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An IIS 8.5 web server must maintain the confidentiality of controlled information during transmission through the use of an approved TLS version.


Overview

Finding ID Version Rule ID IA Controls Severity
V-214436 IISW-SV-000153 SV-214436r903078_rule High
Description
Transport Layer Security (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 8.5 Server Security Technical Implementation Guide 2023-03-09

Details

Check Text ( C-15646r903076_chk )
Access the IIS 8.5 Web Server.

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

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

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-15644r903077_fix)
Access the IIS 8.5 Web Server.

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

Create a REG_DWORD named "DisabledByDefault" with a value of "0".
Create a REG_DWORD named "Enabled" with a value of "1".

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

For each protocol:
Create a REG_DWORD named "DisabledByDefault" with a value of "1".
Create a REG_DWORD named "Enabled" with a value of "0".