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Introduction

Mend Bolt is a GitHub app, scanning your GitHub.com repositories at no cost (GitHub Enterprise Server is not supported). The app can be installed from the GitHub marketplace.  

It is an integrated product within GitHub that detects all open source components in your repository and alerts on vulnerabilities for these components, without ever scanning your code.
It provides you with issues on vulnerable open source components and generates comprehensive up-to-date reports on the GitHub 'Issues' tab of the scanned repository.

For more information or questions on Mend Bolt for GitHub, please reach out directly to boltgithub@Mendsoftware.com.

Prerequisites

Do the following:

For each repository that requires a Bolt scan, the Issues tab must be enabled for each repository. Do as follows:

1. Go to the relevant GitHub repository, and click Settings.

2. Verify that the Issues checkbox is enabled. 

3. Verify that the Issues tab appears next to the Code tab.

4. Ensure that you have administrator permissions to your GitHub account and to the relevant repositories (owner credentials) in order to install and use Mend Bolt for GitHub.

Installing Mend Bolt

1. Click the following link. The Mend Bolt for GitHub page is displayed.

2. Click Install. Note that if you have more than one GitHub account then you should initially confirm your installation location by selecting the GitHub account(s) for which you would like to install the Mend Bolt for GitHub app. Click the relevant account, and continue.

3. Select one of the following options:

   • All Repositories (Default): An option to scan all the repositories of the account.

   • Only select repositories: Select specific repositories that you would like to scan.

4. Read the permissions that must be provided for the Mend Bolt for GitHub app to work, and then click Install.

Registering Mend Bolt

After the installation, the Mend Bolt for GitHub Registration form appears with your email address filled in:

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This

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page

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After selecting your repositories, an onboarding pull request is created. This pull request contains a Mend configuration file (.Mend) that can be customized before merging the pull request. Once the pull request is merged, a Mend scan will be initiated.

At this stage, Bolt has started scanning your selected repositories. If a vulnerability is detected, then you will receive an email, and an issue will be created in your GitHub's project 'Issues' tab. The scanning process may take a number of minutes.

The '.Mend' File

A Mend configuration file ('.Mend') is added to each repository that is enabled for a scan. It provides configurable parameters for the Mend scan. The '.Mend' file is only added in the default branch of the repository (unless modified, it is the master branch). Any configuration change that is done to this file must be in the default branch of the repository. 

.Mend file

{
  "checkRunSettings": {
    "vulnerableCheckRunConclusionLevel": "failure"
  },
  "issueSettings": {
    "minSeverityLevel": "LOW"
  }
}

Parameters

vulnerableCheckRunConclusionLevel

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Parameter 

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Type

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Description

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Required 

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Default

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vulnerable.check.run.conclusion.level

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String

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The app utilizes the GitHub Checks API that provides checks in commits and pull requests on any repository branch. This parameter defines the conclusion status for when a Mend Security Check is completed. 

When the parameter is set to 'success', the conclusion status of a Mend Security Check will always be 'Success', even if the check fails. This way, any repository member is able to merge a pull request, even if a Mend Security Check found security vulnerabilities.

When the parameter is set to 'failure' (default), the conclusion status of a Mend Security Check will be 'Failure' in cases where Mend Security Check found security vulnerabilities or an error occurred during the scan. When this configuration is defined, and a branch protection rule has been added, a policy for approving a pull request is enforced. In this setting, only the administrator of the repository can approve the merging of a pull request that contains one or more checks with a 'Failure' status.

See also Initiating a Merge Policy.

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No

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failure

minSeverityLevel

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Parameter 

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Type

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Description

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Required 

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Default

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minSeverityLevel

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String

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available

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Available values for "minSeverityLevel" needs to be:

• NONE - No GitHub Issues will be generated.

• LOW - Any Low/Medium/High vulnerabilities found will generate a GitHub Issue.

• MEDIUM - Any Medium/High vulnerabilities found will generate a GitHub Issue.

• HIGH - Any High vulnerabilities found will generate a GitHub Issue.

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No

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LOW

Initiating a Scan

A Mend scan is initiated via a valid GitHub push command. A valid push command meets at least one of the following requirements:

• One of the commits in the push command added/removed a source file that has an extension supported by Mend.
  Refer to the Mend Languages page in order to find out whether or not a specific language and its extensions are supported. 

• One of the commits in the push command includes an addition/modification of the package manager dependency files.
  Refer to the list of supported dependency files to find out whether your dependency files are supported.

Viewing Details of the Scan

Results are viewed on the Issues tab of the repository on GitHub and via email notifications.

Viewing the Issues Tab

If you are making 'push' commands via the Web browser then click the Refresh button of the Web browser in order to view the issues that were found. 

The Issues tab displays all the issues that Mend Bolt for GitHub detected with the red security vulnerability label. This proprietary label indicates a security vulnerability was detected by Mend. 

As part of your workflow, you have the option to add multiple relevant labels to specific issues, and close issues that were resolved.

Viewing Details of an Issue

Clicking on a specific issue displays its details:

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Click on an item's list bullet (Image Removed) to view more information.

The display changes according to the type of library:

• Component-based library (e.g., '*.tgz', '*.jar' ): The vulnerable library appears first after the heading that indicates the name of the issue.
  It includes the following information:

  • Vulnerable library: Includes the path of the library. If the path is of a transitive dependency library then only the path information of the root library is relevant to you.

  • Commit link: Includes the path to the GitHub commit link where the vulnerability was found.

  • Vulnerability details: Description of vulnerability, published date, and link to the specific CVE in the CVE website.

  • CVSS 3 score: Basic CVSS3 score matrix. If this score is not available then the CVSS 2 score matrix is displayed.

  • Suggested fix for the vulnerability: A detailed suggestion that includes type, origin, release date, and fix resolution. Note that a fix may not always be available.

• Source file-based component: The vulnerable library appears as the first item in the list:
  It includes the following information:

  • Vulnerable library: Includes a comment that indicates the possibility of a false origin recognition, and a list of all the source files of this library. 

  • Vulnerability Details: Description of vulnerability, published date, and link to the specific CVE in the CVE website.

  • CVSS 3 score: Basic CVSS 3 score matrix. If this score is not available then the CVSS 2 score matrix is displayed.

  • Suggested fix for the vulnerability: A detailed suggestion that includes type, origin, release date, and fix resolution. Note that a fix may not always be available.

  • Commit link: Includes the path to the GitHub commit link where the vulnerability was found.
    

Email Notifications

After the scan is made, a separate email message is sent on each issue.

The information in the email message is identical to the displayed information on the Issues tab.

Initiating a Merge Policy

A merge policy utilizes the app's integration with GitHub Checks API. It enables the repository's administrator to approve the merging of a pull request with 'Failed' commit statuses to a target branch in the repository. 
For more information on Checks API, see the related GitHub Checks API introduction page.

Prerequisite for the Merge Policy: Add a Branch Protection Rule

In order to enable a merge policy based on the conclusion of a Mend Security Check, you must initially add the following GitHub rule for branch protection. Do as follows:

1. Go to the repository Settings > Branches. The Branches screen is displayed.

2. In the Branch protection rules area, click Add Rule.

3. Apply the rule to a specific branch or enter '*' to apply the rule to all branches:

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4. Select the following checkboxes:

   • Require status checks to pass before merging

   • Mend Security Check -  If you cannot view this setting, then modify the '.Mend' file, and perform a commit. Wait for the scan to complete and then refresh the GitHub settings page until you can view this setting.

Checks API Indicators

Checks API indicators are displayed for each head commit on the 'Commits' section of the 'Code' tab.

To view Mend information, click any of the following:

• Clicking on a specific indicator opens a pop-up window that displays further details on the status.

• Clicking on the 'Details' link in the pop up window displays the Mend Security Check page for the selected head commit. The page includes the conclusion status of the head commit along with a Security Report.

The security report displays all the vulnerabilities that were found in descending order according to the severity and CVSS score. The following information is displayed for each vulnerability:

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Severity: Overall score of the severity (High, Medium or Low).

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CVSS Score 

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CVE: A link to the related CVE page for the vulnerability.

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Types of Indicators

The following Checks API status indicators are available as a feedback on the head commits:

• Queued: Scan has not begun and is scheduled to begin.

• In progress: Scan is in progress.

• Completed: Scan completed with one of the following conclusions:

  • Success: When the parameter 'vulnerable.check.run.conclusion.level' is set to 'success', the status of the head commit is always success  A 'Success' status is displayed for the commit even when it fails.

  • Failure: Default for all completed scans. When the parameter 'vulnerable.check.run.conclusion.level' is set to 'failure' (default), the status of a 'failed' head commit is 'failure', and a policy for approving merging pull requests that include failed head commits with the another branch in the repository is enforced. Note that a 'failed' status can be caused due to security vulnerabilities or due to an error that occurred during the scan.

  • Neutral: conclusion occurs when the repository has reached its daily limit of scans, and the next scan will be on the next day or when the push command was not valid.

Samples of All Checks API status Indicators 

Queued

The following is a sample of a 'Queued' status, which indicates that the security check is about to start scanning the head commit's vulnerabilities.

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In Progress

The following is a sample of an 'In-Progress' status, which indicates that the security check is currently scanning the head commit.

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Completed with 'Success' Conclusion

The status can be displayed in two scenarios:

When the parameter 'vulnerable.check.run.conclusion.level' is set to 'success' or 'failure' (default), and a 'success' status is provided for the scan, since no vulnerabilities were found and no errors occurred during the scan for this head commit. In this case, the merging of a pull request that includes this commit to another branch in the repository is automatically approved. 

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When the parameter 'vulnerable.check.run.conclusion.level' is set to 'success'. In this configuration, even a 'failed' status for a head commit's scan is converted to 'success'. The following screenshot displays a 'success' indicator for a commit that includes high severity vulnerabilities, since the parameter 'vulnerable.check.run.conclusion.level' is set to 'success'. In this case, the merging of a pull request that includes this head commit to another branch in the repository is automatically approved. 

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Completed with 'Failure' Conclusion

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The following screenshot is a sample of the display in a pull request page when a 'failure' policy is enforced and one or more of its head commits have a 'failure' status. Only the administrator of the repository can approve the merging of a pull request with a 'failure' status:

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Completed with 'Neutral' Conclusion

A neutral conclusion occurs in one of the following scenarios:

• The repository has reached its daily limit of scans, and the next security check will only run on push commands that are done on the following day:

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• The push command was not valid. See the Initiating a Scan section for more information on valid commands.
  

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Uninstalling Mend Bolt

Uninstalling Mend Bolt for GitHub removes it from all your repositories.

To uninstall Mend Bolt, do as follows:

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In your GitHub's account (personal) settings, click Applications. The Applications screen is displayed.

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Ensure Installed GitHub Apps is the active tab.

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Next to Mend Bolt for GitHub, click Configure.

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The Mend Bolt for GitHub page is displayed.

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In the Uninstall Mend Bolt for GitHub area, click Uninstall.

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at Mend’s new Knowledge Hub, here: Mend Bolt for GitHub