CVE-2024-6107
📋 TL;DR
This authentication bypass vulnerability in MAAS allows attackers to execute unauthorized RPC commands without proper credentials. Systems running vulnerable versions of MAAS are affected, potentially enabling complete system compromise. The vulnerability stems from insufficient verification of client authentication.
💻 Affected Systems
- MAAS (Metal as a Service)
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of MAAS-managed infrastructure, allowing attacker to provision/control servers, access sensitive data, and pivot to other systems.
Likely Case
Unauthorized access to MAAS functionality, enabling attacker to deploy malicious systems, modify configurations, or exfiltrate sensitive infrastructure data.
If Mitigated
Limited impact if network segmentation restricts MAAS access and strong authentication controls are in place.
🎯 Exploit Status
Authentication bypass vulnerabilities are frequently weaponized due to their simplicity and high impact.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Latest MAAS snap updates addressing the vulnerability
Vendor Advisory: https://bugs.launchpad.net/maas/+bug/2069094
Restart Required: Yes
Instructions:
1. Update MAAS snap: 'sudo snap refresh maas' 2. Restart MAAS services: 'sudo systemctl restart snap.maas.*' 3. Verify update with 'snap info maas'
🔧 Temporary Workarounds
Network Isolation
linuxRestrict network access to MAAS API endpoints
sudo ufw deny from any to <maas-ip> port 5240
sudo iptables -A INPUT -p tcp --dport 5240 -j DROP
API Access Restriction
linuxLimit MAAS API access to trusted IPs only
Edit MAAS configuration to restrict API endpoints to internal network
🧯 If You Can't Patch
- Implement strict network segmentation to isolate MAAS from untrusted networks
- Deploy additional authentication layer (reverse proxy with auth) in front of MAAS API
🔍 How to Verify
Check if Vulnerable:
Check MAAS version: 'snap info maas | grep installed' and compare with patched versions in advisoryCheck Version:
snap info maas | grep installedVerify Fix Applied:
Verify updated version and test authentication requirements for RPC commands📡 Detection & Monitoring
Log Indicators:
- Unauthorized RPC command attempts
- Authentication failures followed by successful RPC commands
- Unusual API access patterns
Network Indicators:
- RPC traffic from unauthorized sources
- Unusual volume of API requests to MAAS endpoints
SIEM Query:
source="maas.log" AND ("authentication failure" OR "unauthorized access") AND "RPC command"