Description

A SQL injection vulnerability has been identified within the application. User inputs are incorporated into SQL queries without proper validation or parameterization, allowing an attacker to alter their logic. This flaw can be exploited to perform unauthorized actions on the database (reading, modifying, or deleting data) and, in some cases, may lead to command execution on the underlying system.

Limited technical details disclosed

No additional technical details are being disclosed at this stage in order to reduce the potential impact these vulnerabilities could have on self-hosted instances. For the moment, this will remain the case until we receive approval from ANSSI. This article is not an exploitation tutorial, and I disclaim all responsibility for any malicious use or damage resulting from the information provided.

Attack Vectors

• Network access: Fully remote, no authentication required
• Protocol: HTTP/HTTPS
• User interaction: None required
• Injection point: [GET/POST parameter, HTTP header, cookie, etc.]

Triggered by injecting SQL metacharacters (', --, ; DROP TABLE) into the affected field.

Impact

Successful exploitation of this vulnerability allows an attacker to:

• Bypass authentication mechanisms and gain unauthorized access to the application
• Create accounts with elevated privileges, including administrative accounts
• Access sensitive data stored in the database (credentials, personal data, business data)
• Modify or delete database records, compromising data integrity and availability
• Potentially compromise the underlying system, depending on the database configuration
• In certain contexts, execute remote code (Remote Code Execution) via specific DBMS features (e.g., xp_cmdshell, INTO OUTFILE, etc.)

Possible Mitigation

The following measures are recommended to remediate the vulnerability:

• Use parameterized queries (prepared statements): never directly concatenate user input into SQL queries
• Rely on an ORM (Object-Relational Mapping) to handle query security automatically
• Implement strict input validation based on whitelisting
• Apply the principle of least privilege: the database account used by the application should have only the minimum required permissions
• Secure error handling: do not expose SQL error messages or technical stack traces to end users

Auteurs

• Noé Susset
• Yassine Damiri