CVE-2023-48951

What it actually does

A flaw in the box_equal function allows a specially crafted SELECT statement to trigger a crash or resource exhaustion in the database server, resulting in denial of service.

Why it matters to the business

Database services become unavailable, interrupting applications that rely on the server and potentially causing extended downtime until the process is restarted.

How an attack unfolds

An attacker with network access sends a malicious SELECT query that reaches the vulnerable box_equal function, causing the server to terminate or become unresponsive without requiring authentication.

How to fix it

Upgrade to a version containing a fix for the box_equal function when released; in the interim restrict direct query access and monitor for abnormal query patterns.

How to confirm the fix worked

Attempt reproduction with the known SELECT pattern in a test environment and confirm the server no longer crashes; review release notes for the resolved issue.

Typical attack path

1. Identify exposed Virtuoso instances via network scanning
2. Craft and transmit a SELECT statement targeting the box_equal function
3. Observe server crash or hang confirming successful denial of service

How to detect it

Inspect database query logs and error logs for unusual SELECT statements that reference box_equal or cause abrupt process termination.

• box_equal
• SELECT.*box_equal

What your security team should do

• Apply available updates immediately once released due to public exploit availability
• Restrict unauthenticated query access to the database
• Monitor logs for repeated or malformed SELECT statements