Microsoft addresses a high-severity vulnerability in Azure AD

guest · Nov 19, 2021

Microsoft addresses a high-severity vulnerability in Azure AD
November 18, 2021
https://securityaffairs.co/wordpress/124755/security/microsoft-azure-ad-flaw.html

Microsoft has recently addressed an information disclosure vulnerability, tracked as CVE-2021-42306, affecting Azure AD.

“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.” reads the advisory published by Microsoft.
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The vulnerability was discovered by Karl Fosaaen from NetSPI, it received a CVSS score of 8.1. Fosaaen explained that due to a misconfiguration in Azure, Automation Account “Run as” credentials (PFX certificates) ended up being stored in clear text in Azure AD and anyone with access to information on App Registrations can access them.

An attacker can exploit this flaw to escalate privileges to Contributor of any subscription that has an Automation Account, then access resources in the affected subscriptions, including sensitive information stored in Azure services and credentials stored in key vaults.
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Microsoft addressed the flaw by preventing Azure services from storing clear text private keys in the keyCredentials property and by preventing users from reading any private key data that has been stored in clear text.
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Microsoft addresses a high-severity vulnerability in Azure AD

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Microsoft addresses a high-severity vulnerability in Azure AD

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