Check: DTBI1100-IE11
Microsoft Internet Explorer 11 STIG:
DTBI1100-IE11
(in versions v2 r5 through v1 r12)
Title
Allow Fallback to SSL 3.0 (Internet Explorer) must be disabled. (Cat II impact)
Discussion
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
Check Content
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
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.
Additional Identifiers
Rule ID: SV-250541r942485_rule
Vulnerability ID: V-250541
Group Title: SRG-APP-000416
Expert Comments
CCIs
| Number | Definition |
|---|---|
| CCI-002450 |
The information system implements organization-defined cryptographic uses and type of cryptography required for each use in accordance with applicable federal laws, Executive Orders, directives, policies, regulations, and standards. |
| CCI-002480 |
The organization defines the information system components for which a diverse set of information technologies are to be employed. |