Manage Vulnerability Exceptions and Global Lists

Sysdig Secure allows users to put specific CVEs on Global Exception lists. Common reasons to exempt a vulnerability from consideration while scanning an image include, for example:

  • Knowing that the vuln does not apply to your runtime or cannot be exploited

  • Knowing that the suggested “fix version” will break a chain of dependencies, and you plan to evaluate how to patch this vulnerability in more detail

  • Knowing that there is no available fix for the vulnerability yet and you absolutely must deploy this application in production. (You decide to use a temporary alternate security strategy to protect from the vulnerability.)

When devising exception lists, you can detail what exceptions you introduce, for which images, and for how long, establishing a vulnerability exception management workflow.

Additionally, specific images can be marked as untrusted or globally trusted to ensure they always/never pass a scan.

scan_lists.png

Tip

Previous versions of Sysdig Secure called this feature Whitelist and Blacklist, and the options were located under the Scanning Policies tab.

Note that "blacklist" options for other entities, such as users, ports, packages, etc., are listed in Scanning Policy Gates and Triggers.

Create Multiple Exception Lists

By default, a single list is provided. Its name, Default exceptions list, can be retitled or removed if desired.

To create additional lists:

  1. Select Image Scanning > Vulnerability Exceptions and click the Add button on the left side of the screen.

    vuln_list.png
  2. Enter a Name and Description and click Save.

    Hover over the info bubble on an existing list to see its name, description, and last-modified date.

  3. For an exception list to be applied to an image during a scan, you must set up a scanning policy assignment to map the image to the list.

Note

If you delete or rename an exception list, the modification will be also applied to the policy assignments that contain that list.

Add a Vulnerability to a List

There are two ways to add a vulnerability to a list: from the Exceptions List page, or from the Scan Results.

From the Exceptions List Page

  1. SelectImage Scanning > Vulnerability Exceptions and choose the desired list from the left menu. (In this example, the Exception list is named "Python exceptions".)

  2. Click the Add button on the right side of the screen.

  3. Enter the identifying details:

    vuln_add.png
    • VULN ID: Required

    • Expiration Date: Required, but can be 'never'

    • Note Optional.

From the Scan Results

The scan results for an image may flag vulnerabilities you don't consider necessary. From the results list, you can quickly append those entries to exception lists as follows:

  1. Select Image Scanning > Scan Results.

  2. Select the Vulnerability type from the left menu and review the resulting list of flagged vulnerabilities.

    Note: The Exceptions column displays the number of lists already containing this vulnerability.

    scan_list.png
  3. Click the hover button to open the "Add Exception" dialog .

    vuln_add2.png
  4. Enter the details and click Save.

    • List: Sysdig will indicate with a “radar” icon the lists that are being applied to this image according to the policy assignments which are relevant for the evaluation of this particular image

      You can also enter additional list names in the field to create a new list.

    • Expiration Date: Required, but can be 'never'

    • Note Optional.

Manage Vulnerabilities in a List

An exception list can contain any number of vulnerabilities. Each vulnerability listing displays additional properties to help the security team understand the context, feed sources, and the justification and time span for the vulnerability to be on the list.

Fields in the List View

Select Image Scanning > Vulnerability Exceptions and choose a list from the left menu to review the vulnerability list details.

vuln_except2.png

Review the column data:

  • Enabled: On/off toggle for whether the exception for this vulnerability is active. If the vulnerability exception is disabled, it will not disappear from the list but will not be taken into account when evaluating an image. Rows that have met their expiration date are automatically disabled.

  • Name: String entered by the user to identify the vulnerability. For example, CVE-2019-9639 or VULNDB-213986.

  • Description: Vulnerability description, provided by Sysdig once the Vuln ID is provided by the user.

  • Notes: User-defined exception notes. Could be used to justify the decision or to append any additional links or information.

  • Expiration date: Day configured by the user for this exception to expire.

    • Default is never, for a vulnerability that should not expire. If an expiration is set, then day is the minimum time resolution.

    • All expiration dates are evaluated against 0:00 UTC timezone

Access and Edit Additional Details

Click on an exception row to see additional details about the vulnerability and to edit its properties.

vuln_details.png

You can:

  • View the full description

  • View and modify user notes

  • View and modify Expiration date

    Disabled exceptions cannot be re-enabled until a future date is set.

  • View segmented feed information, for every feed that is reporting this vulnerability:

    • Severity of the vulnerability as reported per each individual feed (color-coded)

    • Link to vulnerability details as provided per feed

Add Images to a Global List

There are two ways to add images to a Global Trusted or Untrusted list: from the list or from a scan result.

From the Global list:

  1. From the Image Scanning module, select either Global - Trusted Images or Global - Untrusted Images.

    The list of previously added images is displayed.

  2. Click the Add Image button.

  3. Add each image in a comma-separated list, then click Ok.

    A tag name must be valid ASCII and may contain lowercase and uppercase letters, digits, underscores, periods and dashes.

    A tag name may not start with a period or a dash and may contain a maximum of 128 characters.

From the Scan Results:

  1. From the Image Scanning module, choose the Scan Results tab.

  2. Select the relevant repository from the list and open the relevant image.

  3. Click Add to List at the top of the page.

    374670761.png
  4. Select either Add Image to Trusted Images or Add Image to Untrusted Images as needed.