STIGQter: STIG Summary: Microsoft Internet Explorer 11 Security Technical Implementation Guide Version: 1 Release: 19 Benchmark Date: 24 Jul 2020:

Allow Fallback to SSL 3.0 (Internet Explorer) must be disabled.

DISA Rule

SV-79219r3_rule

Vulnerability Number

V-64729

Group Title

DTBI1100-IE11-Allow Fallback to SSL 3.0 (Internet Explorer)

Rule Version

DTBI1100-IE11

Severity

CAT II

CCI(s)

• 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.

Weight

10

Fix Recommendation

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.

Check Contents

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.

Vulnerability Number

V-64729

Documentable

False

Rule Version

DTBI1100-IE11

Severity Override Guidance

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.

Check Content Reference

M

Target Key

2589

Comments