DNS Over DoS: Are Private Endpoints Too Private?
Summary: Unit 42 found that Azure's Private Endpoint architecture can expose resources to denial-of-service conditions when a Private DNS zone linked to one virtual network forces name resolution away from a public endpoint that still works, causing resolution to fail for workloads in other virtual networks. The research states that over 5% of Azure storage accounts currently run with configurations subject to this issue, and that any Private Link-supported service, including Key Vaults, is potentially at risk.
What you should know: More than 5% of Azure storage accounts are already configured this way, and a single Private Endpoint created in another virtual network can silently break resolution for workloads that were working minutes earlier. Microsoft's fallback-to-internet option restores connectivity but routes traffic off the Azure backbone, so the fix trades away part of what Private Link was adopted to provide.
Read the original at Unit 42 Palo Alto Networks ↗
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