CVE-2023-40458
📋 TL;DR
This CVE describes an infinite loop vulnerability in Sierra Wireless ALEOS ACEManager that allows remote attackers to cause a denial-of-service condition. The DoS affects only the ACEManager service while other router functions continue operating normally. Organizations using affected Sierra Wireless routers with ACEManager enabled are vulnerable.
💻 Affected Systems
- Sierra Wireless ALEOS
📦 What is this software?
Aleos by Sierrawireless
Aleos by Sierrawireless
⚠️ Risk & Real-World Impact
Worst Case
Remote attacker causes persistent ACEManager service outage requiring device restart, disrupting management capabilities while data plane continues functioning.
Likely Case
Targeted attacks against ACEManager service causing temporary management unavailability until device is manually restarted.
If Mitigated
Limited impact with proper network segmentation and access controls preventing unauthorized access to ACEManager interfaces.
🎯 Exploit Status
Remote exploitation possible; complexity appears low based on vulnerability description
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Consult Sierra Wireless advisory SWI-PSA-2023-006 for specific patched versions
Vendor Advisory: https://source.sierrawireless.com/resources/security-bulletins/sierra-wireless-technical-bulletin---swi-psa-2023-006/
Restart Required: Yes
Instructions:
1. Review Sierra Wireless advisory SWI-PSA-2023-006 2. Download appropriate firmware update 3. Apply update following vendor instructions 4. Restart device to complete installation
🔧 Temporary Workarounds
Network segmentation
allRestrict access to ACEManager interface to trusted management networks only
Access control lists
allImplement firewall rules to limit connections to ACEManager service
🧯 If You Can't Patch
- Implement strict network access controls to ACEManager interface
- Monitor for ACEManager service restarts and implement alerting
🔍 How to Verify
Check if Vulnerable:
Check device firmware version against Sierra Wireless advisory SWI-PSA-2023-006Check Version:
Device-specific; typically via web interface or CLI command 'show version'Verify Fix Applied:
Verify firmware version matches patched version specified in vendor advisory📡 Detection & Monitoring
Log Indicators:
- ACEManager service crashes
- Unexpected ACEManager restarts
- High CPU usage on ACEManager process
Network Indicators:
- Multiple connection attempts to ACEManager port
- Unusual traffic patterns to management interface
SIEM Query:
source="router_logs" AND ("ACEManager restart" OR "ACEManager crash" OR "infinite loop")