CVE-2025-49489
📋 TL;DR
This CVE describes an improper resource shutdown vulnerability in ASR Falcon_Linux, Kestrel, and Lapwing_Linux products on Linux systems. It allows resource leak exposure through the con_mgr/dialer_task.C component, potentially leading to denial of service. Organizations using these products before version 1536 are affected.
💻 Affected Systems
- Falcon_Linux
- Kestrel
- Lapwing_Linux
📦 What is this software?
Falcon Linux by Asrmicro
Kestrel by Asrmicro
Lapwing Linux by Asrmicro
⚠️ Risk & Real-World Impact
Worst Case
Sustained exploitation could exhaust system resources (memory/file descriptors), causing service degradation or complete denial of service for affected components.
Likely Case
Gradual resource depletion over time leading to performance degradation and potential service instability requiring restarts.
If Mitigated
Minimal impact with proper monitoring and resource limits in place, though periodic restarts may still be needed.
🎯 Exploit Status
Exploitation requires triggering the resource leak condition repeatedly. No public exploit details available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v1536
Vendor Advisory: https://www.asrmicro.com/en/goods/psirt?cid=40
Restart Required: Yes
Instructions:
1. Download v1536 or later from ASR vendor portal. 2. Backup current configuration. 3. Install updated version following vendor documentation. 4. Restart affected services or system.
🔧 Temporary Workarounds
Resource Monitoring and Restart
linuxImplement monitoring for resource usage and schedule periodic restarts before exhaustion occurs.
# Monitor file descriptors: lsof | wc -l
# Monitor memory usage: free -h
# Set up cron job for periodic restart if thresholds exceeded
🧯 If You Can't Patch
- Implement strict resource limits (ulimit) for affected processes to contain potential leaks.
- Isolate affected systems from untrusted networks and implement aggressive monitoring for resource exhaustion patterns.
🔍 How to Verify
Check if Vulnerable:
Check product version: grep -i version /path/to/product/logs or check vendor documentation for version command.Check Version:
Consult vendor documentation for specific version check command for each product.Verify Fix Applied:
Verify version is v1536 or later and monitor system resources for abnormal consumption patterns.📡 Detection & Monitoring
Log Indicators:
- Increasing memory usage patterns
- File descriptor exhaustion warnings
- Process restart logs
- Resource allocation failures
Network Indicators:
- Unusual connection patterns to con_mgr services
- Service degradation or timeouts
SIEM Query:
source="*asr*" AND ("resource exhausted" OR "out of memory" OR "too many open files")