CVE-2022-21822
📋 TL;DR
CVE-2022-21822 is a resource exhaustion vulnerability in NVIDIA FLARE's admin interface that allows unauthenticated attackers to cause denial of service by overwhelming system resources. This affects all NVIDIA FLARE deployments with the admin interface exposed. The vulnerability can render the system unavailable to legitimate users.
💻 Affected Systems
- NVIDIA FLARE
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system unavailability due to resource exhaustion, disrupting all FLARE operations and potentially affecting dependent federated learning workflows.
Likely Case
Temporary service degradation or denial of service affecting admin interface functionality and potentially impacting federated learning job execution.
If Mitigated
Minimal impact with proper network segmentation and access controls limiting exposure to the admin interface.
🎯 Exploit Status
The vulnerability requires no authentication and involves simple resource exhaustion techniques that are easy to implement.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.0.16 and later
Vendor Advisory: https://github.com/NVIDIA/NVFlare/security/advisories/GHSA-jx8f-cpx7-fv47
Restart Required: Yes
Instructions:
1. Backup current configuration and data. 2. Stop NVIDIA FLARE services. 3. Upgrade to version 2.0.16 or later using pip: 'pip install nvflare>=2.0.16'. 4. Restart NVIDIA FLARE services. 5. Verify the admin interface is functioning properly.
🔧 Temporary Workarounds
Network Access Restriction
linuxRestrict network access to the admin interface using firewall rules to only allow trusted IP addresses.
iptables -A INPUT -p tcp --dport [admin_port] -s [trusted_ip] -j ACCEPT
iptables -A INPUT -p tcp --dport [admin_port] -j DROP
Disable Admin Interface
allTemporarily disable the admin interface if not required for operations.
Modify configuration to set 'admin_enabled: false' in server configuration
🧯 If You Can't Patch
- Implement strict network segmentation and firewall rules to limit access to the admin interface only from trusted management networks.
- Deploy rate limiting or web application firewall (WAF) in front of the admin interface to prevent resource exhaustion attacks.
🔍 How to Verify
Check if Vulnerable:
Check NVIDIA FLARE version: 'pip show nvflare' or examine version in logs. If version is below 2.0.16 and admin interface is enabled, the system is vulnerable.Check Version:
pip show nvflare | grep VersionVerify Fix Applied:
Verify version is 2.0.16 or higher: 'pip show nvflare | grep Version'. Test admin interface functionality remains available under normal load.📡 Detection & Monitoring
Log Indicators:
- Unusual high volume of requests to admin interface endpoints
- Resource exhaustion warnings in system logs
- Admin interface becoming unresponsive
Network Indicators:
- High volume of requests to admin port from single or multiple sources
- Unusual traffic patterns to admin interface
SIEM Query:
source="nvflare.logs" AND ("resource exhaustion" OR "admin interface" AND "high load")