CVE-2021-42306

moderate-risk
Published 2021-11-24

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.

Do I need to act?

~
8.5% chance of exploitation in next 30 days
EPSS score — moderate exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
8
CVSS 8.1/10 High
NETWORK / LOW complexity

Affected Products (4)

Azure Active Directory
Azure Active Site Recovery
Azure Automation
Azure Migrate

Affected Vendors

Microsoft

References (2)

Patch https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-4230...
Patch https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-4230...
48
/ 100
moderate-risk
Severity 28/34 · Critical
Exploitability 10/34 · Low
Exposure 10/34 · Low