CVE-2024-2647: Netentsec ASG SQL Injection Vulnerability

CVE-2024-2647 Overview

A critical SQL injection vulnerability has been identified in Netentsec NS-ASG Application Security Gateway version 6.3. The vulnerability exists in the /admin/singlelogin.php file, where improper handling of the loginId parameter allows remote attackers to inject malicious SQL commands. This flaw enables unauthenticated attackers to manipulate database queries, potentially leading to unauthorized data access, data modification, or complete system compromise.

Critical Impact

This SQL injection vulnerability allows remote unauthenticated attackers to execute arbitrary SQL commands against the backend database, potentially compromising confidentiality, integrity, and availability of the entire application security gateway infrastructure.

Affected Products

• Netentsec NS-ASG Application Security Gateway 6.3
• Netentsec Application Security Gateway (version 6.3 confirmed vulnerable)

Discovery Timeline

• 2024-03-19 - CVE-2024-2647 published to NVD
• 2025-02-10 - Last updated in NVD database

Technical Details for CVE-2024-2647

Vulnerability Analysis

This vulnerability is classified as CWE-89 (SQL Injection), a well-documented weakness category where user-controllable input is incorporated into SQL queries without proper sanitization or parameterization. In this case, the loginId parameter in the /admin/singlelogin.php file is directly concatenated into SQL statements, allowing attackers to break out of the intended query structure and execute arbitrary database commands.

The attack requires no authentication and can be initiated remotely over the network, making it particularly dangerous for internet-facing deployments. The vulnerability affects the administrative authentication mechanism, which could allow attackers to bypass authentication entirely, extract sensitive data from the database, or modify critical system configurations.

Root Cause

The root cause of this vulnerability is the failure to properly sanitize or parameterize user input in the loginId parameter before incorporating it into SQL queries. The application directly uses the untrusted input in database operations without implementing prepared statements, parameterized queries, or input validation mechanisms. This allows specially crafted input containing SQL metacharacters to alter the intended logic of database queries.

Attack Vector

The attack vector is network-based, requiring no user interaction or authentication. An attacker can craft malicious HTTP requests to the /admin/singlelogin.php endpoint with a manipulated loginId parameter containing SQL injection payloads. The vulnerable parameter accepts attacker-controlled data that is passed directly to the database engine, enabling various SQL injection techniques including UNION-based injection, boolean-based blind injection, and time-based blind injection.

A proof-of-concept demonstrating this vulnerability has been publicly disclosed. Attackers can leverage standard SQL injection techniques to extract database contents, bypass authentication mechanisms, or potentially execute operating system commands depending on database configuration and privileges. Technical details and exploitation methods are documented in the GitHub PoC Repository.

Detection Methods for CVE-2024-2647

Indicators of Compromise

• Unusual or malformed HTTP requests to /admin/singlelogin.php containing SQL syntax characters such as single quotes, double dashes, UNION statements, or encoded equivalents
• Database error messages in application logs indicating SQL syntax errors or unexpected query results
• Abnormal database query patterns or increased query execution times suggesting time-based blind injection attempts
• Unauthorized access to administrative functions or unexplained changes to database records

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect SQL injection patterns in requests targeting /admin/singlelogin.php
• Monitor HTTP access logs for requests containing SQL keywords (UNION, SELECT, OR, AND, DROP) in the loginId parameter
• Configure database audit logging to detect anomalous query patterns or unauthorized data access attempts
• Deploy intrusion detection systems with signatures for common SQL injection attack patterns

Monitoring Recommendations

• Enable detailed logging for all requests to administrative endpoints, particularly the /admin/singlelogin.php file
• Implement real-time alerting for SQL error conditions and authentication failures on the security gateway
• Monitor network traffic for suspicious patterns indicating automated SQL injection scanning or exploitation attempts
• Review database logs regularly for unauthorized access patterns or data exfiltration attempts

How to Mitigate CVE-2024-2647

Immediate Actions Required

• Restrict network access to the administrative interface (/admin/) to trusted IP addresses only using firewall rules
• Place a Web Application Firewall (WAF) in front of the NS-ASG device with SQL injection protection rules enabled
• Monitor all access to the /admin/singlelogin.php endpoint for suspicious activity
• Consider taking the administrative interface offline or disabling the single login functionality until a patch is available

Patch Information

At the time of disclosure, the vendor (Netentsec) was contacted but did not respond. No official patch has been released for this vulnerability. Organizations should contact Netentsec directly to inquire about patch availability or consider implementing compensating controls until a fix is provided. Additional details are available at VulDB #257285.

Workarounds

• Implement network segmentation to isolate the NS-ASG administrative interface from untrusted networks
• Deploy a reverse proxy or WAF with SQL injection filtering capabilities in front of the vulnerable endpoint
• Restrict access to the /admin/ directory using IP-based access control lists (ACLs) at the network level
• If possible, disable or rename the /admin/singlelogin.php file if the single sign-on functionality is not required

# Example: Restrict access to admin interface using iptables
# Only allow administrative access from trusted management network
iptables -A INPUT -p tcp --dport 443 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP

# Alternative: Use nginx as reverse proxy with SQL injection blocking
# Add to nginx location block for /admin/
location /admin/ {
    # Block common SQL injection patterns
    if ($args ~* "union.*select") { return 403; }
    if ($args ~* "concat.*\(") { return 403; }
    if ($args ~* "sleep\s*\(") { return 403; }
    proxy_pass http://backend;
}