Title

The UEM server must be configured to prohibit client negotiation to TLS 1.1, TLS 1.0, SSL 2.0, or SSL 3.0. (Cat II impact)

Discussion

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 Transport Layer Security (TLS) gateways (also known as Secure Sockets Layer [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, either on DoD-only or on public-facing servers.

Check Content

Verify the UEM server is configured to prohibit client negotiation to TLS 1.1, TLS 1.0, SSL 2.0, or SSL 3.0. If the UEM server is not configured to prohibit client negotiation to TLS 1.1, TLS 1.0, SSL 2.0, or SSL 3.0, this is a finding.

Fix Text

Configure the UEM server to prohibit client negotiation to TLS 1.1, TLS 1.0, SSL 2.0, or SSL 3.0.

Additional Identifiers

Rule ID: SRG-APP-000560-UEM-000394_rule

Vulnerability ID: SRG-APP-000560-UEM-000394

Group Title: SRG-APP-000560-UEM-000394

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.