Configuration Settings

The configuration menu includes the following settings:

Data expiration determines how long Tenable Security Center retains closed tickets, scan results, and report results.

Option

Description
User Generated Object Lifetime

Closed Tickets

The number of days you want Tenable Security Center to retain closed tickets. The default value of this option is 365 days.

Scan Results

The number of days you want Tenable Security Center to retain scan results. The default value of this option is 365 days.

Report Results

The number of days you want Tenable Security Center to retain report results. The default value of this option is 365 days.

Tip: You can configure vulnerability data expiration for individual IPv4, IPv6, and agent repositories. For more information, see IPv4/IPv6 Repositoriesand Agent Repositories.

The Tenable Security Center external schedule settings determine the update schedule for the common tasks of pulling Tenable Nessus Network Monitor data, IDS signature updates, and IDS correlation updates.

Option

Description
Tenable Nessus Network Monitor

Pull Interval

This option configures the interval that Tenable Security Center uses to pull results from the attached Tenable Nessus Network Monitor instances. The default setting is 1 hour. The timing is based from the start of the Tenable Security Center service on the host system.
Tenable Log Correlation Engine

IDS Signatures

Specifies the frequency to update Tenable Security Center IDS signatures via third-party sources. The schedule appears along with the specified time zone.

IDS Correlation Databases

Specifies the frequency to push vulnerability information to the Log Correlation Engine for correlation. The schedule appears along with the specified time zone.

You can also configure each of the update schedule times to occur by time in a particular time zone using the Time Zone link next to each hour selection.

The Mail option designates SMTP settings for all email-related Tenable Security Center functions. Available options include SMTP host, port, authentication method, encryption, and return address. In addition, you can use the Test SMTP Settings in the upper left corner of the page to validate the settings.

Note: Type the Username in a format supported by your SMTP server (for example, [email protected] or domain\username).

Note: The Return Address defaults to noreply@localhost. Use a valid return email address for this option. If this option is empty or the email server requires emails from valid accounts, the email server cannot send the email.

The Miscellaneous Configuration section offers options to configure settings for web proxy, syslog, notifications, and enable or disable some report types.

Web Proxy

From this configuration page, you can configure a web proxy by entering the host URL (proxy hostname or IP address), port, authentication type, username, and password. The hostname used must resolve properly from the Tenable Security Center host.

Syslog

In the Syslog section, you can configure options to allow Tenable Security Center to send administrative log events to the local syslog service. For more information about the types of Tenable Security Center logs, see the knowledge base article.

Option

Description
Enable Forwarding Enables log forwarding options.
Facility Type the facility you want to receive the log messages.
Severity Specifies which syslog message levels you want to forward: Informational, Warning, or Critical.

Scanning

The IP Randomization option specifies how you want Tenable Security Center to send active scan target lists to Tenable Nessus and Tenable Vulnerability Management scanners.

You enable or disable IP randomization for all configured active scans; you cannot configure IP randomization on a per-scan basis.

  • When enabled, Tenable Security Center randomizes the targets in the active scan before sending the target list to the scanners to reduce strain on network devices during large active scans.

    Scan Randomization
    1,000 or fewer targets

    Tenable Security Center randomizes all the IP addresses in the target list.
    1,001 or more targets

    Tenable Security Center randomizes all the IP addresses in the target list by:

    1. Ordering the IP addresses numerically and splitting them into 100 groups.
    2. Randomly selecting a group and choosing the lowest IP address from that group.
    3. Selecting groups and IP addresses until all IP addresses in all groups are randomized in the target list.

    If the active scan includes a Tenable Vulnerability Management scanner, Tenable Security Center breaks the target list into smaller lists (256 IP addresses each) before sending to Tenable Vulnerability Management.

    Note: Some randomized target lists (such as small target lists) may still contain sequences of increasing IP addresses. This is a possible outcome of randomization, not an indication that randomization failed.

  • When disabled, Tenable Security Center organizes the target list by increasing IP address. Then, scanners scan targets, starting with the lowest IP address and finishing with the highest IP address.

Tip: The Max simultaneous hosts per scan scan policy option specifies how many IP addresses Tenable Security Center sends to each scanner at a time. For more information, see Scan Policy Options.

Notifications

The Notifications section defines the Tenable Security Center web address used when alerts and tickets generate notifications.

Report Generation

If your organization requires specialized reporting formats, such as DISA or CyberScope, you can enable Report Generation options based on your organization's needs.

  • Defense Information Systems Agency (DISA) reporting standards include the Assessment Summary Results (ASR), Assessment Results Format (ARF), and Consolidated Assessment Results Format (CARF) styles.

  • CyberScope reports utilize Lightweight Asset Summary Results Schema (LASR) style reports, which are used by some segments of governments and industry.

To allow users to choose these reports during report creation, you must enable the corresponding toggles. For more information about reports in Tenable Security Center, see Reports.

Option

Description
Enable DISA ARF Enable the DISA ARF report format, which meets the standards of the Defense Information Systems Agency Assessment Results Format.
Enable DISA Consolidated ARF Enable the DISA consolidated ARF report format, which meets the standards of the Defense Information Systems Agency Consolidated Assessment Results Format.
Enable DISA ASR Enable the DISA ASR report format, which meets the standards of the Defense Information Systems Agency Assessment Summary Results.
Enable CyberScope Enable the CyberScope report format, which meets CyberScope reporting standards to support FISMA compliance.

Risk Rule Comments

You can enable the Recast and Accept Risk Rule Comments option to display accept risk rule comments and recast risk rule comments in reports and vulnerability analysis views.

For more information about recast risk rules and accept risk rules, see Recast Risk Rules and Accept Risk Rules.

For more information about vulnerability analysis views, see View Vulnerability Instance Details and View Vulnerabilities by Plugin.

Privacy

The Enable Usage Statistics option specifies whether Tenable collects anonymous telemetry data about your Tenable Security Center deployment.

When enabled, Tenable collects usage statistics that cannot be attributed to a specific user or customer. Tenable does not collect personal data or personally identifying information (PII).

Usage statistics include, but are not limited to, data about your visited pages, your used reports and dashboards, your Tenable Security Center license, and your configured features. Tenable uses the data to improve your user experience in future Tenable Security Center releases. You can disable this option at any time to stop sharing usage statistics with Tenable.

After you enable or disable this option, all Tenable Security Center users must refresh their browser window for the changes to take effect.

Performance Optimization

You can enable the Disk Writes option to reduce the number of times Tenable Security Center writes to disk while performing certain functions, such as importing scan results, passive data, and Log Correlation Engine data. Enabling this option can improve performance and increase the potential disk lifetime for the host where Tenable Security Center stores its repository data (typically, the /opt/sc/repositories folder).

For more information about importing scan policies, see Import a Scan Policy.

The License Configuration section allows you to configure licensing and activation code settings for Tenable Security Center and all attached Tenable products.

For information about the Tenable Security Center license count, see License Requirements. To add or update a license, see Apply a New License or Update an Existing License.

The Plugins/Feed Configuration page displays the Plugin Detail Locale for Tenable Security Center and the feed and plugin update (scanner update) schedules.

For more information, see Edit Plugin and Feed Settings and Schedules.

Update

Description

Tenable Security Center Feed

Retrieves the latest Tenable Security Center feed from Tenable. This feed includes data for general use, including templates (for example, dashboards, ARCs, reports, policies, assets, and audit files), template-required objects, some general plugin information, and updated VPR values.
Active Plugins

Retrieves the latest active plugins feed (for Tenable Nessus and Tenable Vulnerability Management scanners) from Tenable. Tenable Security Center pushes the feed to Tenable Nessus and Tenable Vulnerability Management scanners.
Passive Plugins

Retrieves the latest passive plugins feed from Tenable. Tenable Security Center pushes the feed to Tenable Nessus Network Monitor instances.
Event Plugins

Retrieves the latest event plugins feed from Tenable. Tenable Security Center uses the feed locally with Log Correlation Engine data but does not push the feed to Log Correlation Engine; Log Correlation Engine retrieves the feed directly from Tenable.

For information about Tenable Security Center-Tenable plugins server communications encryption, see Encryption Strength.

Plugin Detail Locale

The local language plugin feature allows you to display portions of plugin data in local languages. When available, translated text displays on all pages where plugin details appear.

Select Default to display plugin data in English.

Note: Tenable Security Center cannot translate text within custom files. Upload a translated Active Plugins.xml file to display the file content in a local language.

For more information, see Configure Plugin Text Translation.

Schedules

Tenable Security Center automatically updates Tenable Security Center feeds, active plugins, passive plugins, and event plugins. If you upload a custom feed or plugin file, the system merges the custom file data with the data contained in the associated automatically updating feed or plugin.

You can upload tar.gz files with a maximum size of 1500 MB.

For more information, see Edit Plugin and Feed Settings and Schedules.

Use the SAML section to configure SAML 2.0-based SAML authentication (for example, Okta, OneLogin, Shibboleth 2.0, etc.) for Tenable Security Center users. For more information, see SAML Authentication.

Use the Security section to define the Tenable Security Center user interface login parameters and options for account logins. You can also configure banners, headers, and classification headers and footers.

Option

Description
Authentication Settings

Session Timeout

The web session timeout in minutes (default: 60).

Maximum Login Attempts

The maximum number of user login attempts Tenable Security Center allows before locking out the account (default: 20). To disable this feature, set the value to 0.

Minimum Password Length

This setting defines the minimum number of characters for passwords of accounts created using the local TNS authentication access (default: 3).
Password Complexity

When enabled, user passwords must be at least 4 characters long and contain at least one of each of the following:

  • An uppercase letter
  • A lowercase letter
  • A numerical character
  • A special character

Note: After you enable Password Complexity, Tenable Security Center prompts all users to reset their passwords the next time they log in to Tenable Security Center.

Note: If you enable Password Complexity and set the Minimum Password Length to a value greater than 4, Tenable Security Center enforces the longer password requirement.

Startup Banner Text

Type the text banner that appears before to the login interface.

Header Text

Adds custom text to the top of the Tenable Security Center user interface pages. You can use the text to identify a company, group, or other organizational information (maximum 128 characters).

Classification Type

Adds a header and footer banner to Tenable Security Center to indicate the classification of the data accessible via the software. Current options are None, Unclassified, Confidential, Secret, Top Secret, and Top Secret – No Foreign.

Sample header:

Sample footer:

Note: If you set Classification Type to an option other than None, users can only see the plain report styles. The Tenable report styles do not support the classification banners.
Allow API Keys When enabled, allows users to generate API keys as an authentication method for Tenable Security Center API requests. For more information, see Enable API Key Authentication.
Allow Session Management This setting is disabled by default. When enabled, the Session Limit option appears. This feature displays the option that allows administrators to set a session limit for all users.
Disable Inactive Users

When enabled, Tenable Security Center disables user accounts after a set period of inactivity. You cannot use a disabled user account to log in to Tenable Security Center, but other users can use and manage objects owned by the disabled user account.
Days Users Remain Enabled When you enable Disable Inactive Users, specify the number of inactive days you want to allow before automatically disabling a user account.
Session Limit

Specifies the maximum number of sessions a user can have open at once.

If you log in and the session limit has already been reached, Tenable Security Center notifies you that the oldest session with that username will be logged out automatically. You can cancel the login or proceed with the login and end the oldest session.

Note: This behavior is different for Common Access Cards (CAC) logins. Tenable Security Center does not check active sessions for CAC authentication.
Login Notifications Sends notifications for each time a user logs in.
WebSeal

Allows you to enable or disable WebSEAL. WebSEAL supports multiple authentication methods, provides Security Access Authorization service, and single sign-on capabilities.

Caution: Before the user that enabled WebSEAL logs out of Tenable Security Center, Tenable Security Center strongly recommends confirming, in a separate session, that at least one user (preferably an administrator user) is able to log in successfully via WebSEAL. Otherwise, if there is an issue, no one will be able to access Tenable Security Center to turn off WebSEAL.

Caution: Any user created while WebSEAL is enabled will not have a password. An administrator must update the user account to establish a password. Any user that existed before enabling WebSEAL must revert to their old password.
PHP Serialization

Operational Status

Summarizes your current setting.

PHP Serialization Mode

Specifies whether you want to allow or prevent PHP serialization in Tenable Security Center.

  • PHP Serialization ON — Tenable Security Center performs PHP serialization and Tenable Security Center features operate as expected.

  • PHP Serialization OFF — Tenable Security Center does not perform PHP serialization and prevents users from importing or exporting the following objects:

    • Assets

    • Scan policies

    • Assurance Report Cards

    • Reports

    • Audit files

    • Dashboards

Scanners

Picture in Picture

When enabled, allows administrators to view and manage Tenable Nessus scanner configurations from the Tenable Security Center user interface. For more information, see Enable Picture in Picture.

Note: You cannot use Picture in Picture with a Tenable Nessus scanner if you enabled Use Proxy for the scanner or if the scanner's Authentication Type is SSL Certificate. For more information, see Tenable Nessus Scanner Settings.

If you have a Tenable Vulnerability Management license to use Tenable Lumin with Tenable Security Center, you can configure your Tenable Security Center data to synchronize to Tenable Vulnerability Management for Tenable Lumin analysis.

For more information, see Tenable Lumin Synchronization.