Allow Fallback to SSL 3.0 (Internet Explorer) must be disabled.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-250541 | DTBI1100-IE11 | SV-250541r942485_rule | CCI-002450 | medium |
| Description | ||||
| This parameter ensures only DoD-approved ciphers and algorithms are enabled for use by the web browser by blocking an insecure fallback to SSL when TLS 1.0 or greater fails. Satisfies: SRG-APP-000514, SRG-APP-000555, SRG-APP-000625, SRG-APP-000630, SRG-APP-000635 | ||||
| STIG | Date | |||
| Microsoft Internet Explorer 11 Security Technical Implementation Guide | 2023-12-01 | |||
Details
Check Text (C-250541r942485_chk)
The policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Internet Explorer >> Security Features >> "Allow fallback to SSL 3.0 (Internet Explorer)" must be "Enabled", and "No Sites" selected from the drop-down box. If "Allow fallback to SSL 3.0 (Internet Explorer)" is not "Enabled" or any other drop-down option is selected, this is a finding.
Procedure: Use the Windows Registry Editor to navigate to the following key:
HKLM\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings.
Criteria: If the value "EnableSSL3Fallback" is REG_DWORD=0, this is not a finding.
Fix Text (F-53930r799948_fix)
Set the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Internet Explorer >> Security Features >> "Allow fallback to SSL 3.0 (Internet Explorer)" to "Enabled", and select "No Sites" from the drop-down box.