I - Mission Critical Classified
Rules and Groups employed by this XCCDF Profile
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SRG-NET-000019-FW-000004
Group -
The Cisco ASA 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 (P...Rule Medium Severity -
SRG-NET-000061-FW-000001
Group -
The Cisco ASA must be configured to restrict VPN traffic according to organization-defined filtering rules.
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 diffic...Rule Medium Severity -
SRG-NET-000074-FW-000009
Group -
The Cisco ASA must be configured to 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 neces...Rule Medium Severity -
SRG-NET-000075-FW-000010
Group -
The Cisco ASA must be configured to 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, ...Rule Medium Severity -
SRG-NET-000089-FW-000019
Group -
The Cisco ASA must be configured to queue log records locally in the event that the central audit server is down or not reachable.
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 ...Rule Medium Severity -
SRG-NET-000098-FW-000021
Group -
The Cisco ASA 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...Rule Medium Severity -
SRG-NET-000131-FW-000025
Group -
The Cisco ASA must be configured to 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 organiz...Rule Medium Severity -
SRG-NET-000193-FW-000030
Group -
The Cisco ASA must be configured to enable threat detection to mitigate risks 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 time...Rule Medium Severity -
SRG-NET-000205-FW-000040
Group -
The Cisco ASA 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 i...Rule Medium Severity -
SRG-NET-000333-FW-000014
Group -
The Cisco ASA must be configured to send log data of denied traffic to a central audit server for analysis.
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 to...Rule Medium Severity -
SRG-NET-000335-FW-000017
Group -
The Cisco ASA must be configured to generate a real-time alert to organization-defined personnel and/or the firewall administrator in the event communication with the central audit server is lost.
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 organ...Rule Medium Severity -
SRG-NET-000362-FW-000028
Group -
The Cisco ASA must be configured to implement scanning threat detection.
In a port scanning attack, an unauthorized application is used to scan the host devices for available services and open ports for subsequent use in an attack. This type of scanning can be used as a...Rule High Severity -
SRG-NET-000364-FW-000031
Group -
The Cisco ASA 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...Rule Medium Severity -
SRG-NET-000364-FW-000032
Group -
The Cisco ASA 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. A...Rule Medium Severity -
SRG-NET-000364-FW-000035
Group -
The Cisco ASA perimeter firewall must be configured to 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 t...Rule Medium Severity -
SRG-NET-000364-FW-000036
Group -
The Cisco ASA must be configured to forward management traffic to the Network Operations Center (NOC) via an IPsec tunnel.
When the production network is managed in-band, the management network could be housed at a NOC that is located remotely at single or multiple interconnected sites. NOC interconnectivity, as well a...Rule Medium Severity -
SRG-NET-000364-FW-000040
Group -
The Cisco ASA 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. Inspectio...Rule Medium Severity -
SRG-NET-000364-FW-000041
Group -
The Cisco ASA 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 c...Rule Medium Severity -
SRG-NET-000364-FW-000042
Group -
The Cisco ASA 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 computers...Rule Medium Severity -
SRG-NET-000392-FW-000042
Group -
The Cisco ASA must be configured to generate an alert that can be forwarded to organization-defined personnel and/or the firewall administrator 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 gen...Rule Medium Severity -
SRG-NET-000019-FW-000003
Group -
The Cisco ASA must be configured to filter outbound traffic, allowing only authorized ports and services.
Information flow control regulates where information is allowed to travel within a network and between interconnected networks. Blocking or restricting detected harmful or suspicious communications...Rule High Severity
Node 2
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