CVE-2022-46764: TrueConf Server SQLi Vulnerability

CVE-2022-46764 Overview

CVE-2022-46764 is a SQL injection vulnerability in the web API of TrueConf Server 5.2.0.10225. This vulnerability allows remote unauthenticated attackers to execute arbitrary SQL commands against the backend database. The exploitation chain can be escalated to achieve remote code execution on the underlying server, making this a severe security concern for organizations running vulnerable versions of this video conferencing platform.

Critical Impact

Unauthenticated attackers can exploit this SQL injection vulnerability to execute arbitrary SQL commands and ultimately achieve remote code execution on affected TrueConf Server installations.

Affected Products

• TrueConf Server versions prior to 5.2.6 (fixed version)
• TrueConf Server 5.2.0.10225 (confirmed vulnerable)
• Microsoft Windows (as the underlying operating system platform)

Discovery Timeline

• 2022-12-27 - CVE-2022-46764 published to NVD
• 2026-01-21 - Last updated in NVD database

Technical Details for CVE-2022-46764

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 exists within the web API component of TrueConf Server, which fails to properly sanitize user-supplied input before incorporating it into SQL queries.

The vulnerability is particularly dangerous because it requires no authentication to exploit. An attacker with network access to the TrueConf Server web API can craft malicious requests containing SQL injection payloads. Once successful SQL injection is achieved, the attacker can extract sensitive data from the database, modify or delete records, and potentially leverage database functionality to execute operating system commands, leading to full remote code execution.

The exploitation path from SQL injection to remote code execution typically involves leveraging database-specific features such as xp_cmdshell on SQL Server or INTO OUTFILE on MySQL to write webshells or execute system commands directly.

Root Cause

The root cause of this vulnerability is insufficient input validation and sanitization in the TrueConf Server web API. User-controlled input is concatenated directly into SQL query strings without proper parameterization or escaping. This allows attackers to break out of the intended query context and inject their own SQL statements.

The lack of prepared statements or parameterized queries in the affected code path enables attackers to manipulate the query logic, bypass authentication checks, and access or modify database contents beyond what the application intended to expose.

Attack Vector

The attack vector is network-based, requiring the attacker to have network connectivity to the TrueConf Server web API endpoint. The attack can be executed remotely without any prior authentication, making it accessible to any attacker who can reach the vulnerable API.

The exploitation flow involves sending specially crafted HTTP requests to the vulnerable API endpoint with SQL injection payloads embedded in request parameters. The vulnerability can be exploited through standard penetration testing techniques using tools like sqlmap to automate the injection and data extraction process. Once database access is established, the attacker can escalate to remote code execution through database-specific command execution features.

For detailed technical information about exploitation techniques, refer to the GitHub CVE Submission and the SolidLab News Article.

Detection Methods for CVE-2022-46764

Indicators of Compromise

• Unusual SQL syntax or keywords appearing in web server access logs (e.g., UNION SELECT, OR 1=1, xp_cmdshell)
• Error messages in application logs indicating SQL syntax errors from malformed injection attempts
• Unexpected database queries or stored procedure executions in database audit logs
• Creation of new database users, files, or unauthorized data modifications
• Web shells or unexpected files appearing in the web server directories

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block common SQL injection patterns in HTTP requests
• Enable verbose logging on the TrueConf Server web API and monitor for anomalous request patterns
• Configure database auditing to track unusual query patterns, especially those involving system procedures or bulk data extraction
• Deploy network intrusion detection systems with signatures for SQL injection attack patterns

Monitoring Recommendations

• Establish baseline metrics for API request patterns and alert on deviations indicating potential exploitation attempts
• Monitor database server CPU and I/O metrics for anomalies that may indicate data exfiltration or command execution
• Implement real-time alerting for security events related to the TrueConf Server application and associated database
• Regularly review access logs for the TrueConf Server management interfaces and API endpoints

How to Mitigate CVE-2022-46764

Immediate Actions Required

• Upgrade TrueConf Server to version 5.2.6 or later immediately to remediate the vulnerability
• If immediate patching is not possible, restrict network access to the TrueConf Server web API using firewall rules
• Implement a Web Application Firewall with SQL injection protection rules in front of the TrueConf Server
• Review database and system logs for any indicators of prior exploitation
• Consider isolating the TrueConf Server from critical network segments until patching is complete

Patch Information

TrueConf has addressed this vulnerability in TrueConf Server version 5.2.6. Organizations running affected versions should upgrade to this version or later as soon as possible. The patch implements proper input validation and parameterized queries to prevent SQL injection attacks through the web API.

For additional technical details, consult the VulDB entry #216845 which tracks changes and patch information for this vulnerability.

Workarounds

• Deploy a reverse proxy or WAF with SQL injection filtering capabilities in front of the TrueConf Server
• Restrict access to the TrueConf Server web API to trusted IP ranges only using network-level access controls
• Disable or restrict external access to the vulnerable API endpoints if they are not required for operations
• Implement network segmentation to limit the blast radius if exploitation occurs
• Enable database-level controls to restrict the privileges of the application database account

# Example firewall rule to restrict API access (iptables)
# Allow only trusted management network to access TrueConf Server API
iptables -A INPUT -p tcp --dport 443 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP