CVE-2024-1831: Complete File Management System SQLi Flaw

CVE-2024-1831 Overview

A critical SQL injection vulnerability has been identified in SourceCodester Complete File Management System version 1.0. The vulnerability exists in the Login Form component, specifically within the users/index.php file. An attacker can exploit this flaw by manipulating the username parameter with crafted SQL injection payloads to bypass authentication and potentially gain unauthorized access to the underlying database.

Critical Impact

This SQL injection vulnerability allows unauthenticated remote attackers to bypass login authentication, access sensitive data, and potentially execute arbitrary SQL commands on the backend database.

Affected Products

• Complete File Management System 1.0 by Nelzkie15/SourceCodester
• Web applications using the affected users/index.php Login Form component

Discovery Timeline

• 2024-02-23 - CVE CVE-2024-1831 published to NVD
• 2024-12-17 - Last updated in NVD database

Technical Details for CVE-2024-1831

Vulnerability Analysis

This SQL injection vulnerability stems from improper input validation in the login form's username parameter. The application fails to properly sanitize user-supplied input before incorporating it into SQL queries, allowing attackers to inject malicious SQL statements. The vulnerability enables authentication bypass through a classic SQL injection technique where an attacker can manipulate the login logic by injecting conditional statements that always evaluate to true.

The exploit payload torada' or '1' = '1' -- - (URL-encoded as torada%27+or+%271%27+%3D+%271%27+--+-) demonstrates how an attacker can craft input that modifies the intended SQL query structure. This payload effectively comments out the password verification portion of the authentication query, allowing login without valid credentials.

Root Cause

The root cause is the lack of parameterized queries or prepared statements in the users/index.php file. The application directly concatenates user input into SQL queries without proper sanitization or escaping, violating secure coding practices for database interactions. This is classified under CWE-89 (Improper Neutralization of Special Elements used in an SQL Command).

Attack Vector

The attack is network-based and can be executed remotely without authentication. An attacker targets the login form by submitting a specially crafted username value containing SQL metacharacters. The malicious payload exploits the vulnerable query construction to manipulate database logic, enabling authentication bypass or data extraction.

The vulnerability can be exploited through standard HTTP requests to the login endpoint. The attacker crafts a username value that, when processed by the vulnerable query, alters the intended SQL logic. Technical details and analysis are available through the Notion SQL Injection Analysis documentation and VulDB #254622.

Detection Methods for CVE-2024-1831

Indicators of Compromise

• HTTP requests to users/index.php containing SQL injection patterns such as ' or '1'='1, --, or UNION SELECT in the username parameter
• Unusual successful authentication events from unknown IP addresses or without corresponding valid credential usage
• Database query logs showing anomalous SQL statements with injected conditional logic
• Error messages in application logs revealing SQL syntax errors from malformed injection attempts

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block common SQL injection payloads in form submissions
• Implement intrusion detection signatures for SQL metacharacters (', --, /*, UNION, SELECT) in HTTP POST parameters
• Enable detailed logging on the database server to capture and alert on suspicious query patterns
• Configure application-level monitoring to flag login attempts with abnormal username field lengths or special characters

Monitoring Recommendations

• Monitor authentication logs for login bypass attempts, particularly successful logins without valid password verification
• Establish baseline metrics for login form submissions and alert on statistical anomalies
• Review web server access logs for repeated requests to users/index.php with encoded special characters
• Implement real-time alerting for database errors that may indicate injection attempt failures

How to Mitigate CVE-2024-1831

Immediate Actions Required

• Remove or restrict access to the Complete File Management System 1.0 application until patched or replaced
• Implement input validation and parameterized queries in the users/index.php file
• Deploy a Web Application Firewall (WAF) with SQL injection protection rules in front of the application
• Audit database accounts used by the application and restrict privileges to minimum required

Patch Information

At the time of publication, no official vendor patch has been released for this vulnerability. Organizations using Complete File Management System 1.0 should contact the vendor or consider migrating to a more secure alternative. For technical details, refer to the VulDB #254622 Technical Detail.

Workarounds

• Implement server-side input validation to reject username values containing SQL metacharacters (', ", --, ;, /*, */)
• Modify the vulnerable code to use prepared statements with parameterized queries instead of string concatenation
• Place the application behind a reverse proxy with SQL injection filtering capabilities
• Restrict network access to the application to trusted IP addresses only until a permanent fix is applied

# Example .htaccess rule to block common SQL injection patterns
RewriteEngine On
RewriteCond %{QUERY_STRING} (\%27)|(\')|(\-\-)|(\%23)|(#) [NC,OR]
RewriteCond %{QUERY_STRING} (union.*select) [NC,OR]
RewriteCond %{QUERY_STRING} (select.*from) [NC]
RewriteRule ^(.*)$ - [F,L]