CVE-2024-28521
📋 TL;DR
A SQL injection vulnerability in Netcome NS-ASG Application Security Gateway version 6.3.1 allows local attackers to execute arbitrary SQL commands via the loginid parameter in singlelogin.php. This can lead to unauthorized data access, authentication bypass, or system compromise. Only organizations using this specific gateway version are affected.
💻 Affected Systems
- Netcome NS-ASG Application Security Gateway
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with administrative access, sensitive data exfiltration, and potential lateral movement within the network.
Likely Case
Authentication bypass leading to unauthorized access to the gateway's administrative interface and configuration data exposure.
If Mitigated
Limited impact with proper input validation and database permissions restricting damage to non-critical data.
🎯 Exploit Status
Exploitation requires network access to the gateway interface but no authentication. SQL injection in authentication endpoints is commonly weaponized.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
1. Contact Netcome vendor for patch information. 2. If patch available, download from vendor portal. 3. Apply patch following vendor instructions. 4. Verify fix by testing the vulnerable endpoint.
🔧 Temporary Workarounds
Input Validation Filter
allImplement input validation for loginid parameter to reject SQL special characters
Not applicable - requires code modification
Web Application Firewall Rule
allBlock SQL injection patterns targeting singlelogin.php endpoint
WAF-specific configuration required
🧯 If You Can't Patch
- Isolate the NS-ASG gateway from untrusted networks using firewall rules
- Implement network segmentation to limit potential lateral movement if compromised
🔍 How to Verify
Check if Vulnerable:
Test the /singlelogin.php endpoint with SQL injection payloads in loginid parameter and observe database errors or unexpected behaviorCheck Version:
Check gateway web interface admin panel or system information page for version numberVerify Fix Applied:
Retest with SQL injection payloads after remediation - should receive proper error messages or rejection without database interaction📡 Detection & Monitoring
Log Indicators:
- Unusual SQL error messages in application logs
- Multiple failed login attempts with SQL special characters
- Unexpected database queries from web application
Network Indicators:
- HTTP requests to /singlelogin.php containing SQL keywords (SELECT, UNION, etc.)
- Unusual traffic patterns to authentication endpoints
SIEM Query:
source="web_logs" AND uri="/singlelogin.php" AND (loginid CONTAINS "'" OR loginid CONTAINS "--" OR loginid CONTAINS "SELECT" OR loginid CONTAINS "UNION")