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Cisco ASA VPN Security Technical Implementation Guide

Rules, Groups, and Values defined within the XCCDF Benchmark

  • SRG-NET-000078-VPN-000290

    <GroupDescription></GroupDescription>
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  • The Cisco ASA must be configured to generate log records containing information to establish when 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-000336-VPN-001280

    <GroupDescription></GroupDescription>
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  • The Cisco ASA must be configured to queue log records locally in the event that the central audit server is down or not reachable.

    &lt;VulnDiscussion&gt;If the system were to continue processing after audit failure, actions can be taken on the system that cannot be tracked and ...
    Rule Medium Severity
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  • SRG-NET-000335-VPN-001270

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  • The Cisco ASA must be configured to generate an alert that can be forwarded as an alert to organization-defined personnel and/or firewall administrator of all log failure events.

    &lt;VulnDiscussion&gt;It is critical for the appropriate personnel to be aware if a system is at risk of failing to process audit logs as required....
    Rule Medium Severity
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  • SRG-NET-000164-VPN-000560

    <GroupDescription></GroupDescription>
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  • The Cisco ASA must be configured to validate certificates via a trustpoint that identifies a DoD or DoD-approved certificate authority.

    &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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  • SRG-NET-000512-VPN-002230

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  • The Cisco ASA must be configured to not accept certificates that have been revoked when using PKI for authentication.

    &lt;VulnDiscussion&gt;Situations may arise in which the certificate issued by a Certificate Authority (CA) may need to be revoked before the lifeti...
    Rule High Severity
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  • SRG-NET-000512-VPN-002220

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  • The Cisco ASA must be configured to use Internet Key Exchange (IKE) for all IPsec security associations.

    &lt;VulnDiscussion&gt;Without IKE, the Security Parameter Index (SPI) is manually specified for each security association. IKE peers will negotiate...
    Rule High Severity
    Show

  • SRG-NET-000132-VPN-000460

    <GroupDescription></GroupDescription>
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  • The Cisco ASA must be configured to use Internet Key Exchange v2 (IKEv2) for all IPsec 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-000510-VPN-002180

    <GroupDescription></GroupDescription>
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  • The Cisco ASA must be configured to use NIST FIPS-validated cryptography for Internet Key Exchange (IKE) Phase 1.

    &lt;VulnDiscussion&gt;Use of weak or untested encryption algorithms undermines the purposes of utilizing encryption to protect data. The VPN gatewa...
    Rule Medium Severity
    Show

  • SRG-NET-000371-VPN-001640

    <GroupDescription></GroupDescription>
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  • The Cisco ASA must be configured to specify Perfect Forward Secrecy (PFS) for the IPsec Security Association (SA) during IKE Phase 2 negotiation.

    &lt;VulnDiscussion&gt;PFS generates each new encryption key independently from the previous key. Without PFS, compromise of one key will compromise...
    Rule Medium Severity
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  • SRG-NET-000510-VPN-002160

    <GroupDescription></GroupDescription>
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  • The Cisco ASA must be configured to use a FIPS-validated cryptographic module to generate cryptographic hashes.

    &lt;VulnDiscussion&gt;FIPS 140-2/140-3 precludes the use of invalidated cryptography for the cryptographic protection of sensitive or valuable data...
    Rule Medium Severity
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  • SRG-NET-000510-VPN-002170

    <GroupDescription></GroupDescription>
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  • The Cisco ASA must be configured to use a FIPS-validated cryptographic module to implement IPsec encryption services.

    &lt;VulnDiscussion&gt;FIPS 140-2/140-3 precludes the use of invalidated cryptography for the cryptographic protection of sensitive or valuable data...
    Rule Medium Severity
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  • SRG-NET-000074-VPN-000250

    <GroupDescription></GroupDescription>
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  • The Cisco ASA 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
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  • SRG-NET-000168-VPN-000600

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  • The Cisco ASA must be configured to use FIPS-validated SHA-2 at 384 bits or higher for Internet Key Exchange (IKE) Phase 1.

    &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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  • SRG-NET-000230-VPN-000780

    <GroupDescription></GroupDescription>
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  • The Cisco ASA must be configured to use FIPS-validated SHA-2 or higher for Internet Key Exchange (IKE) Phase 2.

    &lt;VulnDiscussion&gt;Authenticity protection provides protection against man-in-the-middle attacks/session hijacking and the insertion of false in...
    Rule High Severity
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  • SRG-NET-000019-VPN-000040

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  • The Cisco ASA VPN gateway must be configured to restrict what traffic is transported via the IPsec tunnel according to flow control policies.

    &lt;VulnDiscussion&gt;Unrestricted traffic may contain malicious traffic which poses a threat to an enclave or to other connected networks. Additio...
    Rule Medium Severity
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  • SRG-NET-000148-VPN-000540

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  • The Cisco ASA VPN gateway must be configured to identify all peers 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-000565-VPN-002400

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  • The Cisco ASA VPN gateway must use cryptographic algorithms approved by NSA to protect NSS when transporting classified traffic across an unclassified network.

    &lt;VulnDiscussion&gt;Use of weak or untested encryption algorithms undermines the purposes of utilizing encryption to protect data. The VPN gatewa...
    Rule High Severity
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  • SRG-NET-000337-VPN-001290

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  • The Cisco ASA VPN gateway must be configured to renegotiate the IPsec Security Association after eight hours or less.

    &lt;VulnDiscussion&gt;The IPsec SA and its corresponding key will expire either after the number of seconds or amount of traffic volume has exceede...
    Rule Medium Severity
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  • SRG-NET-000337-VPN-001300

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  • The Cisco ASA VPN gateway must be configured to renegotiate the IKE security association after 24 hours or less.

    &lt;VulnDiscussion&gt;When a VPN gateway creates an IPsec Security Association (SA), resources must be allocated to maintain the SA. These resource...
    Rule Medium Severity
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  • SRG-NET-000166-VPN-000580

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  • The Cisco ASA remote access VPN server must be configured to use a separate authentication server than that used for administrative access.

    &lt;VulnDiscussion&gt;The VPN interacts directly with public networks and devices and should not contain user authentication information for all us...
    Rule Medium Severity
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  • SRG-NET-000320-VPN-001120

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  • The Cisco ASA remote access VPN server must be configured to use LDAP over SSL to determine authorization for granting access to the network.

    &lt;VulnDiscussion&gt;Protecting authentication communications between the client, the VPN Gateway, and the authentication server keeps this critic...
    Rule Medium Severity
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  • SRG-NET-000138-VPN-000490

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  • The Cisco ASA remote access VPN server must be configured to identify and authenticate users before granting access to the network.

    &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-VPN-000500

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  • The Cisco ASA remote access VPN server must be configured to enforce certificate-based authentication before granting access to the network.

    &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-000166-VPN-000590

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  • SRG-NET-000041-VPN-000110

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  • The Cisco ASA remote access VPN server must be configured to display the Standard Mandatory DoD Notice and Consent Banner before granting 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-000079-VPN-000300

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Node 2

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