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Microsoft Excel 2013 Security Technical Implementation Guide

  • Version/Release: V1R8
  • Published: 2024-06-13
  • Released: 2024-07-24
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This Security Technical Implementation Guide is published as a tool to improve the security of Department of Defense (DOD) information systems. The requirements are derived from the National Institute of Standards and Technology (NIST) 800-53 and related documents. Comments or proposed revisions to this document should be sent via e-mail to the following address: disa.stig_spt@mail.mil.
b
Disabling of user name and password syntax from being used in URLs must be enforced.
SC-18 - Medium - CCI-001170 - V-242329 - SV-242329r961092_rule
RMF Control
SC-18
Severity
Medium
CCI
CCI-001170
Version
DTOO104
Vuln IDs
  • V-242329
  • V-17173
Rule IDs
  • SV-242329r961092_rule
  • SV-53609
The Uniform Resource Locator (URL) standard allows user authentication to be included in URL strings in the form http://username:password@example.com. A malicious user might use this URL syntax to create a hyperlink that appears to open a legitimate website but actually opens a deceptive (spoofed) website. For example, the URL http://www.wingtiptoys.com@example.com appears to open http://www.wingtiptoys.com but actually opens http://example.com. To protect users from such attacks, Internet Explorer usually blocks any URLs using this syntax. This functionality can be controlled separately for instances of Internet Explorer spawned by Office applications (for example, if a user clicks a link in an Office document or selects a menu option that loads a web page). If user names and passwords in URLs are allowed, users could be diverted to dangerous web pages, which could pose a security risk.
Checks: C-45604r712247_chk

Verify the policy value for Computer Configuration -> Administrative Templates -> Microsoft Office 2013 (Machine) -> Security Settings -> IE Security "Disable user name and password" is set to "Enabled" and a check in the 'excel.exe' check box is set to present. Procedure: Use the Windows Registry Editor to navigate to the following key: HKLM\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_HTTP_USERNAME_PASSWORD_DISABLE Criteria: If the value excel.exe is REG_DWORD = 1, this is not a finding.

Fix: F-45562r712248_fix

Set the policy value for Computer Configuration -> Administrative Templates -> Microsoft Office 2013 (Machine) -> Security Settings -> IE Security "Disable user name and password" to "Enabled" and place a check in the 'excel.exe' check box.

b
Open/Save actions for Excel 4 macrosheets and add-in files must be blocked.
SC-18 - Medium - CCI-001662 - V-242330 - SV-242330r961086_rule
RMF Control
SC-18
Severity
Medium
CCI
CCI-001662
Version
DTOO105
Vuln IDs
  • V-242330
  • V-26607
Rule IDs
  • SV-242330r961086_rule
  • SV-53610
This setting specifies whether users can open, view, edit, or save files saved in the specified format. Enabling block of the specified format mitigates zero-day security attacks (which are attacks that occur between the time that a vulnerability becomes publicly known and a software update or service pack is available) by temporarily preventing users from opening specific types of files and to prevent a user from opening files that have been saved in earlier and pre-release (beta) Microsoft Office formats.
Checks: C-45605r712250_chk

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center -> File Block Settings "Excel 4 macrosheets and add-in files" is set to "Enabled: Open/Save blocked, use open policy". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\15.0\excel\security\fileblock Criteria: If the value XL4Macros is REG_DWORD = 2, this is not a finding.

Fix: F-45563r712251_fix

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center -> File Block Settings "Excel 4 macrosheets and add-in files" to "Enabled: Open/Save blocked, use open policy".

b
Open/Save actions for Excel 4 workbooks must be blocked.
SC-18 - Medium - CCI-001662 - V-242331 - SV-242331r961086_rule
RMF Control
SC-18
Severity
Medium
CCI
CCI-001662
Version
DTOO106
Vuln IDs
  • V-242331
  • V-26608
Rule IDs
  • SV-242331r961086_rule
  • SV-53611
This setting specifies whether users can open, view, edit, or save files saved in the specified format. Enabling block of the specified format mitigates zero-day security attacks (which are attacks that occur between the time that a vulnerability becomes publicly known and a software update or service pack is available) by temporarily preventing users from opening specific types of files and to prevent a user from opening files that have been saved in earlier and pre-release (beta) Microsoft Office formats.
Checks: C-45606r712253_chk

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center -> File Block Settings "Excel 4 workbooks" is set to "Enabled: Open/Save blocked, use open policy". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\15.0\excel\security\fileblock Criteria: If the value XL4Workbooks is REG_DWORD = 2, this is not a finding.

Fix: F-45564r712254_fix

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center -> File Block Settings "Excel 4 workbooks" to "Enabled: Open/Save blocked, use open policy".

b
Open/Save actions for Excel 4 worksheets must be blocked.
SC-18 - Medium - CCI-001662 - V-242332 - SV-242332r961086_rule
RMF Control
SC-18
Severity
Medium
CCI
CCI-001662
Version
DTOO107
Vuln IDs
  • V-242332
  • V-26609
Rule IDs
  • SV-242332r961086_rule
  • SV-53612
This setting specifies whether users can open, view, edit, or save files saved in the specified format. Enabling block of the specified format mitigates zero-day security attacks (which are attacks that occur between the time that a vulnerability becomes publicly known and a software update or service pack is available) by temporarily preventing users from opening specific types of files and to prevent a user from opening files that have been saved in earlier and pre-release (beta) Microsoft Office formats.
Checks: C-45607r712256_chk

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center -> File Block Settings "Excel 4 worksheets" is set to "Enabled: Open/Save blocked, use open policy". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\15.0\excel\security\fileblock Criteria: If the value XL4Worksheets is REG_DWORD = 2, this is not a finding.

Fix: F-45565r712257_fix

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center -> File Block Settings "Excel 4 worksheets" to "Enabled: Open/Save blocked, use open policy".

b
Actions for Excel 95 workbooks must be configured to edit in Protected View.
SC-18 - Medium - CCI-001662 - V-242333 - SV-242333r961086_rule
RMF Control
SC-18
Severity
Medium
CCI
CCI-001662
Version
DTOO108
Vuln IDs
  • V-242333
  • V-26610
Rule IDs
  • SV-242333r961086_rule
  • SV-53614
This setting specifies whether users can open, view, edit, or save files saved in the specified format. Enabling block of the specified format mitigates zero-day security attacks (which are attacks that occur between the time that a vulnerability becomes publicly known and a software update or service pack is available) by temporarily preventing users from opening specific types of files and to prevent a user from opening files that have been saved in earlier and pre-release (beta) Microsoft Office formats.
Checks: C-45608r712259_chk

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center -> File Block Settings "Excel 95 workbooks" is set to "Enabled: Allow editing and open in Protected View". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\15.0\excel\security\fileblock Criteria: If the value XL95Workbooks is REG_DWORD = 5, this is not a finding.

Fix: F-45566r712260_fix

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center -> File Block Settings "Excel 95 workbooks" to "Enabled: Allow editing and open in Protected View".

b
Actions for Excel 95-97 workbooks and templates must be configured to edit in Protected View.
SC-18 - Medium - CCI-001662 - V-242334 - SV-242334r961086_rule
RMF Control
SC-18
Severity
Medium
CCI
CCI-001662
Version
DTOO109
Vuln IDs
  • V-242334
  • V-26611
Rule IDs
  • SV-242334r961086_rule
  • SV-53615
This setting specifies whether users can open, view, edit, or save files saved in the specified format. Enabling block of the specified format mitigates zero-day security attacks (which are attacks that occur between the time that a vulnerability becomes publicly known and a software update or service pack is available) by temporarily preventing users from opening specific types of files and to prevent a user from opening files that have been saved in earlier and pre-release (beta) Microsoft Office formats.
Checks: C-45609r712262_chk

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center -> File Block Settings "Excel 95-97 workbooks and templates" is set to "Enabled: Allow editing and open in Protected View". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\office\15.0\excel\security\fileblock Criteria: If the value XL9597WorkbooksandTemplates is REG_DWORD = 5, this is not a finding.

Fix: F-45567r712263_fix

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center -> File Block Settings "Excel 95-97 workbooks and templates" to "Enabled: Allow editing and open in Protected View".

b
Blocking as default file block opening behavior must be enforced.
SC-18 - Medium - CCI-001662 - V-242335 - SV-242335r961086_rule
RMF Control
SC-18
Severity
Medium
CCI
CCI-001662
Version
DTOO110
Vuln IDs
  • V-242335
  • V-26612
Rule IDs
  • SV-242335r961086_rule
  • SV-53617
Users can open, view, or edit a large number of file types in Office 2013. Some file types are safer than others, as some could allow malicious code to become active on user computers or the network. For this reason, disabling or not configuring this setting could allow malicious code to become active on user computers or the network.
Checks: C-45610r712265_chk

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center -> File Block Settings "Set default file block behavior" is set to "Enabled: Blocked files are not opened". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\15.0\excel\security\fileblock Criteria: If the value OpenInProtectedView is REG_DWORD = 0, this is not a finding.

Fix: F-45568r712266_fix

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center -> File Block Settings "Set default file block behavior" to "Enabled: Blocked files are not opened".

b
Internet Explorer Bind to Object functionality must be enabled.
SC-18 - Medium - CCI-001695 - V-242336 - SV-242336r960921_rule
RMF Control
SC-18
Severity
Medium
CCI
CCI-001695
Version
DTOO111
Vuln IDs
  • V-242336
  • V-17174
Rule IDs
  • SV-242336r960921_rule
  • SV-53618
Internet Explorer performs a number of safety checks before initializing an ActiveX control. It will not initialize a control if the kill bit for the control is set in the registry, or if the security settings for the zone in which the control is located do not allow it to be initialized. This functionality can be controlled separately for instances of Internet Explorer spawned by Office applications (for example, if a user clicks a link in an Office document or selects a menu option that loads a Web page). A security risk could occur if potentially dangerous controls are allowed to load.
Checks: C-45611r712268_chk

Verify the policy value for Computer Configuration -> Administrative Templates -> Microsoft Office 2013 (Machine) -> Security Settings -> IE Security "Bind to Object" is set to "Enabled" and a check in the 'excel.exe' check box is set to present. Procedure: Use the Windows Registry Editor to navigate to the following key: HKLM\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_SAFE_BINDTOOBJECT Criteria: If the value excel.exe is REG_DWORD = 1, this is not a finding.

Fix: F-45569r712269_fix

Set the policy value for Computer Configuration -> Administrative Templates -> Microsoft Office 2013 (Machine) -> Security Settings -> IE Security "Bind to Object" to "Enabled" and place a check in the 'excel.exe' check box.

b
Open/Save actions for Dif and Sylk files must be blocked.
SC-18 - Medium - CCI-001662 - V-242337 - SV-242337r961086_rule
RMF Control
SC-18
Severity
Medium
CCI
CCI-001662
Version
DTOO112
Vuln IDs
  • V-242337
  • V-26596
Rule IDs
  • SV-242337r961086_rule
  • SV-53620
This setting specifies whether users can open, view, edit, or save files saved in the specified format. Enabling block of the specified format mitigates zero-day security attacks (which are attacks that occur between the time that a vulnerability becomes publicly known and a software update or service pack is available) by temporarily preventing users from opening specific types of files and to prevent a user from opening files that have been saved in earlier and pre-release (beta) Microsoft Office formats.
Checks: C-45612r712271_chk

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center -> File Block Settings "Dif and Sylk files" is set to "Enabled: Open/Save blocked, use open policy". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\15.0\excel\security\fileblock Criteria: If the value DifandSylkFiles is REG_DWORD = 2, this is not a finding.

Fix: F-45570r712272_fix

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center -> File Block Settings "Dif and Sylk files" to "Enabled: Open/Save blocked, use open policy".

b
Open/Save actions for Excel 2 macrosheets and add-in files must be blocked.
SC-18 - Medium - CCI-001662 - V-242338 - SV-242338r961086_rule
RMF Control
SC-18
Severity
Medium
CCI
CCI-001662
Version
DTOO113
Vuln IDs
  • V-242338
  • V-26597
Rule IDs
  • SV-242338r961086_rule
  • SV-53622
This setting specifies whether users can open, view, edit, or save files saved in the specified format. Enabling block of the specified format mitigates zero-day security attacks (which are attacks that occur between the time that a vulnerability becomes publicly known and a software update or service pack is available) by temporarily preventing users from opening specific types of files and to prevent a user from opening files that have been saved in earlier and pre-release (beta) Microsoft Office formats.
Checks: C-45613r712274_chk

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center -> File Block Settings "Excel 2 macrosheets and add-in files" is set to "Enabled: Open/Save blocked, use open policy". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\15.0\excel\security\fileblock Criteria: If the value XL2Macros is REG_DWORD = 2, this is not a finding.

Fix: F-45571r712275_fix

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center -> File Block Settings "Excel 2 macrosheets and add-in files" to "Enabled: Open/Save blocked, use open policy".

b
Open/Save actions for Excel 2 worksheets must be blocked.
SC-18 - Medium - CCI-001662 - V-242339 - SV-242339r961086_rule
RMF Control
SC-18
Severity
Medium
CCI
CCI-001662
Version
DTOO114
Vuln IDs
  • V-242339
  • V-26598
Rule IDs
  • SV-242339r961086_rule
  • SV-53624
This setting specifies whether users can open, view, edit, or save files saved in the specified format. Enabling block of the specified format mitigates zero-day security attacks (which are attacks that occur between the time that a vulnerability becomes publicly known and a software update or service pack is available) by temporarily preventing users from opening specific types of files and to prevent a user from opening files that have been saved in earlier and pre-release (beta) Microsoft Office formats.
Checks: C-45614r712277_chk

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center -> File Block Settings "Excel 2 worksheets" is set to "Enabled: Open/Save blocked, use open policy". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\15.0\excel\security\fileblock Criteria: If the value XL2Worksheets is REG_DWORD = 2, this is not a finding.

Fix: F-45572r712278_fix

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center -> File Block Settings "Excel 2 worksheets" to "Enabled: Open/Save blocked, use open policy".

b
Open/Save actions for Excel 3 macrosheets and add-in files must be blocked.
SC-18 - Medium - CCI-001662 - V-242340 - SV-242340r961086_rule
RMF Control
SC-18
Severity
Medium
CCI
CCI-001662
Version
DTOO115
Vuln IDs
  • V-242340
  • V-26599
Rule IDs
  • SV-242340r961086_rule
  • SV-53626
This setting specifies whether users can open, view, edit, or save files saved in the specified format. Enabling block of the specified format mitigates zero-day security attacks (which are attacks that occur between the time that a vulnerability becomes publicly known and a software update or service pack is available) by temporarily preventing users from opening specific types of files and to prevent a user from opening files that have been saved in earlier and pre-release (beta) Microsoft Office formats.
Checks: C-45615r712280_chk

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center -> File Block Settings "Excel 3 macrosheets and add-in files" is set to "Enabled: Open/Save blocked, use open policy". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\15.0\excel\security\fileblock Criteria: If the value XL3Macros is REG_DWORD = 2, this is not a finding.

Fix: F-45573r712281_fix

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center -> File Block Settings "Excel 3 macrosheets and add-in files" to "Enabled: Open/Save blocked, use open policy".

b
Open/Save actions for Excel 3 worksheets must be blocked.
SC-18 - Medium - CCI-001662 - V-242341 - SV-242341r961086_rule
RMF Control
SC-18
Severity
Medium
CCI
CCI-001662
Version
DTOO116
Vuln IDs
  • V-242341
  • V-26601
Rule IDs
  • SV-242341r961086_rule
  • SV-53628
This setting specifies whether users can open, view, edit, or save files saved in the specified format. Enabling block of the specified format mitigates zero-day security attacks (which are attacks that occur between the time that a vulnerability becomes publicly known and a software update or service pack is available) by temporarily preventing users from opening specific types of files and to prevent a user from opening files that have been saved in earlier and pre-release (beta) Microsoft Office formats.
Checks: C-45616r712283_chk

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center -> File Block Settings "Excel 3 worksheets" is set to "Enabled: Open/Save blocked, use open policy". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\15.0\excel\security\fileblock Criteria: If the value XL3Worksheets is REG_DWORD = 2, this is not a finding.

Fix: F-45574r712284_fix

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center -> File Block Settings "Excel 3 worksheets" to "Enabled: Open/Save blocked, use open policy".

b
The Saved from URL mark must be selected to enforce Internet zone processing.
SC-18 - Medium - CCI-001170 - V-242342 - SV-242342r961092_rule
RMF Control
SC-18
Severity
Medium
CCI
CCI-001170
Version
DTOO117
Vuln IDs
  • V-242342
  • V-17175
Rule IDs
  • SV-242342r961092_rule
  • SV-53629
Typically, when Internet Explorer loads a web page from a Universal Naming Convention (UNC) share that contains a Mark of the Web (MOTW) comment, indicating the page was saved from a site on the Internet, Internet Explorer runs the page in the Internet security zone instead of the less restrictive Local Intranet security zone. This functionality can be controlled separately for instances of Internet Explorer spawned by Office applications (for example, if a user clicks a link in an Office document or selects a menu option that loads a web page). If Internet Explorer does not evaluate the page for a MOTW, potentially dangerous code could be allowed to run.
Checks: C-45617r712286_chk

Verify the policy value for Computer Configuration -> Administrative Templates -> Microsoft Office 2013 (Machine) -> Security Settings -> IE Security "Saved from URL" is set to "Enabled" and a check in the 'excel.exe' check box is set to present. Procedure: Use the Windows Registry Editor to navigate to the following key: HKLM\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_UNC_SAVEDFILECHECK Criteria: If the value excel.exe is REG_DWORD = 1, this is not a finding.

Fix: F-45575r712287_fix

Set the policy value for Computer Configuration -> Administrative Templates -> Microsoft Office 2013 (Machine) -> Security Settings -> IE Security "Saved from URL" to "Enabled" and place a check in the 'excel.exe' check box.

b
Configuration for file validation must be enforced.
SC-18 - Medium - CCI-001695 - V-242343 - SV-242343r960921_rule
RMF Control
SC-18
Severity
Medium
CCI
CCI-001695
Version
DTOO119
Vuln IDs
  • V-242343
  • V-26592
Rule IDs
  • SV-242343r960921_rule
  • SV-53632
Office File Validation helps detect and prevent a kind of exploit known as a file format attack or file fuzzing attack. File format attacks exploit the integrity of a file. They occur when someone modifies the structure of a file with the intent of adding malicious code. Usually the malicious code is run remotely and is used to elevate the privilege of restricted accounts on the computer. As a result, an attacker could gain access to a computer that they did not previously have access to. This could enable an attacker to read sensitive information from the computer's hard disk drive or install malware, such as a worm or a key logging program. The Office File Validation feature helps prevent file format attacks by scanning and validating files before they are opened. To validate files, Office File Validation compares a file's structure to a predefined file schema, which is a set of rules that determine what a readable file looks like. If Office File Validation detects that a file's structure does not follow all rules that are described in the schema, the file does not pass validation.
Checks: C-45618r712289_chk

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security "Turn off file validation" is set to "Disabled". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\15.0\excel\security\filevalidation Criteria: If the value EnableOnLoad is REG_DWORD = 1, this is not a finding.

Fix: F-45576r712290_fix

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security "Turn off file validation" to "Disabled".

a
Open/Save actions for web pages and Excel 2003 XML spreadsheets must be blocked.
SC-18 - Low - CCI-001662 - V-242344 - SV-242344r961086_rule
RMF Control
SC-18
Severity
Low
CCI
CCI-001662
Version
DTOO120
Vuln IDs
  • V-242344
  • V-26613
Rule IDs
  • SV-242344r961086_rule
  • SV-53638
This policy setting allows for determining whether users can open, view, edit, or save Excel files with the format specified by the title
Checks: C-45619r712292_chk

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center -> File Block Settings "Web pages and Excel 2003 XML spreadsheets" is set to "Enabled: Open/Save blocked, use open policy". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\15.0\excel\security\fileblock Criteria: If the value HtmlandXmlssFiles is REG_DWORD = 2, this is not a finding.

Fix: F-45577r712293_fix

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center -> File Block Settings "Web pages and Excel 2003 XML spreadsheets" to "Enabled: Open/Save blocked, use open policy".

b
Files from the Internet zone must be opened in Protected View.
SC-18 - Medium - CCI-001662 - V-242345 - SV-242345r961086_rule
RMF Control
SC-18
Severity
Medium
CCI
CCI-001662
Version
DTOO121
Vuln IDs
  • V-242345
  • V-26614
Rule IDs
  • SV-242345r961086_rule
  • SV-53676
This policy setting allows for determining if files downloaded from the Internet zone open in Protected View. If enabling this policy setting, files downloaded from the Internet zone do not open in Protected View. If disabling or not configuring this policy setting, files downloaded from the Internet zone open in Protected View.
Checks: C-45620r712295_chk

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center -> Protected View "Do not open files from the Internet zone in Protected View" is set to "Disabled". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\15.0\excel\security\protectedview Criteria: If the value DisableInternetFilesInPV is REG_DWORD = 0, this is not a finding.

Fix: F-45578r712296_fix

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center -> Protected View "Do not open files from the Internet zone in Protected View" to "Disabled".

b
Open/Save actions for dBase III / IV files must be blocked.
SC-18 - Medium - CCI-001662 - V-242346 - SV-242346r961086_rule
RMF Control
SC-18
Severity
Medium
CCI
CCI-001662
Version
DTOO122
Vuln IDs
  • V-242346
  • V-26595
Rule IDs
  • SV-242346r961086_rule
  • SV-53678
This setting specifies whether users can open, view, edit, or save files saved in the specified format. Enabling block of the specified format mitigates zero-day security attacks (which are attacks that occur during between the time that a vulnerability becomes publicly known and a software update or service pack is available) by temporarily preventing users from opening specific types of files and to prevent a user from opening files that have been saved in earlier and pre-release (beta) Microsoft Office formats.
Checks: C-45621r712298_chk

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center -> File Block Settings "dBase III / IV files" is set to "Enabled: Open/Save blocked, use open policy". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\15.0\excel\security\fileblock Criteria: If the value DBaseFiles is REG_DWORD = 2, this is not a finding.

Fix: F-45579r712299_fix

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center -> File Block Settings "dBase III / IV files" to "Enabled: Open/Save blocked, use open policy".

b
Navigation to URLs embedded in Office products must be blocked.
SC-18 - Medium - CCI-001170 - V-242347 - SV-242347r961092_rule
RMF Control
SC-18
Severity
Medium
CCI
CCI-001170
Version
DTOO123
Vuln IDs
  • V-242347
  • V-17183
Rule IDs
  • SV-242347r961092_rule
  • SV-53679
To protect users from attacks, Internet Explorer usually does not attempt to load malformed URLs. This functionality can be controlled separately for instances of Internet Explorer spawned by Office applications (for example, if a user clicks a link in an Office document or selects a menu option that loads a Web page). If Internet Explorer attempts to load a malformed URL, a security risk could occur.
Checks: C-45622r712301_chk

Verify the policy value for Computer Configuration -> Administrative Templates -> Microsoft Office 2013 (Machine) -> Security Settings -> IE Security "Navigate URL" is set to "Enabled" and a check in the 'excel.exe' check box is set to present. Procedure: Use the Windows Registry Editor to navigate to the following key: HKLM\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_VALIDATE_NAVIGATE_URL Criteria: If the value excel.exe is REG_DWORD = 1, this is not a finding

Fix: F-45580r712302_fix

Set the policy value for Computer Configuration -> Administrative Templates -> Microsoft Office 2013 (Machine) -> Security Settings -> IE Security "Navigate URL" to "Enabled" and place a check in the 'excel.exe' check box.

b
Scripted Window Security must be enforced.
SC-18 - Medium - CCI-001695 - V-242348 - SV-242348r960921_rule
RMF Control
SC-18
Severity
Medium
CCI
CCI-001695
Version
DTOO124
Vuln IDs
  • V-242348
  • V-26588
Rule IDs
  • SV-242348r960921_rule
  • SV-53680
Malicious websites often try to confuse or trick users into giving a site permission to perform an action allowing the site to take control of the users' computers in some manner. Disabling or not configuring this setting allows unknown websites to: -Create browser windows appearing to be from the local operating system. -Draw active windows displaying outside of the viewable areas of the screen capturing keyboard input. -Overlay parent windows with their own browser windows to hide important system information, choices or prompts.
Checks: C-45623r712304_chk

Verify the policy value for Computer Configuration -> Administrative Templates -> Microsoft Office 2013 (Machine) -> Security Settings -> IE Security "Scripted Window Security Restrictions" is set to "Enabled" and 'excel.exe' is checked. Procedure: Use the Windows Registry Editor to navigate to the following key: HKLM\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_WINDOW_RESTRICTIONS Criteria: If the value excel.exe is REG_DWORD = 1, this is not a finding.

Fix: F-45581r712305_fix

Set the policy value for Computer Configuration -> Administrative Templates -> Microsoft Office 2013 (Machine) -> Security Settings -> IE Security "Scripted Window Security Restrictions" to "Enabled" and 'excel.exe' is checked.

b
Add-on Management functionality must be allowed.
SC-18 - Medium - CCI-001662 - V-242349 - SV-242349r961086_rule
RMF Control
SC-18
Severity
Medium
CCI
CCI-001662
Version
DTOO126
Vuln IDs
  • V-242349
  • V-26584
Rule IDs
  • SV-242349r961086_rule
  • SV-53681
Internet Explorer add-ons are pieces of code, run in Internet Explorer, to provide additional functionality. Rogue add-ons may contain viruses or other malicious code. Disabling or not configuring this setting could allow malicious code or users to become active on user computers or the network. For example, a malicious user can monitor and then use keystrokes users type into Internet Explorer. Even legitimate add-ons may demand resources, compromising the performance of Internet Explorer, and the operating systems for user computers.
Checks: C-45624r712307_chk

Verify the policy value for Computer Configuration -> Administrative Templates -> Microsoft Office 2013 (Machine) -> Security Settings -> IE Security "Add-on Management" is set to Enabled" and 'excel.exe' is checked. Procedure: Use the Windows Registry Editor to navigate to the following key: HKLM\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_ADDON_MANAGEMENT Criteria: If the value excel.exe is REG_DWORD = 1, this is not a finding.

Fix: F-45582r712308_fix

Set the policy value for Computer Configuration -> Administrative Templates -> Microsoft Office 2013 (Machine) -> Security Settings -> IE Security "Add-on Management" to "Enabled" and 'excel.exe' is checked.

b
Add-ins to Office applications must be signed by a Trusted Publisher.
CM-5 - Medium - CCI-001749 - V-242350 - SV-242350r960954_rule
RMF Control
CM-5
Severity
Medium
CCI
CCI-001749
Version
DTOO127
Vuln IDs
  • V-242350
  • V-26589
Rule IDs
  • SV-242350r960954_rule
  • SV-53682
Office 2013 applications do not, by default, check the digital signature on application add-ins before opening them. Disabling or not configuring this setting may allow an application to load a dangerous add-in. As a result, malicious code could become active on user computers or the network.
Checks: C-45625r712310_chk

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center "Require that application add-ins are signed by Trusted Publisher" is set to "Enabled". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\15.0\excel\security Criteria: If the value RequireAddinSig is REG_DWORD = 1, this is not a finding.

Fix: F-45583r712311_fix

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center "Require that application add-ins are signed by Trusted Publisher" to "Enabled".

b
Links that invoke instances of Internet Explorer from within an Office product must be blocked.
SC-18 - Medium - CCI-001662 - V-242351 - SV-242351r961086_rule
RMF Control
SC-18
Severity
Medium
CCI
CCI-001662
Version
DTOO129
Vuln IDs
  • V-242351
  • V-17184
Rule IDs
  • SV-242351r961086_rule
  • SV-53683
The "Pop-up Blocker" feature in Internet Explorer can be used to block most unwanted pop-up and pop-under windows from appearing. This functionality can be controlled separately for instances of Internet Explorer spawned by Office applications (for example, if a user clicks a link in an Office document or selects a menu option that loads a web page). If the Pop-up Blocker is disabled, disruptive and potentially dangerous pop-up windows could load and present a security risk.
Checks: C-45626r712313_chk

Verify the policy value for Computer Configuration -> Administrative Templates -> Microsoft Office 2013 (Machine) -> Security Settings -> IE Security "Block popups" is set to "Enabled" and 'excel.exe' is checked. Procedure: Use the Windows Registry Editor to navigate to the following key: HKLM\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_WEBOC_POPUPMANAGEMENT Criteria: If the value excel.exe is REG_DWORD = 1, this is not a finding.

Fix: F-45584r712314_fix

Set the policy value for Computer Configuration -> Administrative Templates -> Microsoft Office 2013 (Machine) -> Security Settings -> IE Security "Block popups" to "Enabled" and select 'excel.exe'.

b
Trust Bar Notifications for unsigned application add-ins must be blocked.
CM-5 - Medium - CCI-001749 - V-242352 - SV-242352r960954_rule
RMF Control
CM-5
Severity
Medium
CCI
CCI-001749
Version
DTOO131
Vuln IDs
  • V-242352
  • V-17187
Rule IDs
  • SV-242352r960954_rule
  • SV-53711
If an application is configured to require all add-ins to be signed by a trusted publisher, any unsigned add-ins the application loads will be disabled and the application will display the Trust Bar at the top of the active window. The Trust Bar contains a message informing users about the unsigned add-in. If a user is allowed to make the determination to allow an unsigned add-in, it increases the risk of malicious code being introduced onto the user's computer or the network.
Checks: C-45627r712316_chk

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center "Disable Trust Bar Notification for unsigned application add-ins and block them" is set to "Enabled". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\15.0\excel\security Criteria: If the value NoTBPromptUnsignedAddin is REG_DWORD = 1, this is not a finding.

Fix: F-45585r712317_fix

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center "Disable Trust Bar Notification for unsigned application add-ins and block them" to "Enabled".

b
File downloads must be configured for proper restrictions.
SC-18 - Medium - CCI-001169 - V-242353 - SV-242353r961089_rule
RMF Control
SC-18
Severity
Medium
CCI
CCI-001169
Version
DTOO132
Vuln IDs
  • V-242353
  • V-26587
Rule IDs
  • SV-242353r961089_rule
  • SV-53713
Disabling this setting allows websites to present file download prompts via code without the user specifically initiating the download. User preferences may also allow the download to occur without prompting or interaction with the user. Even if Internet Explorer prompts the user to accept the download, some websites abuse this functionality. Malicious websites may continually prompt users to download a file or present confusing dialog boxes to trick users into downloading or running a file. If the download occurs and it contains malicious code, the code could become active on user computers or the network.
Checks: C-45628r712319_chk

Verify the policy value for Computer Configuration -> Administrative Templates -> Microsoft Office 2013 (Machine) -> Security Settings -> IE Security "Restrict File Download" is set to "Enabled" and 'excel.exe' is checked. Procedure: Use the Windows Registry Editor to navigate to the following key: HKLM\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_RESTRICT_FILEDOWNLOAD Criteria: If the value excel.exe is REG_DWORD = 1, this is not a finding.

Fix: F-45586r712320_fix

Set the policy value for Computer Configuration -> Administrative Templates -> Microsoft Office 2013 (Machine) -> Security Settings -> IE Security "Restrict File Download" to "Enabled" and 'excel.exe' is checked.

b
All automatic loading from trusted locations must be disabled.
SC-18 - Medium - CCI-001170 - V-242354 - SV-242354r961092_rule
RMF Control
SC-18
Severity
Medium
CCI
CCI-001170
Version
DTOO133
Vuln IDs
  • V-242354
  • V-17471
Rule IDs
  • SV-242354r961092_rule
  • SV-53723
Trusted locations specified in the Trust Center are used to define file locations assumed to be safe. Content, code, and add-ins are allowed to load from trusted locations with a minimal amount of security, without prompting the users for permission. If a dangerous file is opened from a trusted location, it will not be subject to standard security measures and could harm users' computers or data. By default, files located in trusted locations (those specified in the Trust Center) are assumed to be safe.
Checks: C-45629r712322_chk

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center -> Trusted Locations "Disable all trusted locations" is set to Enabled". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\15.0\excel\security\trusted locations Criteria: If the value AllLocationsDisabled is REG_DWORD = 1, this is not a finding.

Fix: F-45587r712323_fix

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center -> Trusted Locations "Disable all trusted locations" to "Enabled".

b
Disallowance of trusted locations on the network must be enforced.
SC-18 - Medium - CCI-001170 - V-242355 - SV-242355r961092_rule
RMF Control
SC-18
Severity
Medium
CCI
CCI-001170
Version
DTOO134
Vuln IDs
  • V-242355
  • V-17520
Rule IDs
  • SV-242355r961092_rule
  • SV-53724
Files located in trusted locations and specified in the Trust Center are typically assumed to be safe. Content, code, and add-ins are allowed to load from trusted locations with minimal security and without prompting the user for permission. By default, users can specify "Trusted Locations" on network shares, or in other remote locations not under their direct control, by selecting the "Allow Trusted Locations on my network" (not recommended) check box in the "Trusted Locations" section of the Trust Center. If a dangerous file is opened from a trusted location, it will not be subject to typical security measures and could affect users' computers or data.
Checks: C-45630r712325_chk

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center -> Trusted Locations "Allow Trusted Locations on the network" is set to Disabled". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\15.0\excel\security\trusted locations Criteria: If the value AllowNetworkLocations is REG_DWORD = 0, this is not a finding.

Fix: F-45588r712326_fix

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center -> Trusted Locations "Allow Trusted Locations on the network" to "Disabled".

b
Internet links and Network UNCs created as embedded hyperlinks must be prevented.
SC-18 - Medium - CCI-001170 - V-242356 - SV-242356r961092_rule
RMF Control
SC-18
Severity
Medium
CCI
CCI-001170
Version
DTOO138
Vuln IDs
  • V-242356
  • V-17650
Rule IDs
  • SV-242356r961092_rule
  • SV-53725
When users type a string of characters, Excel recognizes as a Uniform Resource Locator (URL) or Uniform Naming Convention (UNC) path to a resource on the Internet or a local network, Excel will transform it into a hyperlink. Clicking the hyperlink opens it in the configured default web browser or the appropriate application. This functionality can enable users to accidentally create links to dangerous or restricted resources, which could create a security risk.
Checks: C-45631r712328_chk

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Proofing -> Autocorrect Options "Internet and network paths as hyperlinks" is set to "Disabled". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\15.0\excel\options If the value AutoHyperlink is REG_DWORD = 0, this is not a finding.

Fix: F-45589r712329_fix

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Proofing -> Autocorrect Options "Internet and network paths as hyperlinks" to "Disabled".

b
The Save commands default file format must be configured.
CM-7 - Medium - CCI-000381 - V-242357 - SV-242357r960963_rule
RMF Control
CM-7
Severity
Medium
CCI
CCI-000381
Version
DTOO139
Vuln IDs
  • V-242357
  • V-17521
Rule IDs
  • SV-242357r960963_rule
  • SV-53726
When users create new Excel files, Excel 2013 saves them in the new *.xlsx format. Ensure this setting is enabled to specify all new files are created in Excel 2013. If a new file is created in an earlier format, some users may not be able to open or use the file, or they may choose a format that is less secure than the Excel 2013 format. Users can still select a specific format when they save files, but they cannot change the default of this setting from the "Excel Options" dialog box. This enforced user behavior ensures any change to the file format requires additional deliberate user interaction.
Checks: C-45632r712331_chk

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Save "default file format" is set to "Enabled (Excel Workbook *.xlsx)". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\15.0\excel\options Criteria: If the value DefaultFormat is REG_DWORD = 0x00000033(hex) or 51 (Decimal), this is not a finding.

Fix: F-45590r712332_fix

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Save "default file format" to "Enabled (Excel Workbook *.xlsx)".

b
Automatic republish to web pages must be disallowed.
CM-6 - Medium - CCI-000366 - V-242358 - SV-242358r961863_rule
RMF Control
CM-6
Severity
Medium
CCI
CCI-000366
Version
DTOO140
Vuln IDs
  • V-242358
  • V-17652
Rule IDs
  • SV-242358r961863_rule
  • SV-53731
If users choose to publish Excel data to a static web page and enable the AutoRepublish feature, Excel saves a copy of the data to the web page every time the user saves the workbook. If the page is on a web server, anyone who has access to the page will be able to see the updated data after every save, which can lead to the undesired disclosure of sensitive or incorrect information. By default, a message dialog box displays every time the user saves a published workbook when AutoRepublish is enabled. From this dialog box, the user can disable AutoRepublish temporarily or permanently, or select "Do not show this message again" to prevent the dialog box from appearing after every save. If the user selects "Do not show this message again", Excel will continue to automatically republish the data after every save without informing the user.
Checks: C-45633r712334_chk

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Save "Disable AutoRepublish" is set to "Enabled". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\15.0\excel\options Criteria: If the value DisableAutoRepublish is REG_DWORD = 1, this is not a finding.

Fix: F-45591r712335_fix

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Save "Disable AutoRepublish" to "Enabled".

b
The AutoRepublish warning alert must be provided.
CM-6 - Medium - CCI-000366 - V-242359 - SV-242359r961863_rule
RMF Control
CM-6
Severity
Medium
CCI
CCI-000366
Version
DTOO141
Vuln IDs
  • V-242359
  • V-17744
Rule IDs
  • SV-242359r961863_rule
  • SV-53803
AutoRepublish is a feature in Excel allowing workbooks to be automatically republished to the World Wide Web each time the workbook is saved. A number of changes might need to be made to allow the workbook to be successfully published, including the following: * External references are converted to values. * Hidden formulas become visible. * The "Set precision as displayed" option, which appears beneath the "When calculating this workbook" heading in the "Advanced" section of the "Excel Options" dialog box, is no longer available. These types of changes can mean the version on the web page might not be the same as the Excel file. By default, a message dialog box appears every time the user saves a published workbook when AutoRepublish is enabled. From this dialog box, the user can disable AutoRepublish temporarily or permanently, or select "Do not show this message again" to prevent the dialog box from appearing after every save. If the user selects "Do not show this message again", Excel will continue to automatically republish the data after every save without informing the user.
Checks: C-45634r712337_chk

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Save "Do not show AutoRepublish warning alert" is set to "Disabled". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\15.0\excel\options Criteria: If the value DisableAutoRepublishWarning is REG_DWORD = 0, this is not a finding.

Fix: F-45592r712338_fix

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Save "Do not show AutoRepublish warning alert" to "Disabled".

b
The scanning of encrypted macros in open XML documents must be enforced.
SC-18 - Medium - CCI-001170 - V-242360 - SV-242360r961092_rule
RMF Control
SC-18
Severity
Medium
CCI
CCI-001170
Version
DTOO142
Vuln IDs
  • V-242360
  • V-17473
Rule IDs
  • SV-242360r961092_rule
  • SV-53810
When an Office Open XML document (Word, Excel, and PowerPoint) is rights-managed, or password-protected, any macros embedded in the document are encrypted along with the rest of the contents. By default, these encrypted macros will be disabled unless they are scanned by antivirus software immediately before being loaded. If this default configuration is modified, Office products will not require encrypted macros to be scanned before loading. They will be handled as specified by the Office System macro security settings, which can cause macro viruses to load undetected and lead to data loss or reduced application functionality.
Checks: C-45635r712340_chk

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security "Scan encrypted macros in Excel Open XML workbooks" is set to "Enabled: Scan encrypted macros (default)". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\15.0\excel\security Criteria: If the value ExcelBypassEncryptedMacroScan is REG_DWORD = 0, this is not a finding.

Fix: F-45593r712341_fix

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security "Scan encrypted macros in Excel Open XML workbooks" to "Enabled: Scan encrypted macros (default)".

b
File types must be configured to provide mismatch warnings
SI-3 - Medium - CCI-001243 - V-242361 - SV-242361r961197_rule
RMF Control
SI-3
Severity
Medium
CCI
CCI-001243
Version
DTOO143
Vuln IDs
  • V-242361
  • V-17621
Rule IDs
  • SV-242361r961197_rule
  • SV-53811
Excel can load files with extensions that do not match the files' type. For example, if a comma-separated values (CSV) file named example.csv is renamed example.xls, Excel can properly load it as a CSV file. Some attacks target specific file formats. If Excel is allowed to load files with extensions that do not match their file types, a malicious individual can deceive users into loading dangerous files that have incorrect extensions. By default, if users attempt to open files with the wrong extension, Excel opens the file and displays a warning that the file type is not what Excel expected.
Checks: C-45636r712343_chk

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security "Force file extension to match file type" is set to "Enabled (Allow different, but warn)". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\15.0\excel\security Criteria: If the value ExtensionHardening is REG_DWORD = 1, this is not a finding.

Fix: F-45594r712344_fix

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security "Force file extension to match file type" to "Enabled (Allow different, but warn)".

b
Macro storage must be in personal macro workbooks.
SC-18 - Medium - CCI-001170 - V-242362 - SV-242362r961092_rule
RMF Control
SC-18
Severity
Medium
CCI
CCI-001170
Version
DTOO145
Vuln IDs
  • V-242362
  • V-17804
Rule IDs
  • SV-242362r961092_rule
  • SV-53812
The Record Macro dialog box includes a drop-down menu allowing users to choose whether to store the new macro in the current workbook, a new workbook, or their personal macro workbook (Personal.xlsb), a hidden workbook that opens every time Excel starts. By default, Excel displays the Record Macro dialog box with "This Workbook already selected" in the drop-down menu. If a user saves a macro in the active workbook and then distributes the workbook to others, the macro is distributed along with the workbook, which could put workbook data at risk if the macro is triggered accidentally or intentionally.
Checks: C-45637r712346_chk

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center "Store macro in Personal Macro Workbook by default" is set to "Enabled". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\15.0\excel\options\binaryoptions Criteria: If the value fGlobalSheet_37_1 is REG_DWORD = 1, this is not a finding.

Fix: F-45595r712347_fix

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center "Store macro in Personal Macro Workbook by default" to "Enabled".

b
Trust access for VBA must be disallowed.
CM-7 - Medium - CCI-000381 - V-242363 - SV-242363r960963_rule
RMF Control
CM-7
Severity
Medium
CCI
CCI-000381
Version
DTOO146
Vuln IDs
  • V-242363
  • V-17522
Rule IDs
  • SV-242363r960963_rule
  • SV-53813
VSTO projects require access to the Visual Basic for Applications project system in Excel, PowerPoint, and Word, even though the projects do not use Visual Basic for Applications. Design-time support of controls in both Visual Basic and C# projects depends on the Visual Basic for Applications project system in Word and Excel. By default, Excel, Word, and PowerPoint do not allow automation clients to have programmatic access to VBA projects. Users can enable this by selecting the Trust access to the VBA project object model in the Macro Settings section of the Trust Center. However, doing so allows macros in any documents the user opens to access the core Visual Basic objects, methods, and properties, which represents a potential security hazard.
Checks: C-45638r712349_chk

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center "Trust access to Visual Basic Project" is set to "Disabled". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\15.0\excel\security Criteria: If the value AccessVBOM is REG_DWORD = 0, this is not a finding.

Fix: F-45596r712350_fix

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center "Trust access to Visual Basic Project" to "Disabled".

b
The Update of automatic links setting must be configured to prompt user before allowing links to be updated.
SI-3 - Medium - CCI-001243 - V-242364 - SV-242364r961197_rule
RMF Control
SI-3
Severity
Medium
CCI
CCI-001243
Version
DTOO150
Vuln IDs
  • V-242364
  • V-17732
Rule IDs
  • SV-242364r961197_rule
  • SV-53815
If an Excel workbook contains links to other documents and users are not prompted to approve them, the contents of the workbook might change without the users' knowledge because the linked files have changed. This has the risk of introducing corrupt or malicious content into the document. Prompting the user to update links will allow the content to be updated only with the user's knowledge.
Checks: C-45639r712352_chk

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel options -> Advanced -> "Ask to update automatic links" is set to "Enabled". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\software\policies\Microsoft\office\15.0\excel\options\binaryoptions Criteria: If the value fupdateext_78_1 is REG_DWORD = 0, this is not a finding.

Fix: F-45597r712353_fix

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel options -> Advanced -> "Ask to update automatic links" to "Enabled".

b
The loading of images from web pages must not be allowed.
SC-18 - Medium - CCI-001170 - V-242365 - SV-242365r961092_rule
RMF Control
SC-18
Severity
Medium
CCI
CCI-001170
Version
DTOO152
Vuln IDs
  • V-242365
  • V-17751
Rule IDs
  • SV-242365r961092_rule
  • SV-53820
When users open web pages in Excel, Excel loads any graphics included in the pages, regardless of whether or not they were originally created in Excel. Allowing Excel to load graphics created in other programs can make Excel vulnerable to possible future zero-day attacks using graphic files as an attack vector. If such an event occurs, this setting can be used to mitigate the vulnerability.
Checks: C-45640r712355_chk

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Advanced -> Web Options -> General "Load pictures from Web pages not created in Excel" is set to "Disabled". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\15.0\excel\internet Criteria: If the value "DoNotLoadPictures" is REG_DWORD = 1, this is not a finding.

Fix: F-45598r712356_fix

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Advanced -> Web Options -> General "Load pictures from Web pages not created in Excel" to "Disabled".

b
Protection from zone elevation must be enforced.
SC-18 - Medium - CCI-001695 - V-242366 - SV-242366r960921_rule
RMF Control
SC-18
Severity
Medium
CCI
CCI-001695
Version
DTOO209
Vuln IDs
  • V-242366
  • V-26585
Rule IDs
  • SV-242366r960921_rule
  • SV-53822
Internet Explorer places restrictions on each web page users can use the browser to open. Web pages on a user's local computer have the fewest security restrictions and reside in the Local Machine zone, making this security zone a prime target for malicious users and code. Disabling or not configuring this setting could allow pages in the Internet zone to navigate to pages in the Local Machine zone to then run code to elevate privileges. This could allow malicious code or users to become active on user computers or the network.
Checks: C-45641r712358_chk

Verify the policy value for Computer Configuration -> Administrative Templates -> Microsoft Office 2013 (Machine) -> Security Settings -> IE Security "Protection From Zone Elevation" is set to Enabled" and 'excel.exe' is checked. Procedure: Use the Windows Registry Editor to navigate to the following key: HKLM\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_ZONE_ELEVATION Criteria: If the value excel.exe is REG_DWORD = 1, this is not a finding.

Fix: F-45599r712359_fix

Set the policy value for Computer Configuration -> Administrative Templates -> Microsoft Office 2013 (Machine) -> Security Settings -> IE Security "Protection From Zone Elevation" to "Enabled" and 'excel.exe' is checked.

b
The opening of pre-release versions of file formats new to Excel 2013 through the Compatibility Pack for Office 2013 and Excel 2013 Converter must be blocked.
CM-7 - Medium - CCI-001764 - V-242367 - SV-242367r961473_rule
RMF Control
CM-7
Severity
Medium
CCI
CCI-001764
Version
DTOO210
Vuln IDs
  • V-242367
  • V-17322
Rule IDs
  • SV-242367r961473_rule
  • SV-53824
By default, users are prompted to update automatic links.
Checks: C-45642r712361_chk

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Office 2013 -> Office 2013 Converters -> "Block opening of pre-release versions of file formats new to Excel 2013 through the Compatibility Pack for Office 2013 and Excel 2013 Converter" is set to "Enabled". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\software\policies\Microsoft\office\15.0\excel\security\fileblock Criteria: If the value excel12betafilesfromconverters is REG_DWORD = 1, this is not a finding.

Fix: F-45600r712362_fix

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Office 2013 -> Office 2013 Converters -> "Block opening of pre-release versions of file formats new to Excel 2013 through the Compatibility Pack for Office 2013 and Excel 2013 Converter" to "Enabled".

b
ActiveX Installs must be configured for proper restriction.
SC-18 - Medium - CCI-002460 - V-242368 - SV-242368r961779_rule
RMF Control
SC-18
Severity
Medium
CCI
CCI-002460
Version
DTOO211
Vuln IDs
  • V-242368
  • V-26586
Rule IDs
  • SV-242368r961779_rule
  • SV-53827
Microsoft ActiveX controls allow unmanaged, unprotected code to run on the user computers. ActiveX controls do not run within a protected container in the browser like the other types of HTML or Microsoft Silverlight-based controls. Disabling or not configuring this setting does not block prompts for ActiveX control installations and these prompts display to users. This could allow malicious code to become active on user computers or the network.
Checks: C-45643r712364_chk

Verify the policy value for Computer Configuration -> Administrative Templates -> Microsoft Office 2013 (Machine) -> Security Settings -> IE Security "Restrict ActiveX Install" is set to Enabled" and 'excel.exe' is checked. Procedure: Use the Windows Registry Editor to navigate to the following key: HKLM\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_RESTRICT_ACTIVEXINSTALL Criteria: If the value excel.exe is REG_DWORD = 1, this is not a finding.

Fix: F-45601r712365_fix

Set the policy value for Computer Configuration -> Administrative Templates -> Microsoft Office 2013 (Machine) -> Security Settings -> IE Security "Restrict ActiveX Install" to "Enabled" and 'excel.exe' is checked.

b
Files in unsafe locations must be opened in Protected View.
SC-18 - Medium - CCI-001170 - V-242369 - SV-242369r961092_rule
RMF Control
SC-18
Severity
Medium
CCI
CCI-001170
Version
DTOO288
Vuln IDs
  • V-242369
  • V-26615
Rule IDs
  • SV-242369r961092_rule
  • SV-53831
This policy setting determines whether files located in unsafe locations will open in Protected View. If unsafe locations have not been specified, only the "Downloaded Program Files" and "Temporary Internet Files" folders are considered unsafe locations. If enabling this policy setting, files located in unsafe locations do not open in Protected View. If disabling or not configuring this policy setting, files located in unsafe locations open in Protected View.
Checks: C-45644r712367_chk

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center -> Protected View "Do not open files in unsafe locations in Protected View" is set to "Disabled". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\15.0\excel\security\protectedview Criteria: If the value DisableUnsafeLocationsInPV is REG_DWORD = 0, this is not a finding.

Fix: F-45602r712368_fix

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center -> Protected View "Do not open files in unsafe locations in Protected View" to "Disabled".

b
Document behavior if file validation fails must be set.
SC-18 - Medium - CCI-001170 - V-242370 - SV-242370r961092_rule
RMF Control
SC-18
Severity
Medium
CCI
CCI-001170
Version
DTOO292
Vuln IDs
  • V-242370
  • V-26616
Rule IDs
  • SV-242370r961092_rule
  • SV-53834
This policy key controls how Office documents should be handled when failing file validation. By requiring such documents to be opened in Protected View, any potentially malicious code would be disabled, allowing the user to edit the document and resave correctly.
Checks: C-45645r712370_chk

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center -> Protected View "Set document behavior if file validation fails" is set to "Enabled: Open in Protected View" and Unchecked for "Do not allow edit". Procedure: Use the Windows Registry Editor to navigate to the following keys: If both HKCU\Software\Policies\Microsoft\Office\15.0\excel\security\filevalidation\OpenInProtectedView is set to REG_DWORD = 1 and HKCU\Software\Policies\Microsoft\Office\15.0\excel\security\filevalidation\DisableEditFromPV is set to REG_DWORD = 1, this is not a finding. If either, or both keys, is not set to REG_DWORD = 1, this is a finding.

Fix: F-45603r712371_fix

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center -> Protected View "Set document behavior if file validation fails" to "Enabled: Open in Protected View" and Unchecked for "Do not allow edit".

b
Excel attachments opened from Outlook must be in Protected View.
SC-18 - Medium - CCI-001170 - V-242371 - SV-242371r961092_rule
RMF Control
SC-18
Severity
Medium
CCI
CCI-001170
Version
DTOO293
Vuln IDs
  • V-242371
  • V-26617
Rule IDs
  • SV-242371r961092_rule
  • SV-53837
This policy setting allows for determining whether Excel files in Outlook attachments open in Protected View. If enabling this policy setting, Outlook attachments do not open in Protected View. If disabling or not configuring this policy setting, Outlook attachments open in Protected View.
Checks: C-45646r712373_chk

The policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center -> Protected View Turn off Protected View for attachments opened from Outlook" must be set to Disabled". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\15.0\Excel\security\protectedview Criteria: If the value DisableAttachmentsInPV is REG_DWORD = 0, this is not a finding.

Fix: F-45604r712374_fix

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center -> Protected View "Turn off Protected View for attachments opened from Outlook" to "Disabled".

b
Warning Bar settings for VBA macros must be configured.
CM-7 - Medium - CCI-000381 - V-242372 - SV-242372r960963_rule
RMF Control
CM-7
Severity
Medium
CCI
CCI-000381
Version
DTOO304
Vuln IDs
  • V-242372
  • V-17545
Rule IDs
  • SV-242372r960963_rule
  • SV-53838
When users open files containing VBA macros, applications open the files with the macros disabled and displays the Trust Bar with a warning that macros are present and have been disabled. Users may then enable these macros by clicking "Options" on the Trust Bar and selecting the option to enable them. Disabling or not configuring this setting may allow dangerous macros to become active on user computers or the network.
Checks: C-45647r712376_chk

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center "VBA Macro Notification Settings" is set to "Enabled: Disable all with notification". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\15.0\excel\security Criteria: If the value VBAWarnings is REG_DWORD = 2, this is not a finding.

Fix: F-45605r712377_fix

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center "VBA Macro Notification Settings" to "Enabled: Disable all with notification".

b
WEBSERVICE functions must be disabled.
SC-18 - Medium - CCI-001662 - V-242373 - SV-242373r961086_rule
RMF Control
SC-18
Severity
Medium
CCI
CCI-001662
Version
DTOO418
Vuln IDs
  • V-242373
  • V-41344
Rule IDs
  • SV-242373r961086_rule
  • SV-53841
The WEBSERVICE function option, when used in an Excel spreadsheet, returns data from a web service on the Internet or Intranet. If allowed to be used, security is significantly reduced by allowing information disclosure to third party web services and could potentially introduce malicious content to the local network. The WEBSERVICE function must be disabled in Excel and configured to notify user if a WEBSERVICE function is present in an Excel spreadsheet.
Checks: C-45648r712379_chk

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> " WEBSERVICE Function Notification Settings" is set to "Enabled: Disable all with notifications". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\software\policies\Microsoft\office\15.0\excel\security Criteria: If the value webservicefunctionwarnings is REG_DWORD = 1, this is not a finding.

Fix: F-45606r712380_fix

Set policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> " WEBSERVICE Function Notification Settings" is set to "Enabled: Disable all with notifications".

b
Corrupt workbook options must be disallowed.
SC-18 - Medium - CCI-001662 - V-242374 - SV-242374r961086_rule
RMF Control
SC-18
Severity
Medium
CCI
CCI-001662
Version
DTOO419
Vuln IDs
  • V-242374
  • V-41346
Rule IDs
  • SV-242374r961086_rule
  • SV-53843
This setting controls whether Excel presents users with a list of data extraction options before beginning an Open and Repair operation when users choose to open a corrupt workbook in repair or extract mode. A corrupt Excel file may be indicative of malicious tampering. By allowing the automatic handling of corrupt spreadsheets, malicious code may be introduced to the user's computer and the network.
Checks: C-45649r712382_chk

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Data Recovery -> "Do not show data extraction options when opening corrupt workbooks" is set to "Enabled". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\software\policies\microsoft\office\15.0\excel\options Criteria: If the value extractdatadisableui is REG_DWORD = 1, this is not a finding.

Fix: F-45607r712383_fix

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Data Recovery -> "Do not show data extraction options when opening corrupt workbooks" to "Enabled".

b
Macros must be blocked from running in Office 2013 files from the Internet.
SC-18 - Medium - CCI-001170 - V-242375 - SV-242375r961092_rule
RMF Control
SC-18
Severity
Medium
CCI
CCI-001170
Version
DTOO600
Vuln IDs
  • V-242375
  • V-72831
Rule IDs
  • SV-242375r961092_rule
  • SV-87483
This policy setting allows you to block macros from running in Office files that come from the Internet. If you enable this policy setting, macros are blocked from running, even if "Enable all macros" is selected in the Macro Settings section of the Trust Center. Also, instead of having the choice to "Enable Content", users will receive a notification that macros are blocked from running. If the Office file is saved to a trusted location or was previously trusted by the user, macros will be allowed to run. If you disable or don't configure this policy setting, the settings configured in the Macro Settings section of the Trust Center determine whether macros run in Office files that come from the Internet.
Checks: C-45650r712385_chk

Verify the policy value for User Configuration >> Administrative Templates >> Microsoft Excel 2013 >> Excel Options >> Security >> Trust Center "Block macros from running in Office files from the Internet" is set to "Enabled". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\15.0\excel\security Criteria: If the value blockcontentexecutionfrominternet is REG_DWORD = 1, this is not a finding.

Fix: F-45608r712386_fix

Set the policy value for User Configuration >> Administrative Templates >> Microsoft Excel 2013 >> Excel Options >> Security >> Trust Center "Block macros from running in Office files from the Internet" to "Enabled".

c
The version of Excel running on the system must be a supported version.
SI-2 - High - CCI-002605 - V-265890 - SV-265890r999874_rule
RMF Control
SI-2
Severity
High
CCI
CCI-002605
Version
DTOO999-Excel13
Vuln IDs
  • V-265890
Rule IDs
  • SV-265890r999874_rule
Security flaws with software applications are discovered daily. Vendors are constantly updating and patching their products to address newly discovered security vulnerabilities. Organizations (including any contractor to the organization) are required to promptly install security-relevant software updates (e.g., patches, service packs, and hot fixes). Flaws discovered during security assessments, continuous monitoring, incident response activities, or information system error handling must also be addressed expeditiously. Organization-defined time periods for updating security-relevant software may vary based on a variety of factors including, for example, the security category of the information system or the criticality of the update (i.e., severity of the vulnerability related to the discovered flaw). This requirement will apply to software patch management solutions that are used to install patches across the enclave and also to applications themselves that are not part of that patch management solution. For example, many browsers today provide the capability to install their own patch software. Patch criticality, as well as system criticality will vary. Therefore, the tactical situations regarding the patch management process will also vary. This means that the time period used must be a configurable parameter. Time frames for application of security-relevant software updates may be dependent upon the Information Assurance Vulnerability Management (IAVM) process. The application will be configured to check for and install security-relevant software updates within an identified time period from the availability of the update. The specific time period will be defined by an authoritative source (e.g., IAVM, CTOs, DTMs, and STIGs).
Checks: C-69809r999872_chk

Excel 2013 is no longer supported by the vendor. If the system is running Excel 2013, this is a finding.

Fix: F-69713r999873_fix

Upgrade to a supported version.