CVE-2021-42306: Azure Active Directory Information Disclosure Vulnerability
First published: Wed Nov 24 2021(Updated: )
An information disclosure vulnerability manifests when a user or an application uploads unprotected private key data as part of an authentication certificate keyCredential on an Azure AD Application or Service Principal (which is not recommended). This vulnerability allows a user or service in the tenant with application read access to read the private key data that was added to the application. Azure AD addressed this vulnerability by preventing disclosure of any private key values added to the application. Microsoft has identified services that could manifest this vulnerability, and steps that customers should take to be protected. Refer to the FAQ section for more information. For more details on this issue, please refer to the MSRC Blog Entry.
Credit: secure@microsoft.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Microsoft Azure Active Directory | <2021-10-30 | |
| Microsoft Azure Site Recovery | <2021-11-01 | |
| Microsoft Azure Automation | <2021-10-15 | |
| Microsoft Azure Migrate | <2021-11-02 |
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Frequently Asked Questions
What is the severity of CVE-2021-42306?
CVE-2021-42306 is classified as an information disclosure vulnerability.
How do I fix CVE-2021-42306?
To fix CVE-2021-42306, ensure that private key data is not uploaded as part of authentication certificate keyCredentials.
What software is affected by CVE-2021-42306?
CVE-2021-42306 affects various versions of Microsoft Azure Active Directory, Azure Active Site Recovery, Azure Automation, and Azure Migrate.
What is the potential impact of CVE-2021-42306?
The potential impact of CVE-2021-42306 is that it allows unauthorized access to unprotected private key data.
How can I prevent CVE-2021-42306?
Preventing CVE-2021-42306 involves adhering to best practices by not uploading sensitive private key data in Azure authentication processes.
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