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The vulnerability in the AWS Advanced JDBC Wrapper for Aurora PostgreSQL stems from improper access control when handling user-defined functions. A low-privilege database user, authenticated via the JDBC wrapper, can craft a specific function. Due to a flaw in the wrapper’s session management or its interaction with the RDS proxy, this function may be executed in a context with elevated permissions. Instead of running with the invoker’s privileges, the function incorrectly inherits the permissions of a higher-privileged RDS user, potentially the `rds_superuser` role. This occurs during the wrapper’s internal process for executing certain PostgreSQL commands, allowing the attacker to bypass intended security boundaries and gain unauthorized superuser access to the database instance.
Platform: AWS Aurora PostgreSQL
Version: < 2.6.5
Vulnerability: Privilege Escalation
Severity: High
date: 2025-11-10
Prediction: Patch 2025-11-13
What Undercode Say:
Check current wrapper version in your project find . -name "pom.xml" -o -name "build.gradle" | xargs grep "aws-advanced-jdbc-wrapper" Simulate connection string for testing echo "jdbc:wrapper:postgresql://my-cluster.cluster-xxxxxx.us-east-1.rds.amazonaws.com:5432/myDB"
// Example code snippet demonstrating a potentially vulnerable connection setup
Properties props = new Properties();
props.setProperty("user", "low_priv_user");
props.setProperty("password", "password");
// Using a vulnerable wrapper version < 2.6.5
Connection conn = DriverManager.getConnection("jdbc:wrapper:postgresql://host/db", props);
How Exploit:
1. Attacker authenticates as a low-privilege user.
2. Creates a malicious PostgreSQL function.
- The wrapper executes it with elevated `rds_superuser` permissions.
4. Attacker gains full database control.
Protection from this CVE
Upgrade to version 2.6.5. Implement network policies restricting database access. Apply the principle of least privilege for database users.
Impact:
Unauthorized superuser access. Complete database compromise. Data breach potential.
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Sources:
Reported By: github.com
Extra Source Hub:
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