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Virtual Private Network (VPN) Security Requirements Guide

Rules, Groups, and Values defined within the XCCDF Benchmark

  • The VPN Gateway must terminate all network connections associated with a communications session at the end of the session.

    Idle TCP sessions can be susceptible to unauthorized access and hijacking attacks. By default, routers do not continually test whether a previously connected TCP endpoint is still reachable. If one...
    Rule Low Severity
    Show

  • SRG-NET-000230

    Group
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  • The VPN Gateway must use FIPS 140-2 compliant mechanisms for authentication to a cryptographic module.

    Unapproved mechanisms that are used for authentication to the cryptographic module are not verified, and therefore cannot be relied upon to provide confidentiality or integrity and DoD data may be ...
    Rule Medium Severity
    Show

  • SRG-NET-000230

    Group
    Show

  • The IPSec VPN must be configured to use FIPS-validated SHA-2 at 384 bits or higher for Internet Key Exchange (IKE).

    Without cryptographic integrity protections, information can be altered by unauthorized users without detection. Although allowed by SP800-131Ar2 for some applications, SHA-1 is considered a compr...
    Rule High Severity
    Show

  • SRG-NET-000231

    Group
    Show

  • SRG-NET-000233

    Group
    Show

  • SRG-NET-000234

    Group
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  • The VPN Gateway must generate unique session identifiers using FIPS-validated Random Number Generator (RNG) based on the Deterministic Random Bit Generators (DRBG) algorithm.

    Both IPsec and TLS gateways use the RNG to strengthen the security of the protocols. Using a weak RNG will weaken the protocol and make it more vulnerable.
    Rule Medium Severity
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  • SRG-NET-000235

    Group
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  • The VPN Gateway must fail to a secure state if system initialization fails, shutdown fails, or aborts fail.

    Failure to a known safe state helps prevent systems from failing to a state that may cause loss of data or unauthorized access to system resources. VPN gateways that fail suddenly and with no incor...
    Rule Medium Severity
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  • SRG-NET-000313

    Group
    Show

  • SRG-NET-000314

    Group
    Show

  • SRG-NET-000317

    Group
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  • The IPsec VPN Gateway must use AES encryption for the Internet Key Exchange (IKE) proposal to protect confidentiality of remote access sessions.

    Without confidentiality protection mechanisms, unauthorized individuals may gain access to sensitive information via a remote access session. Remote access is access to DoD non-public information ...
    Rule High Severity
    Show

  • SRG-NET-000334

    Group
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  • The VPN Gateway must off-load audit records onto a different system or media than the system being audited.

    Information stored in one location is vulnerable to accidental or incidental deletion or alteration. Off-loading is a common process in information systems with limited audit storage capacity. Th...
    Rule Medium Severity
    Show

  • SRG-NET-000335

    Group
    Show

  • SRG-NET-000337

    Group
    Show

  • The VPN Gateway must renegotiate the IPsec security association (SA) after eight hours or less.

    The IPsec SA and its corresponding key will expire either after the number of seconds or amount of traffic volume has exceeded the configured limit. A new SA is negotiated before the lifetime thres...
    Rule Medium Severity
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