Virtual Private Network (VPN) Security Requirements Guide
Rules, Groups, and Values defined within the XCCDF Benchmark
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The IPsec VPN Gateway must use Internet Key Exchange (IKE) for IPsec VPN Security Associations (SAs).
Without IKE, the SPI is manually specified for each security association. IKE peers will negotiate the encryption algorithm and authentication or hashing methods as well as generate the encryption ...Rule High Severity -
For site-to-site, VPN Gateway must be configured to store only cryptographic representations of pre-shared Keys (PSKs).
PSKs need to be protected at all times, and encryption is the standard method for protecting passwords. If PSKs are not encrypted, they can be plainly read and easily compromised. Use of passwords ...Rule Medium Severity -
The IPsec VPN must use AES256 or greater encryption for the IPsec proposal to protect the 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 nonpublic information s...Rule High Severity -
The VPN remote access server must be configured use cryptographic algorithms approved by NSA to protect NSS for remote access to a classified network.
Use of weak or untested encryption algorithms undermines the purposes of utilizing encryption to protect data. The VPN gateway must implement cryptographic modules adhering to the higher standards ...Rule High Severity -
The VPN Gateway must validate certificates used for Transport Layer Security (TLS) functions by performing RFC 5280-compliant certification path validation.
A certificate's certification path is the path from the end entity certificate to a trusted root certification authority (CA). Certification path validation is necessary for a relying party to make...Rule Medium Severity
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