CVE-2025-67509: Neuron MySQLSelectTool “read-only” bypass via `SELECT ... INTO OUTFILE` (file write → potential RCE)

MySQLSelectTool is intended to be a read-only SQL tool (e.g., for LLM agent querying). However, validation based on the first keyword (e.g., SELECT) and a forbidden-keyword list does not block file-writing constructs such as INTO OUTFILE / INTO DUMPFILE.

As a result, an attacker who can influence the tool input (e.g., prompt injection through a public agent endpoint) may be able to write arbitrary content to files on the DB server.

If the MySQL/MariaDB account has the FILE privilege and server configuration permits writes to a useful location (e.g., a web-accessible directory), the impact can escalate to remote code execution on the application host (for example, by writing a PHP web shell).

Who is impacted: Deployments that expose an agent using MySQLSelectTool to untrusted input and run with overly-permissive DB privileges/configuration.