CVE-2023-49954: 3CX CRM Integration SQLi Vulnerability

CVE-2023-49954 Overview

CVE-2023-49954 is a critical SQL Injection vulnerability affecting the CRM Integration component in 3CX communication software. The vulnerability exists in versions before 18.0.9.23 and version 20 before 20.0.0.1494, allowing attackers to inject malicious SQL commands through user-controllable input fields including first name, search string, or email address parameters.

Critical Impact

This SQL Injection vulnerability enables unauthenticated remote attackers to execute arbitrary SQL commands against the underlying database, potentially leading to complete data exfiltration, unauthorized data modification, or full system compromise.

Affected Products

• 3CX versions prior to 18.0.9.23
• 3CX version 20 prior to 20.0.0.1494
• 3CX CRM Integration module

Discovery Timeline

• 2023-12-25 - CVE-2023-49954 published to NVD
• 2025-04-23 - Last updated in NVD database

Technical Details for CVE-2023-49954

Vulnerability Analysis

This SQL Injection vulnerability (CWE-89: Improper Neutralization of Special Elements used in an SQL Command) affects the CRM Integration functionality within 3CX. The vulnerability allows attackers to inject malicious SQL statements through several user-controllable input vectors without requiring authentication or user interaction.

The attack can be executed remotely over the network with low complexity. Successful exploitation could result in complete compromise of confidentiality, integrity, and availability of the affected system. Attackers may extract sensitive customer data stored in the CRM, modify records, escalate privileges within the database, or potentially achieve remote code execution depending on the database configuration and permissions.

Root Cause

The root cause of CVE-2023-49954 is inadequate input validation and sanitization in the CRM Integration module. User-supplied data from first name fields, search strings, and email address inputs are directly incorporated into SQL queries without proper parameterization or escaping. This allows specially crafted input containing SQL metacharacters to break out of the intended query context and execute attacker-controlled SQL statements.

Attack Vector

The attack vector is network-based, targeting the CRM Integration endpoints in 3CX. An attacker can exploit this vulnerability by submitting maliciously crafted input through:

1. First Name Field: Injecting SQL payloads in contact or user first name inputs
2. Search String: Exploiting CRM search functionality with SQL injection payloads
3. Email Address Field: Submitting malformed email addresses containing SQL commands

The vulnerability manifests when user input is concatenated directly into SQL queries. For example, a malicious search string like ' OR '1'='1' -- or more sophisticated payloads such as '; DROP TABLE contacts; -- could be used to manipulate query logic, extract data via UNION-based injection, or perform destructive operations. Technical details and proof-of-concept information can be found at the GitHub CVE-2023-49954 Resource.

Detection Methods for CVE-2023-49954

Indicators of Compromise

• Unusual SQL error messages appearing in application logs related to CRM Integration functionality
• Database logs showing unexpected queries containing SQL metacharacters (single quotes, semicolons, UNION statements, comment sequences)
• Anomalous database query patterns targeting CRM-related tables with unusual WHERE clause conditions
• Suspicious input values in web server access logs containing SQL injection payloads in first name, search, or email parameters

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block common SQL injection patterns in HTTP requests to 3CX CRM endpoints
• Implement database activity monitoring to identify anomalous query patterns, unauthorized data access, or privilege escalation attempts
• Configure SIEM rules to correlate web application logs with database logs for detecting SQL injection attack chains
• Monitor for application errors related to SQL syntax in CRM Integration module logs

Monitoring Recommendations

• Enable verbose logging on the 3CX application and associated database systems
• Configure real-time alerting for SQL error patterns and injection attempt signatures
• Implement network-level monitoring for suspicious traffic patterns targeting CRM Integration endpoints
• Establish baseline database query patterns to identify deviations indicative of SQL injection exploitation

How to Mitigate CVE-2023-49954

Immediate Actions Required

• Upgrade 3CX to version 18.0.9.23 or later for the version 18 branch
• Upgrade 3CX to version 20.0.0.1494 or later for the version 20 branch
• Audit database logs for signs of prior exploitation attempts or data exfiltration
• Review and rotate database credentials if exploitation is suspected
• Implement network segmentation to limit database exposure

Patch Information

3CX has released security patches addressing this SQL Injection vulnerability. Organizations running affected versions should upgrade to 18.0.9.23 or later (for version 18) or 20.0.0.1494 or later (for version 20). Consult the GitHub CVE-2023-49954 Resource for additional technical information and patch verification details.

Workarounds

• Deploy a Web Application Firewall (WAF) with SQL injection detection rules in front of the 3CX application as a temporary protective measure
• Restrict network access to CRM Integration endpoints to trusted IP ranges only
• Implement strict input validation at the network perimeter for requests containing SQL metacharacters
• Consider temporarily disabling CRM Integration functionality if not business-critical until patches can be applied

# Example WAF rule to block common SQL injection patterns (ModSecurity)
SecRule ARGS "@rx (?i)(\b(union|select|insert|update|delete|drop|alter)\b.*\b(from|into|table|database)\b)" \
    "id:1001,phase:2,deny,status:403,log,msg:'SQL Injection Attempt Detected'"