⚠️ Region Alert: UAE/Middle East
Azure Private Link’s architecture contains a specific DNS resolution behavior that can inadvertently trigger denial-of-service (DoS) conditions for cloud resources. Unit 42 researchers discovered that when a Private DNS zone is linked to a virtual network, Azure prioritizes that zone for all matching service type resolutions. If a resource record is missing from the zone, connectivity fails, even if the public endpoint is reachable and unchanged.
This issue impacts over 5% of Azure storage accounts and common services like Key Vault, CosmosDB, and Azure OpenAI. Risks range from accidental internal misconfigurations to malicious exploitation by threat actors. To mitigate these risks, defenders are encouraged to enable DNS fallback to the public internet, manually add missing records, and use Azure Resource Graph queries to identify at-risk infrastructure.
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