Microsoft Azure Defender for IoT Improper Certificate Validation Authentication Bypass Vulnerability

December 21st, 2021
ZDI-21-1553 ZDI-CAN-14728

CVE ID

CVE-2021-43882

CVSS Score

9.8 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors

Microsoft

Affected Products

Azure Defender for IoT

Vulnerability Details

This vulnerability allows remote attackers to bypass authentication on affected installations of Microsoft Azure Defender for IoT console and sensor appliances. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the password reset mechanism. The issue results from the lack of proper validation of a certificate chain. An attacker can leverage this vulnerability to bypass authentication on the system.

Additional Details

Microsoft has issued an update to correct this vulnerability. More details can be found at:
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-43882

Disclosure Timeline

  • 2021-10-08 - Vulnerability reported to vendor
  • 2021-12-21 - Coordinated public release of advisory

Credit

Anonymous

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