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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-76759 | IISW-SV-000153 | SV-91455r2_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. FIPS 140-2-approved TLS versions include TLS V1.1 or greater. NIST SP 800-52 specifies the preferred configurations for government systems. |
| STIG | Date |
|---|---|
| IIS 8.5 Server Security Technical Implementation Guide | 2019-03-20 |
Details
| Check Text ( C-76415r2_chk ) |
|---|
| Access the IIS 8.5 Web Server. Access an administrator command prompt and type "regedit Navigate to: HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.1\Server 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\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-83455r2_fix) |
|---|
| Access the IIS 8.5 Web Server. Access an administrator command prompt and type "regedit Navigate to the following registry paths and configure the "DisabledByDefault" REG_DWORD with the appropriate values: HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.1\Server 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\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" |