CVE-2024-47909
📋 TL;DR
A stack-based buffer overflow vulnerability in Ivanti Connect Secure and Policy Secure allows remote authenticated administrators to cause denial of service. This affects organizations using these products for VPN and policy enforcement. Attackers need admin credentials to exploit this vulnerability.
💻 Affected Systems
- Ivanti Connect Secure
- Ivanti Policy Secure
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system crash leading to extended service disruption of VPN and secure access services
Likely Case
Temporary service interruption requiring system reboot
If Mitigated
No impact if proper access controls prevent unauthorized admin access
🎯 Exploit Status
Requires admin credentials and knowledge of buffer overflow exploitation techniques
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Connect Secure 22.7R2.3 or later, Policy Secure 22.7R1.2 or later
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 the latest patch from Ivanti support portal. 2. Backup current configuration. 3. Apply patch following Ivanti documentation. 4. Reboot the appliance. 5. Verify service restoration.
🔧 Temporary Workarounds
Restrict Admin Access
allLimit administrative access to trusted IP addresses and networks only
Configure firewall rules to restrict admin interface access
Multi-factor Authentication
allEnable MFA for all administrative accounts
Configure MFA in Ivanti admin console
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Ivanti appliances
- Monitor for unusual admin login attempts and buffer overflow patterns
🔍 How to Verify
Check if Vulnerable:
Check current version in Ivanti admin interface under System > Maintenance > VersionCheck Version:
ssh admin@ivanti-appliance 'show version' or check web admin interfaceVerify Fix Applied:
Verify version shows 22.7R2.3 or later for Connect Secure, 22.7R1.2 or later for Policy Secure📡 Detection & Monitoring
Log Indicators:
- Multiple failed admin login attempts
- System crash/restart logs
- Buffer overflow error messages
Network Indicators:
- Unusual admin interface traffic patterns
- Multiple connection attempts to admin ports
SIEM Query:
source="ivanti*" AND (event_type="authentication_failure" OR event_type="system_crash")