| Finding ID |
Severity |
Title |
Description |
|
V-266261
|
High |
The F5 BIG-IP appliance 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 accidental leakage by restricting the traffic to only known sources and only those ports, protocols, or services that are permitted and operationally necessary.
As... |
|
V-266260
|
High |
The F5 BIG-IP appliance 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 those with little skill. Directions for the attack can be obtained on the internet and in hacker groups. Without filtering... |
|
V-266255
|
High |
The F5 BIG-IP appliance 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. |
Blocking or restricting detected harmful or suspicious communications between interconnected networks enforces approved authorizations for controlling the flow of traffic.
The firewall that filters traffic outbound to interconnected networks with different security policies must be configured with filters (e.g., rules, access control lists [ACLs], screens, and policies) that permit, restrict,... |
|
V-266267
|
Medium |
The BIG-IP appliance perimeter firewall must be configured to filter traffic destined to the enclave in accordance with the specific traffic that is approved and registered in the Ports, Protocols, and Services Management (PPSM) Category Assurance List (CAL) and vulnerability assessments. |
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 internally.
Vulnerability assessments must be reviewed by the system administrator (SA) and protocols must be approved by the IA staff before entering the... |
|
V-266266
|
Medium |
The F5 BIG-IP appliance must be configured to block all outbound management traffic. |
The management network must still have its own subnet to enforce control and access boundaries provided by Layer 3 network nodes such as routers and firewalls. Management traffic between the managed network elements and the management network is routed via the same links and nodes as that used for production... |
|
V-266265
|
Medium |
The F5 BIG-IP appliance must be configured to filter outbound traffic on all internal interfaces. |
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.
Access control policies and access control lists implemented on devices, such as firewalls, that control the flow of network traffic ensure the... |
|
V-266264
|
Medium |
The F5 BIG-IP appliance must be configured to filter inbound traffic on all external interfaces. |
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 network, which uses bandwidth and other resources.
Firewall filters control the flow of network traffic, ensure the flow of traffic is only... |
|
V-266263
|
Medium |
The F5 BIG-IP appliance 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. Inspection provides improved protection against application-based attacks by restricting the types of commands allowed for the applications. Application inspection all enforces conformance against published RFCs.... |
|
V-266259
|
Medium |
The F5 BIG-IP appliance must be configured to restrict itself 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 cyber attacks on third parties. This is a common practice in "botnets", which are a collection of compromised computers using malware to attack other computers or networks. Distributed denial-of-service (DDoS) attacks frequently leverage IP source... |
|
V-266258
|
Medium |
The F5 BIG-IP appliance 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. The use of TCP to transport log records to the log servers improves delivery... |
|
V-266256
|
Medium |
The F5 BIG-IP appliance must generate traffic log entries containing information to establish the details of the event, including success or failure of the application of the firewall rule. |
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 necessary to satisfy this requirement includes, for example, time stamps, source and destination addresses, user/process identifiers, event descriptions, success/fail... |
|
V-266254
|
Medium |
The F5 BIG-IP appliance 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 difficult at best.
Remote access is access to DOD nonpublic information systems by an authorized user (or an information system) communicating through an... |
|
V-266262
|
Low |
The F5 BIG-IP appliance must generate an alert that can be forwarded to, at a minimum, the information system security officer (ISSO) and information system security manager (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 generates an alert that notifies designated personnel of the Indicators of Compromise (IOCs), which require real-time alerts. These messages must... |
|
V-266257
|
Low |
In the event that communication with the central audit server is lost, the F5 BIG-IP appliance 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 errors, failures in the audit capturing mechanisms, and audit storage capacity being reached or exceeded. Responses to audit failure... |
