III - Administrative Sensitive
Rules and Groups employed by this XCCDF Profile
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SRG-NET-000342
<GroupDescription></GroupDescription>Group -
The VPN Gateway must electronically verify the Common Access Card (CAC) credential.
<VulnDiscussion>DoD has mandated the use of the CAC as the Personal Identity Verification (PIV) credential to support identity management and...Rule Medium Severity -
SRG-NET-000343
<GroupDescription></GroupDescription>Group -
The VPN Gateway must authenticate all network-connected endpoint devices before establishing a connection.
<VulnDiscussion>Without authenticating devices, unidentified or unknown devices may be introduced, thereby facilitating malicious activity. ...Rule Medium Severity -
SRG-NET-000352
<GroupDescription></GroupDescription>Group -
The VPN Gateway must use an approved Commercial Solution for Classified (CSfC) when transporting classified traffic across an unclassified network.
<VulnDiscussion>Use of weak or untested encryption algorithms undermines the purposes of using encryption to protect data. The National Secu...Rule Medium Severity -
SRG-NET-000369
<GroupDescription></GroupDescription>Group -
The VPN Gateway must disable split-tunneling for remote clients VPNs.
<VulnDiscussion>Split tunneling would in effect allow unauthorized external connections, making the system more vulnerable to attack and to e...Rule Medium Severity -
SRG-NET-000371
<GroupDescription></GroupDescription>Group -
The IPsec VPN Gateway must specify Perfect Forward Secrecy (PFS) during Internet Key Exchange (IKE) negotiation.
<VulnDiscussion>PFS generates each new encryption key independently from the previous key. Without PFS, compromise of one key will compromise...Rule High Severity -
SRG-NET-000371
<GroupDescription></GroupDescription>Group -
The VPN Gateway and Client must be configured to protect the confidentiality and integrity of transmitted information.
<VulnDiscussion>Without protection of the transmitted information, confidentiality and integrity may be compromised as unprotected communicat...Rule High Severity -
SRG-NET-000400
<GroupDescription></GroupDescription>Group -
For accounts using password authentication, the site-to-site VPN Gateway must use SHA-2 or later protocol to protect the integrity of the password authentication process.
<VulnDiscussion>Passwords need to be protected at all times, and encryption is the standard method for protecting passwords. If passwords are...Rule Medium Severity -
SRG-NET-000492
<GroupDescription></GroupDescription>Group -
The VPN Gateway must generate log records when successful and/or unsuccessful VPN connection attempts occur.
<VulnDiscussion>Without generating log records that are specific to the security and mission needs of the organization, it would be difficult...Rule Medium Severity -
SRG-NET-000510
<GroupDescription></GroupDescription>Group -
The VPN Gateway must use a FIPS-validated cryptographic module to generate cryptographic hashes.
<VulnDiscussion>FIPS 140-2 precludes the use of invalidated cryptography for the cryptographic protection of sensitive or valuable data withi...Rule Medium Severity -
SRG-NET-000510
<GroupDescription></GroupDescription>Group -
The VPN Gateway must use a FIPS-validated cryptographic module to implement encryption services for unclassified information requiring confidentiality.
<VulnDiscussion>FIPS 140-2 precludes the use of invalidated cryptography for the cryptographic protection of sensitive or valuable data withi...Rule Medium Severity -
SRG-NET-000510
<GroupDescription></GroupDescription>Group -
The IPsec VPN Gateway IKE must use NIST FIPS-validated cryptography to implement encryption services for unclassified VPN traffic.
<VulnDiscussion>Use of weak or untested encryption algorithms undermines the purposes of utilizing encryption to protect data. The VPN gatewa...Rule Medium Severity -
SRG-NET-000512
<GroupDescription></GroupDescription>Group -
The IPsec VPN Gateway must use Internet Key Exchange (IKE) for IPsec VPN Security Associations (SAs).
<VulnDiscussion>Without IKE, the SPI is manually specified for each security association. IKE peers will negotiate the encryption algorithm a...Rule High Severity -
SRG-NET-000518
<GroupDescription></GroupDescription>Group -
The VPN Client logout function must be configured to terminate the session on/with the VPN Gateway.
<VulnDiscussion>If a user cannot explicitly end a session, the session may remain open and be exploited by an attacker; this is referred to a...Rule Medium Severity -
SRG-NET-000519
<GroupDescription></GroupDescription>Group -
The VPN Client must display an explicit logout message to users indicating the reliable termination of authenticated communications sessions.
<VulnDiscussion>If a user cannot explicitly end a session, the session may remain open and be exploited by an attacker; this is referred to a...Rule Medium Severity -
SRG-NET-000522
<GroupDescription></GroupDescription>Group -
For site-to-site, VPN Gateway must be configured to store only cryptographic representations of pre-shared Keys (PSKs).
<VulnDiscussion>PSKs need to be protected at all times, and encryption is the standard method for protecting passwords. If PSKs are not encry...Rule Medium Severity -
SRG-NET-000525
<GroupDescription></GroupDescription>Group -
The IPsec VPN must use AES256 or greater encryption for the IPsec proposal to protect the confidentiality of remote access sessions.
<VulnDiscussion>Without confidentiality protection mechanisms, unauthorized individuals may gain access to sensitive information via a remote...Rule High Severity -
SRG-NET-000530
<GroupDescription></GroupDescription>Group -
The TLS VPN Gateway that supports Government-only services must prohibit client negotiation to TLS 1.1, TLS 1.0, SSL 2.0, or SSL 3.0.
<VulnDiscussion>Using older unauthorized versions or incorrectly configuring protocol negotiation makes the gateway vulnerable to known and u...Rule Medium Severity -
SRG-NET-000540
<GroupDescription></GroupDescription>Group -
The TLS VPN Gateway that supports citizen- or business-facing network devices must prohibit client negotiation to SSL 2.0 or SSL 3.0.
<VulnDiscussion>Using older unauthorized versions or incorrectly configuring protocol negotiation makes the gateway vulnerable to known and u...Rule Medium Severity -
SRG-NET-000550
<GroupDescription></GroupDescription>Group -
The VPN Gateway that provides a Simple Network Management Protocol (SNMP) Network Management System (NMS) must configure SNMPv3 to use FIPS-validated AES cipher block algorithm.
<VulnDiscussion>Without device-to-device authentication, communications with malicious devices may be established. Bidirectional authenticati...Rule Medium Severity -
SRG-NET-000565
<GroupDescription></GroupDescription>Group -
The VPN remote access server must be configured use cryptographic algorithms approved by NSA to protect NSS for remote access to a classified network.
<VulnDiscussion>Use of weak or untested encryption algorithms undermines the purposes of utilizing encryption to protect data. The VPN gatewa...Rule High Severity -
SRG-NET-000565
<GroupDescription></GroupDescription>Group -
The VPN gateway must use cryptographic algorithms approved by NSA to protect NSS when transporting classified traffic across an unclassified network.
<VulnDiscussion>Use of weak or untested encryption algorithms undermines the purposes of utilizing encryption to protect data. The VPN gatewa...Rule High Severity -
SRG-NET-000580
<GroupDescription></GroupDescription>Group -
The VPN Gateway must validate certificates used for Transport Layer Security (TLS) functions by performing RFC 5280-compliant certification path validation.
<VulnDiscussion>A certificate's certification path is the path from the end entity certificate to a trusted root certification authority (CA)...Rule Medium Severity -
SRG-NET-000213
<GroupDescription></GroupDescription>Group -
The Remote Access VPN Gateway must terminate remote access network connections after an organization-defined time period.
<VulnDiscussion>This SRG requirement is in response to the DoD OIG Audit of Maintaining Cybersecurity in the Coronavirus Disease-2019 Telewor...Rule Medium Severity -
SRG-NET-000705
<GroupDescription></GroupDescription>Group -
The VPN Gateway must employ organization-defined controls by type of denial of service (DoS) to achieve the DoS objective.
<VulnDiscussion>DoS events may occur due to a variety of internal and external causes, such as an attack by an adversary or a lack of plannin...Rule Medium Severity -
SRG-NET-000715
<GroupDescription></GroupDescription>Group -
The VPN Gateway must implement physically or logically separate subnetworks to isolate organization-defined critical system components and functions.
<VulnDiscussion>Separating critical system components and functions from other noncritical system components and functions through separate s...Rule Medium Severity
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