Number: AL22-007
Date: 31 May 2022

Audience

This Alert is intended for IT professionals and managers of notified organizations.

Purpose

An Alert is used to raise awareness of a recently identified cyber threat that may impact cyber information assets, and to provide additional detection and mitigation advice to recipients. The Canadian Centre for Cyber Security (“Cyber Centre”) is also available to provide additional assistance regarding the content of this Alert to recipients as requested.

Overview

On 30 May 2022 Microsoft published guidance for a vulnerability, dubbed “Follina”, impacting the Microsoft Support Diagnostic Tool (MSDT) with active exploitation recently reported due to the release of proofs of concept.

Details

On 30 May 2022 Microsoft published guidance for a vulnerability impacting the Microsoft Support Diagnostic Tool (MSDT). Footnote 1 This vulnerability is also known as “Follina” and has been designated CVE-2022-30190.

Exploitation of CVE-2022-30190, with a Common Vulnerability Scoring System (CVSS) score of 7.8, may result in the execution of arbitrary code. Several technical reviews of this vulnerability have been published in open source Footnote 2Footnote 3, along with several proofs of concept.

Open-source reporting has indicated that active exploitation of this vulnerability has been observed in the wild. Footnote 4

Recommended actions

Although a patch for this vulnerability is not yet provided, the Cyber Centre recommends organizations follow the mitigations provided by Microsoft and open source where possible, which include:

  • Disabling the MSDT URL Protocol, which inhibits the ability for MSDT to launch. Footnote 1
  • If using Microsoft Defender for Endpoint, block Office applications from creating child processes. Footnote 3 Footnote 5
  • Disabling Troubleshooting Wizards via the EnableDiagnostics registry value until a patch is available. Footnote 5

In addition, the Cyber Centre recommends organizations review the Cyber Centre’s advice on recognizing phishing techniques and educate users on the dangers of phishing. Footnote 6 Users should never open any emails from unexpected contacts or with unexpected content.

The Cyber Centre has not verified all the technical recommendations described in this disclosure and is providing this information as is for awareness. Before applying any of the above recommended actions it is important that organizations check with vendors, application developers and systems administrators to ensure business services and network environments continuity are assured prior to implementing any enterprise level changes.

Should activity matching the content of this Alert be discovered, recipients are encouraged to report via the My Cyber Portal, contact the Cyber Centre by email ([email protected]), or by telephone (1-833-CYBER-88 or 1-833-292-3788).



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