C4G Basic Laboratory SQLi (CVE-2019-25678)

Overview

CVE-2019-25678 is a high-severity SQL injection vulnerability in C4G Basic Laboratory Information System version 3.4. The flaw exists in the users_select.php endpoint, where the site parameter does not properly sanitize user input. This allows unauthenticated attackers to execute arbitrary SQL commands on the underlying database.

Technical Details

The vulnerability is network-based and requires no authentication or user interaction to exploit, making it particularly dangerous. An attacker can send a specially crafted GET request containing malicious SQL code within the site parameter. Because the application fails to validate this input, the database executes the injected commands. This flaw is a classic example of improper input validation leading to direct SQL injection.

Impact

Successful exploitation allows attackers to read, modify, or delete sensitive information within the database. This includes confidential patient medical records and system administrator credentials. Access to this data could lead to a significant privacy breach, violation of regulations like HIPAA, and full compromise of the Laboratory Information System. For more on the consequences of such data exposure, see our breach reports.

Remediation and Mitigation

The primary remediation is to apply the official patch or upgrade to a fixed version of the software as soon as it is made available by the vendor, C4G. If an immediate patch is not possible, consider the following temporary mitigation strategies:

• Implement a Web Application Firewall (WAF) configured with rules to block SQL injection patterns targeting the vulnerable endpoint.
• If the users_select.php functionality is not essential, block external access to it at the network perimeter using firewall rules.
• Isolate the affected system from the internet and other non-essential network segments to limit the attack surface. Organizations should monitor vendor channels closely for security updates.

Security Insight

This vulnerability highlights the persistent risk in legacy or niche healthcare software, where security development practices may lag. Similar SQLi flaws in other medical systems have directly led to large-scale healthcare data breaches. The existence of such a straightforward, unauthenticated injection flaw in a system handling sensitive patient data suggests a fundamental lack of secure coding review in the software development lifecycle. Stay informed on similar threats by following our security news.

Further Reading

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