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Virtual Private Network (VPN) Security Requirements Guide

Rules, Groups, and Values defined within the XCCDF Benchmark

  • SRG-NET-000166

    <GroupDescription></GroupDescription>
    Group
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  • SRG-NET-000317

    <GroupDescription></GroupDescription>
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  • The VPN Gateway must electronically verify the Common Access Card (CAC) credential.

    &lt;VulnDiscussion&gt;DoD has mandated the use of the CAC as the Personal Identity Verification (PIV) credential to support identity management and...
    Rule Medium Severity
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  • SRG-NET-000343

    <GroupDescription></GroupDescription>
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  • The TLS VPN Gateway must use TLS 1.2, at a minimum, to protect the confidentiality of sensitive data during transmission for remote access connections.

    &lt;VulnDiscussion&gt;Using older unauthorized versions or incorrectly configuring protocol negotiation makes the gateway vulnerable to known and u...
    Rule High Severity
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  • SRG-NET-000063

    <GroupDescription></GroupDescription>
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  • SRG-NET-000041

    <GroupDescription></GroupDescription>
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  • The Remote Access VPN Gateway and/or client must display the Standard Mandatory DoD Notice and Consent Banner before granting remote access to the network.

    &lt;VulnDiscussion&gt;Display of a standardized and approved use notification before granting access to the network ensures privacy and security no...
    Rule Medium Severity
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  • SRG-NET-000042

    <GroupDescription></GroupDescription>
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  • The Remote Access VPN Gateway and/or client must enforce a policy to retain the Standard Mandatory DoD Notice and Consent Banner on the screen until users acknowledge the usage conditions and take explicit actions to log on for further access.

    &lt;VulnDiscussion&gt;The banner must be acknowledged by the user prior to allowing the user access to the network. This provides assurance that th...
    Rule Medium Severity
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  • SRG-NET-000043

    <GroupDescription></GroupDescription>
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  • The publicly accessible VPN Gateway must display the Standard Mandatory DoD Notice and Consent Banner before granting access to the system.

    &lt;VulnDiscussion&gt;Display of a standardized and approved use notification before granting access to the publicly accessible VPN gateway ensures...
    Rule Medium Severity
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  • SRG-NET-000049

    <GroupDescription></GroupDescription>
    Group
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  • The VPN Gateway must notify the user, upon successful logon (access), of the number of unsuccessful logon (access) attempts since the last successful logon (access).

    &lt;VulnDiscussion&gt;Users need to be aware of activity that occurs regarding their account. Providing users with information regarding the number...
    Rule Low Severity
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  • SRG-NET-000053

    <GroupDescription></GroupDescription>
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  • The VPN Gateway must limit the number of concurrent sessions for user accounts to 1 or to an organization-defined number.

    &lt;VulnDiscussion&gt;VPN gateway management includes the ability to control the number of users and user sessions that utilize a VPN gateway. Limi...
    Rule Medium Severity
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  • SRG-NET-000062

    <GroupDescription></GroupDescription>
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  • The remote access VPN Gateway must use a digital signature generated using FIPS-validated algorithms and an approved hash function to protect the integrity of TLS remote access sessions.

    &lt;VulnDiscussion&gt;Without integrity protection, unauthorized changes may be made to the log files and reliable forensic analysis and discovery ...
    Rule Medium Severity
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  • SRG-NET-000063

    <GroupDescription></GroupDescription>
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  • The VPN Gateway must be configured to use IPsec with SHA-2 at 384 bits or greater for hashing to protect the integrity of remote access sessions.

    &lt;VulnDiscussion&gt;Without strong cryptographic integrity protections, information can be altered by unauthorized users without detection. SHA-...
    Rule Medium Severity
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  • SRG-NET-000074

    <GroupDescription></GroupDescription>
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  • The IPSec VPN must be configured to use a Diffie-Hellman (DH) Group of 16 or greater for Internet Key Exchange (IKE) Phase 1.

    &lt;VulnDiscussion&gt;Use of an approved DH algorithm ensures the IKE (Phase 1) proposal uses FIPS-validated key management techniques and processe...
    Rule High Severity
    Show

  • SRG-NET-000075

    <GroupDescription></GroupDescription>
    Group
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  • If the site-to-site VPN implementation uses L2TP, L2TPv3 sessions must be authenticated prior to transporting traffic.

    &lt;VulnDiscussion&gt;L2TPv3 sessions can be used to transport layer-2 protocols across an IP backbone. These protocols were intended for link-loca...
    Rule Medium Severity
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  • SRG-NET-000077

    <GroupDescription></GroupDescription>
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  • The VPN Gateway must generate log records containing information to establish what type of events occurred.

    &lt;VulnDiscussion&gt;Without establishing what type of event occurred, it would be difficult to establish, correlate, and investigate the events l...
    Rule Low Severity
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  • SRG-NET-000078

    <GroupDescription></GroupDescription>
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  • The VPN Gateway must generate log records containing information to establish when (date and time) the events occurred.

    &lt;VulnDiscussion&gt;Without establishing when events occurred, it is impossible to establish, correlate, and investigate the events leading up to...
    Rule Low Severity
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  • SRG-NET-000079

    <GroupDescription></GroupDescription>
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  • The VPN Gateway must generate log records containing information that establishes the identity of any individual or process associated with the event.

    &lt;VulnDiscussion&gt;Without information that establishes the identity of the subjects (i.e., users or processes acting on behalf of users) associ...
    Rule Medium Severity
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  • SRG-NET-000088

    <GroupDescription></GroupDescription>
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  • The VPN Gateway must generate log records containing information to establish where the events occurred.

    &lt;VulnDiscussion&gt;Without establishing where events occurred, it is impossible to establish, correlate, and investigate the events leading up t...
    Rule Medium Severity
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  • SRG-NET-000089

    <GroupDescription></GroupDescription>
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  • The VPN Gateway must generate log records containing information to establish the source of the events.

    &lt;VulnDiscussion&gt;Without establishing the source of the event, it is impossible to establish, correlate, and investigate the events leading up...
    Rule Low Severity
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  • SRG-NET-000091

    <GroupDescription></GroupDescription>
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  • The VPN Gateway must produce log records containing information to establish the outcome of the events.

    &lt;VulnDiscussion&gt;Without information about the outcome of events, security personnel cannot make an accurate assessment as to whether an attac...
    Rule Medium Severity
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  • SRG-NET-000098

    <GroupDescription></GroupDescription>
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  • The VPN Gateway must accept the Common Access Card (CAC) credential.

    &lt;VulnDiscussion&gt;The use of Personal Identity Verification (PIV) credentials facilitates standardization and reduces the risk of unauthorized...
    Rule Medium Severity
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  • SRG-NET-000342

    <GroupDescription></GroupDescription>
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  • The VPN Gateway must protect log information from unauthorized read access if all or some of this data is stored locally.

    &lt;VulnDiscussion&gt;Auditing and logging are key components of any security architecture. Logging the actions of specific events provides a means...
    Rule Low Severity
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  • SRG-NET-000099

    <GroupDescription></GroupDescription>
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  • The VPN Gateway log must protect audit information from unauthorized modification when stored locally.

    &lt;VulnDiscussion&gt;If audit data were to become compromised, then forensic analysis and discovery of the true source of potentially malicious sy...
    Rule Medium Severity
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  • SRG-NET-000100

    <GroupDescription></GroupDescription>
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  • The VPN Gateway must protect audit information from unauthorized deletion when stored locally.

    &lt;VulnDiscussion&gt;If audit data were to become compromised, then forensic analysis and discovery of the true source of potentially malicious sy...
    Rule Medium Severity
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  • SRG-NET-000132

    <GroupDescription></GroupDescription>
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  • The VPN Gateway must be configured to prohibit the use of all unnecessary and/or nonsecure functions, ports, protocols, and/or services, as defined in the PPSM CAL and vulnerability assessments.

    &lt;VulnDiscussion&gt;In order to prevent unauthorized connection of devices, unauthorized transfer of information, or unauthorized tunneling (i.e....
    Rule Medium Severity
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  • SRG-NET-000132

    <GroupDescription></GroupDescription>
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  • The IPsec VPN Gateway must use IKEv2 for IPsec VPN security associations.

    &lt;VulnDiscussion&gt;In order to prevent unauthorized connection of devices, unauthorized transfer of information, or unauthorized tunneling (i.e....
    Rule Medium Severity
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  • SRG-NET-000132

    <GroupDescription></GroupDescription>
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  • The Remote Access VPN Gateway must be configured to prohibit Point-to-Point Tunneling Protocol (PPTP) and L2F.

    &lt;VulnDiscussion&gt;The PPTP and L2F are obsolete method for implementing virtual private networks. Both protocols may be easy to use and readily...
    Rule Medium Severity
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