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Virtual Private Network (VPN) Security Requirements Guide

Rules, Groups, and Values defined within the XCCDF Benchmark

  • 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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  • SRG-NET-000132

    <GroupDescription></GroupDescription>
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  • For site-to-site VPN implementations, the L2TP protocol must be blocked or denied at the security boundary with the private network so unencrypted L2TP packets cannot traverse into the private network of the enclave.

    &lt;VulnDiscussion&gt;Unlike GRE (a simple encapsulating header) L2TP is a full-fledged communications protocol with control channel, data channels...
    Rule Medium Severity
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  • SRG-NET-000138

    <GroupDescription></GroupDescription>
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  • The VPN Gateway must uniquely identify and authenticate organizational users (or processes acting on behalf of organizational users).

    &lt;VulnDiscussion&gt;To assure accountability and prevent unauthenticated access, organizational users must be identified and authenticated to pre...
    Rule Medium Severity
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  • SRG-NET-000140

    <GroupDescription></GroupDescription>
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  • The VPN Gateway must use FIPS-validated SHA-2 or higher hash function to protect the integrity of hash message authentication code (HMAC), Key Derivation Functions (KDFs), Random Bit Generation, hash-only applications, and digital signature verification.

    &lt;VulnDiscussion&gt;Without cryptographic integrity protections, information can be altered by unauthorized users without detection. Although al...
    Rule Medium Severity
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  • The VPN Gateway must use multifactor authentication (e.g., DoD PKI) for network access to non-privileged accounts.

    &lt;VulnDiscussion&gt;To assure accountability and prevent unauthenticated access, non-privileged users must utilize multifactor authentication to ...
    Rule High Severity
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  • SRG-NET-000145

    <GroupDescription></GroupDescription>
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  • The VPN Client must implement multifactor authentication for network access to nonprivileged accounts such that one of the factors is provided by a device separate from the system gaining access.

    &lt;VulnDiscussion&gt;Using an authentication device, such as a common access card (CAC) or token that is separate from the information system, ens...
    Rule Medium Severity
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  • SRG-NET-000147

    <GroupDescription></GroupDescription>
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  • The TLS VPN must be configured to use replay-resistant authentication mechanisms for network access to nonprivileged accounts.

    &lt;VulnDiscussion&gt;A replay attack may enable an unauthorized user to gain access to the application. Authentication sessions between the authen...
    Rule Medium Severity
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  • SRG-NET-000147

    <GroupDescription></GroupDescription>
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  • The IPsec VPN Gateway must use anti-replay mechanisms for security associations.

    &lt;VulnDiscussion&gt;Anti-replay is an IPsec security mechanism at a packet level, which helps to avoid unwanted users from intercepting and modif...
    Rule Medium Severity
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  • SRG-NET-000148

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  • SRG-NET-000169

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  • The VPN Gateway must uniquely identify all network-connected endpoint devices before establishing a connection.

    &lt;VulnDiscussion&gt;Without identifying devices, unidentified or unknown devices may be introduced, thereby facilitating malicious activity. For...
    Rule Medium Severity
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  • SRG-NET-000164

    <GroupDescription></GroupDescription>
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  • The VPN Gateway, when utilizing PKI-based authentication, must validate certificates by constructing a certification path (which includes status information) to an accepted trust anchor.

    &lt;VulnDiscussion&gt;Without path validation, an informed trust decision by the relying party cannot be made when presented with any certificate n...
    Rule Medium Severity
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