Executive Summary

PostgreSQL Anonymizer contains a vulnerability that allows a user to gain superuser privileges by creating a table and placing malicious code inside a column identifier.

If a superuser calls the k-anonymity function, the malicious code is executed with superuser privileges.

The risk is higher with PostgreSQL 14 or with instances upgraded from PostgreSQL 14 or a prior version.

In PostgreSQL 15 and later, the creation permission on the public schema is revoked by default, so this exploit can only be achieved by a user explicitly granted the CREATE TABLE privilege.

The vulnerability is fixed in PostgreSQL Anonymizer version 3.1.0 and later.

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Impact Analysis

This vulnerability can allow an attacker to escalate their privileges to superuser level within the PostgreSQL environment.

With superuser privileges, the attacker can execute arbitrary code with the highest level of access, potentially compromising the entire database system.

This can lead to unauthorized data access, data modification, or disruption of database services.

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Mitigation Strategies

To mitigate this vulnerability, you should upgrade PostgreSQL Anonymizer to version 3.1.0 or later, where the issue is resolved.

Additionally, for PostgreSQL 15 and later, ensure that users are not granted CREATE TABLE privileges on the public schema unless necessary, as this reduces the risk of exploitation.

For PostgreSQL 14 or instances upgraded from version 14 or earlier, consider restricting superuser access and monitoring the use of the k-anonymity function to prevent execution of malicious code.

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Compliance Impact

The vulnerability in PostgreSQL Anonymizer allows a user to gain superuser privileges through malicious code execution when a superuser calls the k-anonymity function. This escalation of privileges can lead to unauthorized access and potential data breaches.

Such unauthorized access and potential data breaches can negatively impact compliance with data protection standards and regulations like GDPR and HIPAA, which require strict controls over access to sensitive data and protection against unauthorized disclosure.

However, the vulnerability is resolved in PostgreSQL Anonymizer version 3.1.0 and later, and mitigations exist in PostgreSQL 15 and later versions that reduce the risk by revoking creation permissions by default.

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