The Patching Friars' AlmanacA calendar of CVE saints

November 17

CredManifestHoly card for credmanifest, generated with AI (Claude, Anthropic) for the Lunario dei Frati Patchatori.CC BY-NC-SA 4.0 priv CredManifest CLAVIS MANIFESTA
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Saint CredManifest, Who Published the Private Keys

Patron of Azure AD applications, certificates uploaded carelessly, and private keys that should never have left.

Life

On 17 November 2021 NetSPI described CredManifest: when a certificate was uploaded to an Azure Active Directory application or service principal, in certain cases the private key too ended up recorded among the object's readable attributes. Anyone in the tenant with read access to applications could thus retrieve it and impersonate the identity. Microsoft fixed it by preventing disclosure of private keys added to applications (CVE-2021-42306).

Prayer

O Saint CredManifest, who exposes the private key along with the certificate, let our secrets stay on the right side of the wall. Amen.

How to celebrate

Celebrated by rotating the suspect certificates and checking that no private key is readable in the applications' attributes.

Upload the key with the certificate and you gift it to the whole tenant.

Technical record

Disclosed on
November 17 2021
CVE
CVE-2021-42306
CVSS
8.1
Product
Microsoft · Azure Active Directory

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.

Sources: netspi.com

Canonized by Pope Log4Shell I

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Same year: 2021

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