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.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-207258	SRG-NET-000530-VPN-002340	SV-207258r608988_rule		Medium

Description

Using older unauthorized versions or incorrectly configuring protocol negotiation makes the gateway vulnerable to known and unknown attacks that exploit vulnerabilities in this protocol. This requirement applies to TLS gateways (also known as SSL gateways), web servers, and web applications. Application protocols such as HTTPS and DNSSEC use TLS as the underlying security protocol and thus are in scope for this requirement. NIST SP 800-52 provides guidance for client negotiation on either DoD-only or public-facing servers.

STIG	Date
Virtual Private Network (VPN) Security Requirements Guide	2021-09-27

Details

Check Text ( C-7518r378395_chk )
Verify the TLS VPN Gateway that supports Government-only services prohibits client negotiation to TLS 1.1, TLS 1.0, SSL 2.0, or SSL 3.0. If the TLS VPN Gateway that supports Government-only services does not prohibit client negotiation to TLS 1.1, TLS 1.0, SSL 2.0, or SSL 3.0, this is a finding.

Fix Text (F-7518r378396_fix)
Configure the TLS VPN Gateway that supports Government-only services to prohibit client negotiation to TLS 1.1, TLS 1.0, SSL 2.0, or SSL 3.0.