CVE-2021-42306 Azure Active Directory Information Disclosure Vulnerability
Attackers with application read access can view private keys uploaded to Azure AD applications, exposing sensitive authentication credentials.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-42306?
CVE-2021-42306 is a high-severity vulnerability in Microsoft Azure Active Directory, published on 24 Nov 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-522
Which versions are affected by CVE-2021-42306?
It affects 4 products.
Products include Microsoft Azure Active Directory, Microsoft Azure Active Site Recovery, Microsoft Azure Automation, Microsoft Azure Migrate.
How do I fix CVE-2021-42306?
No fix has been published for CVE-2021-42306 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-42306 being exploited?
There is no known exploitation of CVE-2021-42306 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Azure Active Directory
Sources
Also known as GHSA-vxjx-p5m9-q5fr.