CVE-2024-1824: House Rental Management System SQLi Flaw

CVE-2024-1824 Overview

A critical SQL injection vulnerability has been discovered in CodeAstro House Rental Management System version 1.0. This vulnerability exists in the authentication functionality within the signing.php file, where improper handling of the uname and password parameters allows attackers to inject malicious SQL queries. The vulnerability can be exploited remotely without authentication, potentially leading to complete database compromise, unauthorized data access, and system takeover.

Critical Impact

Unauthenticated attackers can remotely exploit this SQL injection vulnerability to bypass authentication, extract sensitive data from the database, modify or delete records, and potentially gain control of the underlying server.

Affected Products

• CodeAstro House Rental Management System 1.0

Discovery Timeline

• 2024-02-23 - CVE-2024-1824 published to NVD
• 2024-12-06 - Last updated in NVD database

Technical Details for CVE-2024-1824

Vulnerability Analysis

This SQL injection vulnerability affects the login functionality of the House Rental Management System. The signing.php file fails to properly sanitize user-supplied input in the uname and password parameters before incorporating them into SQL queries. This lack of input validation allows an attacker to craft malicious input containing SQL syntax that alters the intended query logic.

The vulnerability is particularly severe because it exists in the authentication mechanism, which is typically the first point of contact for users. Successful exploitation allows attackers to bypass authentication entirely, access administrative functions, extract tenant and property information, financial records, and other sensitive data stored in the application's database.

Root Cause

The root cause of this vulnerability is the failure to implement proper input validation and parameterized queries in the signing.php authentication file. The application directly concatenates user-supplied values from the uname and password form fields into SQL query strings without proper sanitization or the use of prepared statements. This classic SQL injection pattern allows attackers to escape the intended query context and inject arbitrary SQL commands.

Attack Vector

The attack can be launched remotely over the network against any exposed instance of the House Rental Management System. An attacker can exploit this vulnerability by submitting specially crafted values in the username or password fields of the login form. Since no authentication is required to access the login page, and the vulnerability requires no special privileges or user interaction to exploit, the attack surface is significant. The exploit has been publicly disclosed, making it accessible to a wide range of threat actors.

Common exploitation techniques include:

• Authentication bypass using classic SQL injection payloads such as ' OR '1'='1
• Union-based injection to extract data from other database tables
• Time-based blind injection to enumerate database contents when direct output is not visible
• Stacked queries to execute multiple SQL statements including data modification or deletion

Detection Methods for CVE-2024-1824

Indicators of Compromise

• Unusual login attempts containing SQL syntax characters such as single quotes, double dashes, semicolons, or SQL keywords in username/password fields
• Database error messages appearing in application logs or HTTP responses indicating malformed SQL queries
• Unexpected database queries against system tables or non-application tables in database logs
• Multiple rapid authentication requests from a single IP address with varying payloads

Detection Strategies

• Deploy a Web Application Firewall (WAF) with SQL injection detection rules to inspect HTTP POST parameters to signing.php
• Implement database activity monitoring to detect anomalous queries, especially those targeting system catalog tables or using UNION statements
• Configure application logging to capture all authentication attempts including the full request parameters (with sensitive data masked)
• Monitor for HTTP responses containing database error messages which may indicate exploitation attempts

Monitoring Recommendations

• Enable detailed logging on the web server and database server with centralized log aggregation
• Set up alerting for patterns indicative of SQL injection such as SQL keywords in form submissions
• Monitor database user permissions and alert on unauthorized privilege escalation attempts
• Implement network traffic analysis to detect data exfiltration patterns following potential exploitation

How to Mitigate CVE-2024-1824

Immediate Actions Required

• Immediately restrict access to the House Rental Management System to trusted IP addresses only if possible
• Take the application offline if it contains sensitive data and cannot be protected by other means
• Review database logs for evidence of prior exploitation and conduct incident response if compromise is detected
• Deploy a Web Application Firewall with SQL injection protection as a temporary mitigation layer

Patch Information

As of the last update, no official vendor patch has been released for this vulnerability. Organizations using CodeAstro House Rental Management System 1.0 should contact the vendor for security updates or consider the following alternatives:

• Migrate to an alternative property management solution with better security practices
• Engage a security professional to implement code-level fixes if source code access is available
• Refer to the VulDB advisory for ongoing tracking of this vulnerability

Workarounds

• Implement prepared statements with parameterized queries in the signing.php file if source code modification is possible
• Deploy input validation to reject any authentication attempts containing SQL metacharacters
• Use a reverse proxy or WAF configured to sanitize input to the affected endpoint
• Restrict database user permissions to minimum required privileges to limit the impact of successful exploitation
• Segment the database server from the internet and implement strict firewall rules

If source code access is available, the signing.php file should be modified to use parameterized queries. The vulnerable code pattern of directly concatenating user input into SQL strings should be replaced with prepared statements using bound parameters. Additionally, implement input validation to restrict the character set accepted in the uname and password fields to alphanumeric characters where appropriate.