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An IIS 10.0 web server must maintain the confidentiality of controlled information during transmission through the use of an approved Transport Layer Security (TLS) version.


Overview

Finding ID Version Rule ID IA Controls Severity
V-218821 IIST-SV-000153 SV-218821r561041_rule High
Description
TLS encryption is a required security setting for a private web server. Encryption of private information is essential to ensuring data confidentiality. If private information is not encrypted, it can be intercepted and easily read by an unauthorized party. A private web server must use a FIPS 140-2-approved TLS version, and all non-FIPS-approved SSL versions must be disabled. NIST SP 800-52 specifies the preferred configurations for government systems.
STIG Date
Microsoft IIS 10.0 Server Security Technical Implementation Guide 2022-06-17

Details

Check Text ( C-20293r505282_chk )
Access the IIS 10.0 Web Server.

Access an administrator command prompt and type "regedit " to access the server's registry.

Navigate to:
HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Server

Verify a REG_DWORD value of "0" for "DisabledByDefault"

Navigate to:
HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.0\Server

HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.1\Server

HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 2.0\Server

HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 3.0\Server

Verify a REG_DWORD value of "1" for "DisabledByDefault"
Verify a REG_DWORD value of "0" for "Enabled"

If any of the respective registry paths do not exist or are configured with the wrong value, this is a finding.
Fix Text (F-20291r505283_fix)
Access the IIS 10.0 Web Server.

Access an administrator command prompt and type "regedit " to access the server's registry.

Navigate to the following registry paths and configure the "DisabledByDefault" REG_DWORD with the appropriate values:

HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Server

With a REG_DWORD value of "0" for "DisabledByDefault"

HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.0\Server

HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.1\Server

HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 2.0\Server

HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 3.0\Server

With a REG_DWORD value of "1" for "DisabledByDefault"

With a REG_DWORD value of "0" for "Enabled"