CVE-2025-12939: Janobe Interview Management System SQLi

CVE-2025-12939 Overview

A SQL injection vulnerability has been discovered in SourceCodester Interview Management System version 1.0. This security flaw exists within the /addCandidate.php file, where improper handling of the candName parameter allows attackers to inject malicious SQL commands. The vulnerability can be exploited remotely by authenticated users, potentially leading to unauthorized data access, modification, or deletion within the application's database.

Critical Impact

Attackers can exploit this SQL injection vulnerability to extract sensitive candidate and interview data, modify database records, or potentially compromise the underlying database server through the vulnerable candName parameter in the candidate management functionality.

Affected Products

• Janobe Interview Management System version 1.0
• SourceCodester Interview Management System up to version 1.0

Discovery Timeline

• 2025-11-10 - CVE-2025-12939 published to NVD
• 2025-11-17 - Last updated in NVD database

Technical Details for CVE-2025-12939

Vulnerability Analysis

This SQL injection vulnerability (CWE-89) affects the candidate registration functionality within the Interview Management System. The vulnerable endpoint /addCandidate.php fails to properly sanitize or parameterize user input passed through the candName argument before incorporating it into SQL queries. This allows attackers with low-privilege access to inject arbitrary SQL statements that are then executed by the database server with the application's database privileges.

The vulnerability is classified under both CWE-89 (Improper Neutralization of Special Elements used in an SQL Command) and CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component), indicating that the application lacks adequate input validation and output encoding mechanisms.

Root Cause

The root cause of this vulnerability is the direct use of user-supplied input in SQL query construction without proper sanitization, parameterization, or use of prepared statements. The candName parameter is likely concatenated directly into SQL query strings within the /addCandidate.php script, allowing special SQL characters and commands to be interpreted as part of the query logic rather than as data values.

Attack Vector

The attack can be launched remotely over the network by any authenticated user with access to the candidate management functionality. An attacker can craft malicious input containing SQL syntax within the candName field when adding a new candidate. This injected SQL code is then processed by the database, allowing the attacker to perform unauthorized operations such as:

• Extracting sensitive data from the database using UNION-based or error-based injection techniques
• Modifying or deleting existing records
• Bypassing application-level access controls
• Potentially escalating to command execution if database features like xp_cmdshell (SQL Server) or INTO OUTFILE (MySQL) are available

The exploit has been publicly disclosed, increasing the risk of widespread exploitation. Technical details can be found in the GitHub CVE Issue Discussion and VulDB entry #331663.

Detection Methods for CVE-2025-12939

Indicators of Compromise

• Unusual SQL error messages appearing in application logs related to the /addCandidate.php endpoint
• Database queries containing suspicious patterns such as UNION SELECT, OR 1=1, ' --, or encoded SQL keywords
• Unexpected database activity including bulk data extraction, schema enumeration, or privilege escalation attempts
• Access logs showing repeated requests to /addCandidate.php with abnormally long or encoded candName parameter values

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block common SQL injection patterns in HTTP request parameters
• Implement database activity monitoring to identify anomalous queries originating from the web application
• Configure intrusion detection systems (IDS) to alert on SQL injection signatures targeting the candName parameter
• Enable detailed logging on the /addCandidate.php endpoint and correlate with database query logs for forensic analysis

Monitoring Recommendations

• Monitor web server access logs for requests to /addCandidate.php containing SQL metacharacters such as single quotes, semicolons, or comment delimiters
• Set up alerts for database errors or exceptions that may indicate attempted SQL injection exploitation
• Implement real-time monitoring of database connections and query patterns for signs of data exfiltration
• Review authentication logs for accounts frequently accessing the vulnerable candidate management functionality

How to Mitigate CVE-2025-12939

Immediate Actions Required

• Restrict access to the /addCandidate.php endpoint to trusted users only until a patch is available
• Implement input validation at the application level to reject malicious SQL patterns in the candName parameter
• Deploy WAF rules specifically designed to protect against SQL injection attacks on candidate management endpoints
• Review database privileges to ensure the application uses minimum required permissions

Patch Information

As of the last NVD update on 2025-11-17, no official patch has been released by the vendor. Organizations using SourceCodester Interview Management System should monitor the SourceCodester website for security updates. In the absence of an official patch, implementing the workarounds below is critical to reduce exposure to this vulnerability.

Workarounds

• Implement server-side input validation to sanitize the candName parameter, stripping or escaping SQL metacharacters before processing
• Modify the application code to use prepared statements or parameterized queries instead of string concatenation for database operations
• Add a WAF rule to filter requests to /addCandidate.php that contain SQL injection patterns
• Consider temporarily disabling the candidate registration feature if it is not business-critical until proper remediation is in place
• Restrict network access to the vulnerable application to internal networks or VPN-only access

# Example: Apache mod_security rule to block SQL injection attempts
SecRule ARGS:candName "@detectSQLi" \
    "id:100001,\
    phase:2,\
    deny,\
    status:403,\
    msg:'SQL Injection Attempt Detected on candName parameter',\
    log,\
    auditlog"