CVE-2021-43140 in Simple Subscription Website
Summary
by MITRE • 11/03/2021
SQL Injection vulnerability exists in Sourcecodester. Simple Subscription Website 1.0. via the login.
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Analysis
by VulDB Data Team • 02/24/2025
The SQL injection vulnerability identified in CVE-2021-43140 affects the Sourcecodester Simple Subscription Website version 1.0, specifically within the login functionality. This represents a critical security flaw that allows attackers to manipulate database queries through malicious input. The vulnerability stems from insufficient input validation and sanitization in the authentication mechanism, creating an exploitable entry point for unauthorized database access. According to CWE-89, this classification indicates a direct SQL injection weakness where user-supplied data is improperly incorporated into SQL command strings without adequate escaping or parameterization. The attack vector specifically targets the login form where username and password fields are processed, enabling adversaries to inject malicious SQL code that can bypass authentication mechanisms.
The operational impact of this vulnerability extends beyond simple authentication bypass, as successful exploitation could enable attackers to extract sensitive user data, modify database records, or even escalate privileges within the application's database layer. Attackers can leverage this weakness to perform union-based SQL injection attacks, potentially accessing the entire user database including hashed passwords, personal information, and subscription details. The vulnerability aligns with ATT&CK technique T1213.002 (Data from Databases) and T1190 (Exploit Public-Facing Application) as it targets publicly accessible web applications through database manipulation techniques. The attack surface is particularly concerning given that this vulnerability affects a subscription website, meaning sensitive financial and personal data could be compromised.
Mitigation strategies for this SQL injection vulnerability must address both immediate remediation and long-term security hardening measures. The primary fix involves implementing proper parameterized queries or prepared statements throughout the application's database interaction code, ensuring that user input is never directly concatenated into SQL commands. Input validation and sanitization should be enforced at multiple layers including application-level filters and database-level protections. Security headers should be implemented to prevent common attack patterns, while regular security testing including automated scanning and manual penetration testing should be conducted. Organizations should also establish proper database access controls, implement account lockout mechanisms, and maintain comprehensive logging of authentication attempts to detect potential exploitation attempts. The remediation process should follow OWASP Top 10 security guidelines and incorporate database security best practices to prevent similar vulnerabilities in future development cycles.