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A team of researchers found two vulnerabilities in Microsoft’s Azure PostgreSQL Flexible Server that when chained together allowed them to access the PostgreSQL databases of other cloud tenants. The attack, dubbed ExtraReplica because it abused functionality related to database replication, combines a privilege escalation vulnerability that gave them the ability to execute code inside the container hosting their own database and another authentication bypass issue that allowed them to abuse the system’s replication service to access other users’ databases.

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