CVE-2024-8340: Electric Billing Management System SQLi

CVE-2024-8340 Overview

A critical SQL injection vulnerability has been identified in SourceCodester Electric Billing Management System version 1.0. The vulnerability exists in the /Actions.php?a=login file, where improper handling of the username parameter allows attackers to inject malicious SQL commands. This flaw can be exploited remotely without authentication, potentially leading to unauthorized database access, data theft, and system compromise.

Critical Impact

Remote attackers can exploit this SQL injection vulnerability to bypass authentication, extract sensitive billing and customer data, modify database records, or potentially gain further access to the underlying server infrastructure.

Affected Products

• SourceCodester Electric Billing Management System 1.0
• oretnom23 electric_billing_management_system

Discovery Timeline

• 2024-08-30 - CVE-2024-8340 published to NVD
• 2024-09-04 - Last updated in NVD database

Technical Details for CVE-2024-8340

Vulnerability Analysis

This SQL injection vulnerability (CWE-89) affects the login functionality of the Electric Billing Management System. The application fails to properly sanitize user-supplied input in the username parameter before incorporating it into SQL queries. This allows attackers to manipulate the query structure and execute arbitrary SQL commands against the backend database.

The vulnerability is particularly dangerous because it exists in the authentication mechanism, which is typically exposed to unauthenticated users. An attacker can leverage this flaw to bypass login controls entirely or extract sensitive data from the database including customer billing information, credentials, and personal details.

Root Cause

The root cause of this vulnerability is improper input validation and lack of parameterized queries in the Actions.php file. When processing login requests, the application directly concatenates user-supplied input into SQL statements without proper sanitization or escaping. This classic SQL injection pattern occurs when the username parameter is passed directly to database queries without using prepared statements or input validation mechanisms.

Attack Vector

The attack can be initiated remotely over the network without requiring any prior authentication or user interaction. An attacker simply needs to craft a malicious HTTP request to the /Actions.php?a=login endpoint with a specially crafted username parameter containing SQL injection payloads.

Common attack techniques include:

• Authentication bypass using payloads like ' OR '1'='1 in the username field
• UNION-based injection to extract data from other database tables
• Time-based blind SQL injection to enumerate database contents
• Stacked queries to execute multiple SQL statements including data modification or deletion

Technical details and analysis of this vulnerability are available in the GitHub SQL Injection Analysis documentation.

Detection Methods for CVE-2024-8340

Indicators of Compromise

• Unusual SQL error messages appearing in web server logs or application responses
• Abnormal login attempts with suspicious characters (', ", --, ;, OR, UNION) in username fields
• Database queries with unexpected execution patterns or access to tables outside normal application scope
• Multiple failed authentication attempts followed by successful login without valid credentials

Detection Strategies

• Deploy Web Application Firewalls (WAF) with SQL injection detection rules targeting the /Actions.php endpoint
• Implement application-layer logging to capture all authentication requests and parameters
• Monitor database query logs for anomalous patterns including UNION SELECT statements and comment sequences
• Configure intrusion detection systems to alert on common SQL injection payload signatures

Monitoring Recommendations

• Enable detailed logging on web servers to capture full request parameters for authentication endpoints
• Set up real-time alerts for database errors that may indicate injection attempts
• Monitor for unusual data access patterns in the electric billing database tables
• Review authentication logs regularly for signs of brute force or injection-based bypass attempts

How to Mitigate CVE-2024-8340

Immediate Actions Required

• Restrict network access to the Electric Billing Management System to trusted IP addresses only
• Implement a Web Application Firewall with SQL injection protection rules in front of the application
• Review database permissions and ensure the application uses a least-privilege database account
• Enable comprehensive logging on all authentication endpoints for forensic purposes

Patch Information

No official vendor patch information is currently available for this vulnerability. Organizations using SourceCodester Electric Billing Management System 1.0 should contact the vendor directly for remediation guidance or consider implementing the source code fixes outlined below. Additional vulnerability information is available at VulDB #276219.

Workarounds

• Implement input validation on the username parameter to reject characters commonly used in SQL injection attacks
• Modify the source code to use prepared statements or parameterized queries instead of direct string concatenation
• Deploy the application behind a reverse proxy with SQL injection filtering capabilities
• Consider replacing the vulnerable system with a more secure billing management solution until an official patch is available

# Configuration example - Apache mod_security SQL injection protection
# Add to httpd.conf or .htaccess

SecRule REQUEST_URI "/Actions.php" "id:100001,phase:2,deny,status:403,chain"
SecRule ARGS:username "@detectSQLi" "log,msg:'SQL Injection attempt blocked'"

# Block common SQL injection patterns
SecRule ARGS "@rx (\b(union|select|insert|update|delete|drop|alter)\b)" \
    "id:100002,phase:2,deny,status:403,log,msg:'SQL keyword blocked'"