The VPN Gateway must be configured to use IPsec with SHA-1 or greater for hashing to protect the integrity of remote access sessions.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-97057	SRG-NET-000063-VPN-000220	SV-106195r1_rule		Medium

Description
Without strong cryptographic integrity protections, information can be altered by unauthorized users without detection. Although allowed by SP800-131Ar1 for some applications, SHA-1 is considered a compromised hashing standard and is being phased out of use by industry and government standards. Unless required for legacy use, DoD systems should not be configured to use SHA-1 for integrity of remote access sessions. For digital signature verification, SHA-1 is allowed for legacy-use. For all other hash function applications (e.g., HMAC, KDFs, RBG, password hashing, checksum integrity checks), the use of SHA-1 is acceptable, but discouraged in DoD. The remote access VPN provides access to DoD non-public information systems by an authorized user (or an information system) communicating through an external, non-organization-controlled network.

Description

Without strong cryptographic integrity protections, information can be altered by unauthorized users without detection. Although allowed by SP800-131Ar1 for some applications, SHA-1 is considered a compromised hashing standard and is being phased out of use by industry and government standards. Unless required for legacy use, DoD systems should not be configured to use SHA-1 for integrity of remote access sessions. For digital signature verification, SHA-1 is allowed for legacy-use. For all other hash function applications (e.g., HMAC, KDFs, RBG, password hashing, checksum integrity checks), the use of SHA-1 is acceptable, but discouraged in DoD. The remote access VPN provides access to DoD non-public information systems by an authorized user (or an information system) communicating through an external, non-organization-controlled network.

STIG	Date
Virtual Private Network (VPN) Security Requirements Guide	2019-07-26

Details

Check Text ( C-95893r1_chk )
Verify the VPN Gateway uses IPsec with SHA-1 or greater for hashing to protect the integrity of remote access sessions. If the VPN Gateway does not use IPsec with SHA-1 or greater for hashing to protect the integrity of remote access sessions, this is a finding.

Fix Text (F-102737r1_fix)
Configure the VPN Gateway to use IPsec with SHA-1 or greater for hashing to protect the integrity of remote access sessions.