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The vulnerability in the AWS Advanced NodeJS Wrapper for Aurora PostgreSQL stems from improper access control. A low-privilege database user, authenticated to the PostgreSQL instance, can craft a specific function. Due to a flaw in the wrapper’s internal permission handling, this user-defined function can be executed in a context with elevated privileges. This exploitation leverages the wrapper’s mechanism for interacting with the RDS extension, allowing the malicious function to inherit the permissions of the rds_superuser role or other high-privilege RDS users, thereby achieving privilege escalation within the database.
Platform: Amazon Aurora PostgreSQL
Version: < 2.0.1
Vulnerability: Privilege Escalation
Severity: High
date: 2025-11-13
Prediction: Patch ETA: 2025-11-20
What Undercode Say:
git clone https://github.com/aws/aws-advanced-nodejs-wrapper cd aws-advanced-nodejs-wrapper git checkout v2.0.0 grep -r "rds_superuser" .
CREATE OR REPLACE FUNCTION evil_func()
RETURNS void AS $$
BEGIN
EXECUTE 'ALTER ROLE low_priv_user CREATEDB';
END;
$$ LANGUAGE plpgsql;
SELECT aws_wrapper_invoke('evil_func');
How Exploit:
Authenticated low-privilege user creates a malicious PostgreSQL function. The function executes ALTER ROLE or other DDL commands. Attacker uses the vulnerable wrapper API to invoke the function, which runs with rds_superuser privileges, escalating their access.
Protection from this CVE:
Upgrade to v2.0.1. Implement principle of least privilege for database users. Restrict network access to the database instance. Audit existing functions and user roles.
Impact:
Full database compromise. Unauthorized data access, modification, or destruction. Bypass of security controls. Potential pivot to underlying host.
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Sources:
Reported By: github.com
Extra Source Hub:
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