Stack Buffer Overflow in PostgreSQL

Executive Summary

This is a stack buffer overflow in PostgreSQL that happens when matching argument names. An object creator can exploit it by manipulating OUT parameter counts to write only the bytes 0x0 and 0x1 to server memory, leading to potential unknown impacts. Affected versions are all releases before PostgreSQL 18.5, 17.11, 16.15, 15.19, and 14.24.

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Detection Guidance

Detecting this vulnerability requires checking PostgreSQL versions. Run 'psql --version' to see your installed version. If it is below 18.5, 17.11, 16.15, 15.19, or 14.24, the system is vulnerable. Additionally, monitor PostgreSQL logs for unusual activity or crashes that may indicate exploitation attempts.

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Impact Analysis

The vulnerability could allow an attacker to write limited data to server memory, potentially causing crashes, data corruption, or unauthorized access. Since only 0x0 and 0x1 bytes can be written, the impact may be constrained but still significant enough to disrupt operations or enable further exploits.

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Compliance Impact

This vulnerability could potentially impact compliance with GDPR and HIPAA by allowing unauthorized memory manipulation through a stack buffer overflow. The ability to write specific bytes to server memory may lead to data integrity issues or unauthorized access, which are critical concerns under these regulations.

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Mitigation Strategies

Immediately upgrade PostgreSQL to a patched version: 18.5, 17.11, 16.15, 15.19, or 14.24 or later. Avoid creating objects with manipulated OUT parameters until the upgrade is complete. Restrict access to PostgreSQL users who can create objects to reduce attack surface.

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