguards to limit the effects of types of denial-of-service (DoS) attacks on the network. | As a critical security system, perimeter firewalls must be safeguarded with redundancy measures. If the network does not provide safeguards against DoS attacks, network resources will be... |
| V-79429 | 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-79439 | 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-79455 | Medium | The firewall must protect traffic log records from unauthorized read access while stored locally. | Auditing and logging are key components of any security architecture. Logging the actions of specific events provides a means to investigate an attack, recognize resource utilization or capacity... |
| V-79457 | 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-79451 | 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-79453 | Medium | The firewall must protect traffic log records from unauthorized access while in transit to the central audit server. | Auditing and logging are key components of any security architecture. Logging the actions of specific events provides a means to investigate an attack, recognize resource utilization or capacity... |
| V-79459 | 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-79437 | 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-79435 | 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-79417 | Medium | The firewall must be configured to prohibit or restrict the use of functions, ports, protocols, and/or services on the network segment in accordance as defined in the Ports, Protocols, and Services Management (PPSM) CAL and vulnerability assessments. | Some ports, protocols, or services have well-known exploits or security weaknesses that can be leveraged in an attack against the enclave and put it at immediate risk. These ports, protocols, and... |
| V-79473 | Medium | The firewall must establish ingress filters that block inbound packets where the destination is an IP address assigned to the management or loopback addresses of the enclave protection devices unless the packet has a source address assigned to the management network or network infrastructure. | The firewall must reject requests for access or services where the source address received by the firewall specifies a loopback address. The loopback address is used by an Inter-Processor Control... |
| V-79471 | 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 prevented.... |
| V-79477 | 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-79475 | Medium | The firewall must block or restrict inbound IP packets destined to the control plane of the firewall itself. | As a critical security system, perimeter firewalls must be safeguarded against direct attacks to the device. The firewall must have a filter that rejects requests for access or services where the... |
| V-79411 | Medium | The firewall must fail closed if the firewall filtering function is nonfunctional. | While failure to an open state may ensure users are not inconvenienced, it also circumvents a critical security network function that guards against direct and indirect network attacks. Allow... |
| V-79469 | 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-79479 | 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-79485 | 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-79483 | Medium | The firewall must be configured to fail securely in the event of an operational failure of the firewall filtering or boundary protection function. | If a boundary protection device fails in an unsecure manner (open), information external to the boundary protection device may enter, or the device may permit unauthorized information... |
| V-79481 | Medium | The firewall must block outbound IP packets that contain illegitimate packet attributes including, at a minimum, invalid source address or packets that fail minimum length tests (TCP length, UDP length, IP data length) that have undefined protocol numbers, improper use of hop-by-hop header, or IPv6 RH0 header. | If outbound communications traffic is not filtered, hostile activity intended to harm other networks may not be detected and prevented. |
| V-79433 | Medium | The firewall must be configured to allow authorized users to record a packet capture based IP, traffic type (TCP, UDP, or ICMP), or protocol. | Without the ability to capture, record, and log content related to a user session, investigations into suspicious user activity would be hampered.
This configuration ensures the ability to select... |
| V-79419 | 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-79441 | 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-79487 | Low | The firewall must be configured to allow the system administrator to select a subset of DoD-required auditable events. | The generation of logs with a subset of criteria aide the system administrator, maintainers, and auditors when troubleshooting issues or reviewing the log for trends or security breaches.... |
| V-79489 | 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... |
