CVE-2025-11108: Simple Scheduling System SQL Injection

CVE-2025-11108 Overview

A SQL Injection vulnerability has been identified in Fabian Simple Scheduling System version 1.0. The vulnerability exists in the /schedulingsystem/addroom.php file, where the room parameter is not properly sanitized before being used in database queries. This allows remote attackers to manipulate SQL queries and potentially gain unauthorized access to sensitive data, modify database contents, or compromise the underlying system.

Critical Impact

Remote attackers can exploit this SQL injection vulnerability to extract sensitive information from the database, modify or delete data, and potentially achieve further system compromise through database-level access.

Affected Products

• Fabian Simple Scheduling System 1.0
• code-projects Simple Scheduling System 1.0

Discovery Timeline

• 2025-09-28 - CVE-2025-11108 published to NVD
• 2025-10-23 - Last updated in NVD database

Technical Details for CVE-2025-11108

Vulnerability Analysis

This SQL injection vulnerability resides in the addroom.php file within the Simple Scheduling System application. The vulnerability is classified under CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component), which encompasses injection flaws where user-controlled input is not properly sanitized before being processed by an interpreter.

The vulnerable endpoint accepts the room parameter without adequate input validation or parameterized query implementation. When an attacker submits malicious SQL syntax through this parameter, the application directly incorporates the unsanitized input into SQL queries, enabling arbitrary database manipulation.

The exploit has been publicly disclosed, increasing the urgency for organizations using this software to implement protective measures. The network-accessible nature of this vulnerability means that any instance of the application exposed to the internet or untrusted networks is at risk.

Root Cause

The root cause of this vulnerability is insufficient input validation and the use of dynamic SQL query construction. The room parameter in /schedulingsystem/addroom.php is directly concatenated into SQL statements without proper sanitization, prepared statements, or parameterized queries. This coding practice violates secure development principles and enables attackers to inject malicious SQL code that the database engine executes as legitimate commands.

Attack Vector

This vulnerability can be exploited remotely over the network. An attacker does not require authentication or prior access to the target system to exploit this flaw. By crafting malicious HTTP requests to the addroom.php endpoint with specially crafted SQL injection payloads in the room parameter, an attacker can:

1. Extract sensitive data from the database including user credentials and scheduling information
2. Modify or delete existing database records
3. Bypass authentication mechanisms if user tables are accessible
4. Potentially execute operating system commands if database permissions allow (via techniques like xp_cmdshell on MSSQL or INTO OUTFILE on MySQL)

The attack requires no user interaction, making it particularly dangerous for exposed installations. For detailed technical analysis, refer to the GitHub Issue Discussion and VulDB #326189.

Detection Methods for CVE-2025-11108

Indicators of Compromise

• Unusual SQL error messages in application logs from /schedulingsystem/addroom.php
• HTTP requests to addroom.php containing SQL keywords such as UNION, SELECT, INSERT, DROP, or comment characters (--, /*)
• Unexpected database queries or data modifications in database audit logs
• Web server access logs showing requests with encoded SQL syntax in the room parameter

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block common SQL injection patterns targeting the room parameter
• Configure database activity monitoring to alert on anomalous query patterns or unauthorized data access
• Deploy intrusion detection systems with signatures for SQL injection attack patterns
• Review application logs for failed or malformed requests to the vulnerable endpoint

Monitoring Recommendations

• Enable detailed logging for the addroom.php endpoint and monitor for suspicious parameter values
• Set up alerts for database errors that may indicate injection attempts
• Monitor network traffic for unusual outbound connections from the database server
• Establish baseline database query patterns and alert on significant deviations

How to Mitigate CVE-2025-11108

Immediate Actions Required

• Restrict access to the /schedulingsystem/addroom.php endpoint using network-level controls or authentication requirements
• Deploy a Web Application Firewall (WAF) with SQL injection protection rules in front of the application
• Consider taking the affected application offline if it contains sensitive data and cannot be immediately patched
• Audit database logs for signs of past exploitation attempts

Patch Information

No official vendor patch has been identified at this time. Organizations should monitor the Code Projects Resource for updates. In the absence of an official patch, implement the workarounds and protective measures outlined below to reduce risk exposure. Consider implementing custom code fixes using prepared statements and parameterized queries for the affected endpoint.

Workarounds

• Implement input validation to reject special characters and SQL keywords in the room parameter
• Modify the application code to use prepared statements or parameterized queries for all database interactions
• Apply the principle of least privilege to the database account used by the application
• Deploy network segmentation to limit access to the vulnerable application from untrusted networks
• Use stored procedures with proper input handling as an additional layer of defense

# Example Apache .htaccess rule to block suspicious requests
<IfModule mod_rewrite.c>
    RewriteEngine On
    # Block requests containing common SQL injection patterns
    RewriteCond %{QUERY_STRING} (union|select|insert|drop|update|delete|concat|char|cast) [NC]
    RewriteRule ^schedulingsystem/addroom\.php$ - [F,L]
</IfModule>