CVE-2025-0929: TeamCal Neo SQL Injection Vulnerability

CVE-2025-0929 Overview

CVE-2025-0929 is a critical SQL injection vulnerability affecting TeamCal Neo, a web-based team calendar application. The vulnerability exists in version 3.8.2 and allows unauthenticated remote attackers to manipulate database queries by injecting malicious SQL statements through the abs parameter in /teamcal/src/index.php. Successful exploitation enables attackers to retrieve, update, and delete all database information, potentially compromising the entire application and its underlying data.

Critical Impact

This SQL injection vulnerability allows complete database compromise including extraction of sensitive user data, modification of calendar entries, and potential deletion of all database records without authentication.

Affected Products

• TeamCal Neo version 3.8.2
• Potentially earlier versions of TeamCal Neo (unconfirmed)

Discovery Timeline

• 2025-01-31 - CVE-2025-0929 published to NVD
• 2025-01-31 - Last updated in NVD database

Technical Details for CVE-2025-0929

Vulnerability Analysis

This vulnerability is classified as CWE-89 (Improper Neutralization of Special Elements used in an SQL Command), commonly known as SQL Injection. The flaw resides in the index.php file within the TeamCal Neo source directory, specifically in how the application processes the abs parameter. When user-supplied input is passed to this parameter, it is incorporated directly into SQL queries without proper sanitization or parameterized query implementation.

The network-accessible nature of web applications combined with no authentication requirement makes this vulnerability particularly dangerous. An attacker can remotely execute arbitrary SQL commands against the backend database, potentially gaining access to all stored information including user credentials, calendar data, and system configurations.

Root Cause

The root cause of this vulnerability is improper input validation and the lack of parameterized queries or prepared statements when handling the abs parameter. The application directly concatenates user-controlled input into SQL queries, allowing attackers to break out of the intended query structure and inject their own malicious SQL commands.

Attack Vector

The attack can be executed remotely over the network without any authentication or user interaction. An attacker crafts a malicious HTTP request targeting /teamcal/src/index.php with a specially crafted abs parameter containing SQL injection payloads. These payloads can leverage techniques such as:

• UNION-based injection to extract data from other database tables
• Boolean-based blind injection to infer data through true/false responses
• Time-based blind injection using database sleep functions
• Stacked queries to execute multiple SQL statements including INSERT, UPDATE, or DELETE operations

The vulnerability allows full database manipulation including reading sensitive user credentials, modifying calendar entries, and potentially deleting entire database contents.

Detection Methods for CVE-2025-0929

Indicators of Compromise

• Unusual or malformed requests to /teamcal/src/index.php containing the abs parameter with SQL syntax
• Web server logs showing requests with SQL keywords such as UNION, SELECT, INSERT, UPDATE, DELETE, DROP, or comment sequences like -- and /*
• Database query logs containing unexpected or malformed queries originating from the TeamCal Neo application
• Unexpected changes to database records or missing data in calendar entries

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block SQL injection patterns in HTTP requests to TeamCal Neo endpoints
• Monitor web server access logs for requests containing SQL metacharacters and keywords in the abs parameter
• Deploy intrusion detection systems (IDS) with signatures for SQL injection attack patterns
• Utilize database activity monitoring to identify anomalous query patterns from the web application

Monitoring Recommendations

• Enable verbose logging on web servers hosting TeamCal Neo to capture full request parameters
• Configure database audit logging to track all queries executed against the TeamCal Neo database
• Set up alerting for failed or anomalous database queries that may indicate exploitation attempts
• Review application logs regularly for patterns consistent with automated SQL injection scanning tools

How to Mitigate CVE-2025-0929

Immediate Actions Required

• Remove or restrict access to TeamCal Neo installations from public-facing networks until a patch is applied
• Implement WAF rules to filter malicious input targeting the abs parameter in /teamcal/src/index.php
• Review database permissions and ensure the TeamCal Neo database user has minimal required privileges
• Backup all database contents and audit for any signs of data tampering or exfiltration

Patch Information

As of the publication date, vendor patch information was not available in the CVE data. Organizations should monitor the INCIBE CERT Vulnerability Notice for updates regarding official patches from the TeamCal Neo developers. Contact the vendor directly for remediation guidance.

Workarounds

• Restrict network access to the TeamCal Neo application using firewall rules to allow only trusted IP addresses
• Implement input validation at the web server or reverse proxy level to reject requests containing SQL injection patterns
• Place the application behind an authenticated proxy to prevent unauthenticated access
• Consider temporarily disabling the affected functionality if the abs parameter is not critical to operations

# Example: Apache mod_rewrite rule to block suspicious abs parameter values
# Add to .htaccess or Apache configuration
RewriteEngine On
RewriteCond %{QUERY_STRING} abs=.*(union|select|insert|update|delete|drop|--|/\*) [NC]
RewriteRule ^.*$ - [F,L]