Skip to main content
MSRC

Month Archives: September 2023

Microsoft mitigated exposure of internal information in a storage account due to overly-permissive SAS token

Monday, September 18, 2023

Summary Summary As part of a recent Coordinated Vulnerability Disclosure (CVD) report from Wiz.io, Microsoft investigated and remediated an incident involving a Microsoft employee who shared a URL for a blob store in a public GitHub repository while contributing to open-source AI learning models. This URL included an overly-permissive Shared Access Signature (SAS) token for an internal storage account.

Results of Major Technical Investigations for Storm-0558 Key Acquisition

Wednesday, September 06, 2023

On July 11, 2023, Microsoft published a blog post which details how the China-Based threat actor, Storm-0558, used an acquired Microsoft account (MSA) consumer key to forge tokens to access OWA and Outlook.com. Upon identifying that the threat actor had acquired the consumer key, Microsoft performed a comprehensive technical investigation into the acquisition of the Microsoft account consumer signing key, including how it was used to access enterprise email.