AlertsMicrosoft Azure Security Advisory

Number: AV21-424
Date: 27 August 2021

On 26 August 2021 security researchers disclosed a vulnerability in Microsoft’s Azure cloud platform. The following Azure component is affected:

  • Cosmos DB

Exploitation of this vulnerability would have exposed credentials that could have allowed an unauthorized actor to view, modify or delete data in Cosmos DB databases.

Microsoft has indicated in open-source reporting that it remediated the vulnerability on 14 August 2021. However, the researchers suggest that Azure Cosmos DB keys may have been exposed prior to this.

The Cyber Centre encourages users and administrators to review the provided web links, assess the risk of potential exposure and consider regenerating the Cosmos DB primary key.

ChaosDB - Critical Vulnerability in Microsoft Azure Cosmos DB

Secure access to data in Azure Cosmos DB

Note to Readers 

The Canadian Centre for Cyber Security (Cyber Centre) operates as part of the Communications Security Establishment.  We are Canada’s national authority on cyber security and we lead the government’s response to cyber security events. As Canada's national computer security incident response team, the Cyber Centre works in close collaboration with government departments, critical infrastructure, Canadian businesses and international partners to prepare for, respond to, mitigate, and recover from cyber events. We do this by providing authoritative advice and support, and coordinating information sharing and incident response. The Cyber Centre is outward-facing, welcoming partnerships that help build a stronger, more resilient cyber space in Canada.

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