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Microsoft Outlook 2013 STIG

Rules, Groups, and Values defined within the XCCDF Benchmark

  • DTOO215 - Read signed EMail as plain text

    <GroupDescription></GroupDescription>
    Group
  • Read signed email as plain text must be enforced.

    &lt;VulnDiscussion&gt;Outlook can display email messages and other items in three formats: plain text, Rich Text Format (RTF), and HTML. By default...
    Rule Medium Severity
  • DTOO244 - Lvl 1 File extensions

    <GroupDescription></GroupDescription>
    Group
  • Level 1 file extensions must be blocked and not removed.

    &lt;VulnDiscussion&gt;Malicious code is often spread through e-mail. Some viruses have the ability to send copies of themselves to other people in ...
    Rule Medium Severity
  • DTOO245 - Lvl 2 File Extensions

    <GroupDescription></GroupDescription>
    Group
  • Level 2 file extensions must be blocked and not removed.

    &lt;VulnDiscussion&gt;Malicious code is often spread through email. Some viruses have the ability to send copies of themselves to other people in t...
    Rule Medium Severity
  • DTOO218 - Calendar details published by users

    <GroupDescription></GroupDescription>
    Group
  • Level of calendar details that a user can publish must be restricted.

    &lt;VulnDiscussion&gt;Outlook users can share their calendars with selected others by publishing them to the Microsoft Office Outlook Calendar Shar...
    Rule Medium Severity
  • DTOO220 - Upload methods

    <GroupDescription></GroupDescription>
    Group
  • Upload method for publishing calendars to Office Online must be restricted.

    &lt;VulnDiscussion&gt;When users publish their calendar to Microsoft Office Online using the Microsoft Office Outlook Calendar Sharing Service, Out...
    Rule Medium Severity
  • DTOO267 - Retrieving CRLs - Outlook

    <GroupDescription></GroupDescription>
    Group
  • Retrieving of CRL data must be set for online action.

    &lt;VulnDiscussion&gt;This policy setting controls how Outlook retrieves Certificate Revocation Lists to verify the validity of certificates. Cert...
    Rule Medium Severity
  • DTOO262 - FIPS compliant mode

    <GroupDescription></GroupDescription>
    Group
  • Run in FIPS compliant mode must be enforced.

    &lt;VulnDiscussion&gt;Outlook can run in a mode that complies with Federal Information Processing Standards (FIPS), a set of standards published by...
    Rule Medium Severity
  • DTOO257 - No S/Mime interop w/ external clients

    <GroupDescription></GroupDescription>
    Group
  • S/Mime interoperability with external clients for message handling must be configured.

    &lt;VulnDiscussion&gt;In some situations, administrators might wish to use an external program, such as an add-in, to handle S/MIME message decrypt...
    Rule Medium Severity
  • DTOO266 - S/Mime receipt requests

    <GroupDescription></GroupDescription>
    Group
  • Automatic sending s/Mime receipt requests must be disallowed.

    &lt;VulnDiscussion&gt;Incoming signed or encrypted messages might include S/MIME receipt requests. S/MIME receipts provide confirmation that messag...
    Rule Medium Severity
  • DTOO276 - Security settings for macros

    <GroupDescription></GroupDescription>
    Group
  • Always warn on untrusted macros must be enforced.

    &lt;VulnDiscussion&gt;To protect users from dangerous code, the Outlook default configuration disables all macros that are not trusted, including u...
    Rule Medium Severity
  • DTOO264 - Clear signed messages

    <GroupDescription></GroupDescription>
    Group
  • Send all signed messages as clear signed messages must be configured.

    &lt;VulnDiscussion&gt;When users sign email messages with their signing certificate and send them, Outlook uses the sender's private key to encrypt...
    Rule Medium Severity
  • DTOO247 - Custom OOM Action Exe. Prompt

    <GroupDescription></GroupDescription>
    Group
  • Custom Outlook Object Model (OOM) action execution prompts must be configured.

    &lt;VulnDiscussion&gt;Custom actions add functionality to Outlook that can be triggered as part of a rule. Among other possible features, custom ac...
    Rule Medium Severity
  • DTOO265 - Signature Warnings

    <GroupDescription></GroupDescription>
    Group
  • RSS feed synchronization with Common Feed List must be disallowed.

    &lt;VulnDiscussion&gt;The Common Feed list is a hierarchical set of RSS feeds to which clients such as Outlook 2013, the Feeds list in Internet Exp...
    Rule Medium Severity
  • DTOO223 - Trust EMail from Contacts

    <GroupDescription></GroupDescription>
    Group
  • Trust EMail from senders in receivers contact list must be enforced.

    &lt;VulnDiscussion&gt;Email addresses in users' Contacts list are treated as safe senders for purposes of filtering junk email. If this configurati...
    Rule Medium Severity
  • DTOO282 - RSS Feeds

    <GroupDescription></GroupDescription>
    Group
  • RSS Feeds must be disallowed.

    &lt;VulnDiscussion&gt;Users can subscribe to RSS feeds from within Outlook and read RSS items like email messages. If an organization has policies ...
    Rule Medium Severity
  • DTOO231 - Unicode use when dragging Email

    <GroupDescription></GroupDescription>
    Group
  • Dragging Unicode email messages to file system must be disallowed.

    &lt;VulnDiscussion&gt;When users drag email messages from Outlook to a Windows Explorer window or to their Desktop, Outlook creates an .msg file us...
    Rule Medium Severity
  • DTOO286 - Disable User Entries to Server list

    <GroupDescription></GroupDescription>
    Group
  • User Entries to Server List must be disallowed.

    &lt;VulnDiscussion&gt;If users are able to manually enter the addresses of servers that are not approved by the organization, they could use server...
    Rule Medium Severity
  • DTOO126 - Add-on Management

    <GroupDescription></GroupDescription>
    Group
  • Add-on Management functionality must be allowed.

    &lt;VulnDiscussion&gt;Internet Explorer add-ons are pieces of code, run in Internet Explorer, to provide additional functionality. Rogue add-ons ma...
    Rule Medium Severity
  • DTOO209 - Zone Elevation Protection

    <GroupDescription></GroupDescription>
    Group
  • Protection from zone elevation must be enforced.

    &lt;VulnDiscussion&gt;Internet Explorer places restrictions on each web page users can use the browser to open. Web pages on a user's local compute...
    Rule Medium Severity
  • DTOO211 - Restrict ActiveX Install

    <GroupDescription></GroupDescription>
    Group
  • ActiveX installs must be configured for proper restrictions.

    &lt;VulnDiscussion&gt;Microsoft ActiveX controls allow unmanaged, unprotected code to run on the user computers. ActiveX controls do not run within...
    Rule Medium Severity
  • DTOO132 - Restrict File Download

    <GroupDescription></GroupDescription>
    Group
  • File Downloads must be configured for proper restrictions.

    &lt;VulnDiscussion&gt;Disabling this setting allows websites to present file download prompts via code without the user specifically initiating the...
    Rule Medium Severity
  • DTOO124 - Scripted Window Security

    <GroupDescription></GroupDescription>
    Group
  • Scripted Window Security must be enforced.

    &lt;VulnDiscussion&gt;Malicious websites often try to confuse or trick users into giving a site permission to perform an action allowing the site t...
    Rule Medium Severity
  • DTOO313 - Automatically download enclosures

    <GroupDescription></GroupDescription>
    Group
  • Outlook Rich Text options must be set for converting to plain text format.

    &lt;VulnDiscussion&gt;Outlook automatically converts RTF formatted messages that are sent over the Internet to HTML format, so that the message for...
    Rule Medium Severity
  • DTOO314 - Set message format

    <GroupDescription></GroupDescription>
    Group
  • Default message format must be set to use Plain Text.

    &lt;VulnDiscussion&gt;Outlook uses HTML as the default email format. HTML format poses a security risk by embedding information into the email itse...
    Rule Medium Severity
  • DTOO315 - Outlook Security settings

    <GroupDescription></GroupDescription>
    Group
  • Outlook must be configured not to prompt users to choose security settings if default settings fail.

    &lt;VulnDiscussion&gt;This policy prompts the user to choose security settings if default settings fail, but allowing users to select their own sec...
    Rule Medium Severity

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