Internet Explorer Processes for MIME sniffing is not enabled. (Reserved)

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-15549	DTBI595	SV-16396r2_rule	ECSC-1	Medium

Description
MIME sniffing is the process of examining the content of a MIME file to determine its context — whether it is a data file, an executable file, or some other type of file. This policy setting determines whether Internet Explorer MIME sniffing will prevent promotion of a file of one type to a more dangerous file type. When set to Enabled, MIME sniffing will never promote a file of one type to a more dangerous file type. Disabling MIME sniffing configures Internet Explorer processes to allow a MIME sniff that promotes a file of one type to a more dangerous file type. For example, promoting a text file to an executable file is a dangerous promotion because any code in the supposed text file would be executed. MIME file-type spoofing is a potential threat to your organization. Ensuring that these files are consistently handled helps prevent malicious file downloads from infecting your network. Therefore, this appendix recommends you configure this policy as Enabled for all environments specified in this guide. Note: This setting works in conjunction with, but does not replace, the Consistent MIME Handling settings.

Description

MIME sniffing is the process of examining the content of a MIME file to determine its context — whether it is a data file, an executable file, or some other type of file. This policy setting determines whether Internet Explorer MIME sniffing will prevent promotion of a file of one type to a more dangerous file type. When set to Enabled, MIME sniffing will never promote a file of one type to a more dangerous file type. Disabling MIME sniffing configures Internet Explorer processes to allow a MIME sniff that promotes a file of one type to a more dangerous file type. For example, promoting a text file to an executable file is a dangerous promotion because any code in the supposed text file would be executed. MIME file-type spoofing is a potential threat to your organization. Ensuring that these files are consistently handled helps prevent malicious file downloads from infecting your network. Therefore, this appendix recommends you configure this policy as Enabled for all environments specified in this guide. Note: This setting works in conjunction with, but does not replace, the Consistent MIME Handling settings.

STIG	Date
Microsoft IE Version 7	2012-11-29

Details

Check Text ( C-14573r1_chk )
The policy value for Computer Configuration -> Administrative Templates -> Windows Components -> Internet Explorer -> Security Features -> Mime Sniffing Safety Feature -> "Internet Explorer Processes" will be set to “Enabled”. Procedure: Use the Windows Registry Editor to navigate to the following key: HKLM\Software\Policies\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_MIME_SNIFFING Criteria: If the value (Reserved) is REG_SZ = 1, this is not a finding.

Check Text ( C-14573r1_chk )

The policy value for Computer Configuration -> Administrative Templates -> Windows Components -> Internet Explorer -> Security Features -> Mime Sniffing Safety Feature -> "Internet Explorer Processes" will be set to “Enabled”.

Procedure: Use the Windows Registry Editor to navigate to the following key:

HKLM\Software\Policies\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_MIME_SNIFFING

Criteria: If the value (Reserved) is REG_SZ = 1, this is not a finding.

Fix Text (F-15183r1_fix)
The policy value for Computer Configuration -> Administrative Templates -> Windows Components -> Internet Explorer -> Security Features -> Mime Sniffing Safety Feature -> "Internet Explorer Processes" will be set to “Enabled”. Procedure: Use the Windows Registry Editor to navigate to the following key: HKLM\Software\Policies\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_MIME_SNIFFING Criteria: Set the value (Reserved) to REG_SZ = 1.

Fix Text (F-15183r1_fix)