CVE-2021-42760
📋 TL;DR
This SQL injection vulnerability in Fortinet FortiWLM allows attackers to execute arbitrary SQL commands through crafted requests, potentially exposing sensitive database information. It affects FortiWLM version 8.6.1 and earlier installations. Organizations using vulnerable versions are at risk of data breaches.
💻 Affected Systems
- Fortinet FortiWLM
📦 What is this software?
Fortiwlm by Fortinet
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise leading to exposure of all stored credentials, configuration data, network information, and potential lateral movement to connected systems.
Likely Case
Extraction of sensitive configuration data, user credentials, and network topology information from database tables.
If Mitigated
Limited information disclosure if database permissions are properly restricted and input validation is enforced at application layer.
🎯 Exploit Status
SQL injection vulnerabilities are commonly exploited with automated tools. The advisory indicates crafted requests can trigger the vulnerability.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 8.6.2 or later
Vendor Advisory: https://fortiguard.com/advisory/FG-IR-21-129
Restart Required: Yes
Instructions:
1. Download FortiWLM version 8.6.2 or later from Fortinet support portal. 2. Backup current configuration. 3. Apply the update following Fortinet's upgrade documentation. 4. Restart the FortiWLM service.
🔧 Temporary Workarounds
Network Segmentation
allRestrict access to FortiWLM management interface to trusted networks only
Web Application Firewall
allDeploy WAF with SQL injection protection rules in front of FortiWLM
🧯 If You Can't Patch
- Implement strict network access controls to limit FortiWLM management interface exposure
- Deploy database monitoring and alerting for unusual SQL query patterns
🔍 How to Verify
Check if Vulnerable:
Check FortiWLM version via web interface or CLI. If version is 8.6.1 or earlier, system is vulnerable.Check Version:
show version (CLI) or check System Information in web interfaceVerify Fix Applied:
Verify version is 8.6.2 or later and test SQL injection attempts are properly blocked.📡 Detection & Monitoring
Log Indicators:
- Unusual SQL query patterns in database logs
- Multiple failed authentication attempts followed by complex queries
- Requests with SQL syntax in parameters
Network Indicators:
- Unusual traffic patterns to FortiWLM database port
- Requests containing SQL keywords like UNION, SELECT, INSERT
SIEM Query:
source="fortiwlm" AND ("UNION" OR "SELECT" OR "INSERT" OR "DELETE") AND status=200