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Another great post from watchTowr about the recent vulnerability affecting Ivanti Connect Secure. Although exploitation appears complex (only digits and dots authorized in the payload), the vulnerability is actively being exploited in the wild.
Reference:
You Should Know: Detecting and Mitigating the Vulnerability
1. Vulnerability Detection
To check if your Ivanti appliance is vulnerable, use the following curl command:
curl -k "https://<TARGET_IP>/api/v1/totp/user-backup-code/../../license/keys-status/"
If the system is vulnerable, it may return sensitive license key information.
2. Exploit Mitigation Steps
- Patch Immediately: Apply the latest Ivanti security updates.
- Network Segmentation: Restrict access to Ivanti Connect Secure interfaces.
- Log Monitoring: Check for unusual API requests in logs:
grep -r "user-backup-code" /var/log/ivanti/
3. Post-Exploitation Checks
If compromised, inspect running processes for suspicious activity:
ps aux | grep -E '(wget|curl|bash|sh|python|perl)'
Check for unexpected network connections:
netstat -tulnp | grep -vE '(127.0.0.1|::1)'
4. Hardening Commands
- Disable Unused Services:
systemctl disable unnecessary-service
- Enable WAF Rules:
iptables -A INPUT -p tcp --dport 443 -m string --string "user-backup-code" --algo bm -j DROP
What Undercode Say
This Ivanti flaw highlights the risks of improper path validation in web APIs. Security teams must:
– Monitor API endpoints for directory traversal attempts.
– Use strict input validation (e.g., regex for allowed chars).
– Automate patch deployment with tools like Ansible:
ansible all -m apt -a "name=ivanti-connect-secure state=latest"
– Conduct red-team exercises simulating exploitation:
nmap -p 443 --script http-vuln-ivanti <TARGET_IP>
Expected Output: A secure, patched Ivanti environment with no exposed API vulnerabilities.
References:
Reported By: Gregorydraperi Another – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
