Executive Summary

This vulnerability is a high-severity SQL injection issue in the WeKnora framework's database query tool when the Agent service is enabled. Due to insufficient backend validation of SQL queries, attackers can use crafted prompts to bypass query restrictions. Specifically, the system fails to properly check for dangerous PostgreSQL built-in functions and does not handle SQL comments that can obfuscate malicious queries. This allows attackers to execute unauthorized SQL commands, access sensitive information from the database, enumerate database contents, and even read or write files on the PostgreSQL server. [1]

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Impact Analysis

This vulnerability can have severe impacts including unauthorized access to all database contents across multiple tenants, exposure of sensitive information, and potential manipulation of data integrity. Attackers can also list and access PostgreSQL server files, enabling them to read or write files on the server. Overall, it compromises confidentiality, integrity, and availability of the system, potentially leading to data breaches and service disruptions. [1]

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Detection Guidance

Detection of this vulnerability involves monitoring for unusual or crafted SQL queries that attempt to bypass backend validation, especially those using PostgreSQL built-in functions like pg_ls_dir or queries containing obfuscated SQL comments (e.g., /**/). Since the vulnerability exploits prompt-based SQL injection via the WeKnora Agent service, inspecting logs for suspicious raw SQL queries executed by the database query tool is recommended. Specific commands depend on your logging setup, but generally, you can search database logs or application logs for queries containing 'pg_ls_dir', 'pg_language', or unusual comment patterns. For example, using grep on logs: `grep -E "pg_ls_dir|pg_language|\/\*\*\/" /path/to/weknora/logs/*` or monitoring network traffic for suspicious SQL payloads targeting the Agent service. Additionally, checking the version of WeKnora to ensure it is 0.2.5 or later helps confirm if the vulnerability is present. [1]

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Mitigation Strategies

The immediate mitigation step is to upgrade WeKnora to version 0.2.5 or later, where the vulnerability has been patched by reconstructing the SQL security validation mechanism using the official PostgreSQL parser. This update significantly improves query protection and prevents prompt-based bypass techniques. If upgrading is not immediately possible, consider disabling the Agent service to prevent access to the vulnerable database query tool. Additionally, monitor and restrict access to the service to trusted users only and audit logs for suspicious activity until the patch can be applied. [1, 2]

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Compliance Impact

This vulnerability allows attackers to bypass query restrictions and access sensitive information from the target server and database, leading to high confidentiality, integrity, and availability impacts. Such unauthorized access to sensitive data can result in non-compliance with data protection regulations like GDPR and HIPAA, which require strict controls to protect personal and sensitive information. Therefore, exploitation of this vulnerability could lead to violations of these standards due to data breaches and unauthorized data exposure. [1]

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