CVE-2024-9420
📋 TL;DR
A use-after-free vulnerability in Ivanti Connect Secure and Policy Secure allows authenticated remote attackers to execute arbitrary code on affected systems. This affects organizations using vulnerable versions of these VPN and network access control solutions. Successful exploitation could lead to complete system compromise.
💻 Affected Systems
- Ivanti Connect Secure
- Ivanti Policy Secure
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with attacker gaining root/administrative privileges, lateral movement to internal networks, data exfiltration, and persistent backdoor installation.
Likely Case
Remote code execution leading to credential theft, network reconnaissance, and deployment of additional malware or ransomware.
If Mitigated
Limited impact if strong network segmentation, least privilege access, and comprehensive monitoring are in place to contain potential breaches.
🎯 Exploit Status
Requires authenticated access but given the nature of these VPN appliances, many attackers may have valid credentials through phishing or credential stuffing.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Connect Secure 22.7R2.3 or 9.1R18.9; Policy Secure 22.7R1.2
Vendor Advisory: https://forums.ivanti.com/s/article/Security-Advisory-Ivanti-Connect-Secure-ICS-Ivanti-Policy-Secure-IPS-Ivanti-Secure-Access-Client-ISAC-Multiple-CVEs
Restart Required: Yes
Instructions:
1. Download latest firmware from Ivanti support portal. 2. Backup current configuration. 3. Apply firmware update via web admin interface. 4. Reboot appliance. 5. Verify version and functionality.
🔧 Temporary Workarounds
Restrict Access
allLimit network access to Ivanti appliances to only trusted IP ranges
Configure firewall rules to restrict access to Ivanti management interfaces
Enhanced Authentication
allImplement multi-factor authentication for all user accounts
Configure MFA in Ivanti admin console under Authentication > Multi-Factor Authentication
🧯 If You Can't Patch
- Isolate vulnerable appliances in dedicated network segments with strict firewall rules
- Implement network-based intrusion detection specifically monitoring for exploit patterns against Ivanti appliances
🔍 How to Verify
Check if Vulnerable:
Check current version in Ivanti web admin interface under System > Maintenance > Version InformationCheck Version:
ssh admin@ivanti-appliance 'cat /etc/version' or check web admin interfaceVerify Fix Applied:
Verify version shows 22.7R2.3 or higher for Connect Secure, or 22.7R1.2 or higher for Policy Secure📡 Detection & Monitoring
Log Indicators:
- Unusual authentication patterns
- Multiple failed login attempts followed by successful login
- Suspicious process execution in system logs
- Unexpected configuration changes
Network Indicators:
- Unusual outbound connections from Ivanti appliances
- Traffic patterns inconsistent with normal VPN usage
- Exploit kit signatures targeting Ivanti
SIEM Query:
source="ivanti*" AND (event_type="authentication" AND result="failure" count>10) OR (process_execution="*sh" OR process_execution="*curl*")