SQL Injection in Search Endpoint

Abstract

This research documents a SQL Injection vulnerability discovered during a web application security assessment. The issue allowed an attacker to manipulate backend database queries through an unsanitized input parameter. Depending on database privileges, successful exploitation could result in unauthorized data disclosure and complete database compromise.

Information

Executive Summary

The vulnerable endpoint accepted user-controlled input without proper parameterization. Because the backend dynamically concatenated SQL statements, specially crafted payloads modified the original query logic.

The vulnerability affected the application’s search functionality and could potentially expose confidential information stored in the database.

Scope

The following assessment was performed against a controlled environment.

• Search endpoint
• Authentication module
• Database interaction layer

No production systems were harmed during this research.

Technical Details

GET /search?q=test

query = f"SELECT * FROM users WHERE name='{keyword}'"

Proof of Concept

Example payload:

' OR '1'='1

Result:

Application returned every user record.

Impact

Successful exploitation may allow an attacker to:

• Read sensitive database records.
• Enumerate application users.
• Bypass authentication mechanisms.
• Execute arbitrary SQL statements (depending on DBMS permissions).

CVSS Assessment

Overall Severity: High

Mitigation

Recommended remediation includes:

• Use prepared statements.
• Apply parameterized queries.
• Validate all user input.
• Implement least-privilege database accounts.
• Perform regular security testing.

References

• OWASP SQL Injection Prevention Cheat Sheet
• CWE-89
• MITRE ATT&CK

Timeline

Conclusion

The identified SQL Injection vulnerability demonstrates the importance of secure database interaction practices. By adopting parameterized queries and enforcing defense-in-depth strategies, organizations can significantly reduce the risk of injection attacks.

Keywords

SQL Injection · OWASP · Web Security · Database Security · Penetration Testing