CVE-2021-42306 Explained : Impact and Mitigation
Discover the information disclosure vulnerability in Azure Active Directory with CVE-2021-42306. Learn the impact, affected systems, exploitation mechanism, and mitigation steps.
This CVE-2021-42306 article provides details about an information disclosure vulnerability in Azure Active Directory.
Understanding CVE-2021-42306
What is CVE-2021-42306?
An information disclosure vulnerability in Azure Active Directory occurs when private key data is uploaded as part of an authentication certificate, enabling unauthorized access to the data.
The Impact of CVE-2021-42306
This vulnerability allows users or services with application read access to view private key data uploaded to the Azure AD application or Service Principal.
Technical Details of CVE-2021-42306
Vulnerability Description
- Uploading unprotected private key data can lead to information disclosure.
- Azure AD has addressed this by preventing disclosure of private key values.
Affected Systems and Versions
- Affected systems include Azure Automation, Azure Active Directory, Azure Site Recovery, and Azure Migrate.
- Versions such as Azure Automation 1.0.0 are affected.
Exploitation Mechanism
- Users or services with application read access can exploit the vulnerability to access private key data.
Mitigation and Prevention
Immediate Steps to Take
- Avoid uploading unprotected private key data to Azure AD applications.
- Ensure application read access is restricted.
Long-Term Security Practices
- Regularly review and update access control policies.
- Monitor and audit access to sensitive data.
Patching and Updates
- Follow guidance from Microsoft to mitigate the vulnerability effectively.