II - Mission Support Classified
Rules and Groups employed by this XCCDF Profile
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SRG-NET-000041-VPN-000110
Group -
The ICS must display the Standard Mandatory DOD Notice and Consent Banner before granting access to users.
Display of the DOD-approved use notification before granting access to the network device ensures privacy and security notification verbiage used is consistent with applicable federal laws, Executi...Rule Medium Severity -
SRG-NET-000053-VPN-000170
Group -
The ICS must be configured to limit the number of concurrent sessions for user accounts to one.
VPN gateway management includes the ability to control the number of users and user sessions that utilize a VPN gateway. Limiting the number of allowed users and sessions per user is helpful in lim...Rule Medium Severity -
SRG-NET-000062-VPN-000200
Group -
The ICS must be configured to use TLS 1.2, at a minimum.
Using older unauthorized versions or incorrectly configuring protocol negotiation makes the gateway vulnerable to known and unknown attacks that exploit vulnerabilities in this protocol. NIST SP 8...Rule High Severity -
SRG-NET-000078-VPN-000290
Group -
The ICS must be configured to generate log records containing sufficient information about where, when, identity, source, or outcome of the events.
Without establishing when events occurred, it is impossible to establish, correlate, and investigate the events leading up to an outage or attack. VPN gateways often have a separate audit log for ...Rule Low Severity -
SRG-NET-000138-VPN-000490
Group -
The ICS must be configured to uniquely identify and authenticate organizational users (or processes acting on behalf of organizational users).
To ensure accountability and prevent unauthenticated access, organizational users must be identified and authenticated to prevent potential misuse and compromise of the system. Organizational user...Rule Medium Severity -
SRG-NET-000140-VPN-000500
Group -
The ICS must be configured to use multifactor authentication (e.g., DOD PKI) for network access to nonprivileged accounts.
To ensure accountability and prevent unauthenticated access, nonprivileged users must use multifactor authentication to prevent potential misuse and compromise of the system. Multifactor authentic...Rule High Severity -
SRG-NET-000164-VPN-000560
Group -
The ICS, when utilizing PKI-based authentication, must be configured to validate certificates by constructing a certification path (which includes status information) to an accepted trust anchor.
Without path validation, an informed trust decision by the relying party cannot be made when presented with any certificate not already explicitly trusted. To meet this requirement, the information...Rule Medium Severity -
SRG-NET-000213-VPN-000721
Group -
The ICS must terminate remote access network connections after an organization-defined time period.
This SRG requirement is in response to the DoD OIG Audit of Maintaining Cybersecurity in the Coronavirus Disease-2019 Telework Environment. Best practice is to terminate inactive user sessions aft...Rule Medium Severity -
SRG-NET-000334-VPN-001260
Group -
The ICS must be configured to send user traffic log data to redundant central log server.
The aggregation of log data kept on a syslog server can be used to detect attacks and trigger an alert to the appropriate security personnel. The stored log data can used to detect weaknesses in se...Rule Medium Severity -
SRG-NET-000335-VPN-001270
Group -
The ICS must be configured to forward all log failure events where the detection and/or prevention function is unable to write events to local log record or send an SNMP trap that can be forwarded to the SCA and ISSO.
It is critical for the appropriate personnel to be aware if a system is at risk of failing to process audit logs as required. Without a real-time alert, security personnel may be unaware of an impe...Rule Medium Severity -
SRG-NET-000343-VPN-001370
Group -
The ICS must be configured to authenticate all clients before establishing a connection.
Without authenticating devices, unidentified or unknown devices may be introduced, thereby facilitating malicious activity. For ICS, user authentication uses authentication servers, realms, roles,...Rule Medium Severity -
SRG-NET-000352-VPN-001460
Group -
The ICS must be configured to use an approved Commercial Solution for Classified (CSfC) when transporting classified traffic across an unclassified network.
Use of weak or untested encryption algorithms undermines the purposes of using encryption to protect data. The National Security Agency/Central Security Service's (NSA/CSS) CSfC Program enables co...Rule Medium Severity -
SRG-NET-000369-VPN-001620
Group -
The ICS must be configured to disable split-tunneling for remote client VPNs.
Split tunneling would in effect allow unauthorized external connections, making the system more vulnerable to attack and to exfiltration of organizational information. A VPN hardware or software c...Rule Medium Severity -
SRG-NET-000550-VPN-002360
Group -
The ICS that provides a Simple Network Management Protocol (SNMP) Network Management System (NMS) must configure SNMPv3 to use FIPS-validated AES cipher block algorithm.
Without device-to-device authentication, communications with malicious devices may be established. Bidirectional authentication provides stronger safeguards to validate the identity of other device...Rule Medium Severity -
SRG-NET-000019-VPN-000040
Group -
The ICS must be configured to ensure inbound and outbound traffic is configured with a security policy in compliance with information flow control policies.
Unrestricted traffic may contain malicious traffic which poses a threat to an enclave or to other connected networks. Additionally, unrestricted traffic may transit a network, which uses bandwidth ...Rule Medium Severity
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