CVE-2013-6276
📋 TL;DR
This vulnerability involves hardcoded SSH keys in QNAP F_VioCard 2312 and F_VioGate 2308 devices, allowing unauthorized remote access. Only legacy models that reached end-of-life in 2010 are affected, as active models use different authorization mechanisms.
💻 Affected Systems
- QNAP F_VioCard 2312
- QNAP F_VioGate 2308
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise via SSH root access, enabling data theft, ransomware deployment, or device takeover as part of a botnet.
Likely Case
Unauthorized access to sensitive data and potential lateral movement within the network if devices are still deployed.
If Mitigated
No impact if devices are properly decommissioned or isolated, as they should have been replaced years ago.
🎯 Exploit Status
Exploitation requires only SSH client and knowledge of hardcoded keys. Public details available in referenced advisories.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: N/A
Vendor Advisory: N/A
Restart Required: No
Instructions:
No official patch available. Devices reached end-of-life in 2010 and should be decommissioned.
🔧 Temporary Workarounds
Remove hardcoded SSH keys
linuxManually remove hardcoded entries from authorized_keys files
ssh user@device 'rm ~/.ssh/authorized_keys'
ssh user@device 'chmod 600 ~/.ssh/authorized_keys'
Disable SSH service
linuxTurn off SSH service if not required
ssh user@device 'service ssh stop'
ssh user@device 'chkconfig ssh off'
🧯 If You Can't Patch
- Immediately decommission all affected devices as they are 10+ years past EOL
- Isolate devices on separate VLAN with strict firewall rules if temporary operation is absolutely necessary
🔍 How to Verify
Check if Vulnerable:
Check if device model is F_VioCard 2312 or F_VioGate 2308, then attempt SSH login with known hardcoded keysCheck Version:
ssh user@device 'cat /etc/version' or check device model labelVerify Fix Applied:
Verify authorized_keys file is empty or contains only authorized keys, and SSH service is disabled or properly secured📡 Detection & Monitoring
Log Indicators:
- SSH login attempts using hardcoded keys
- Unauthorized SSH sessions from unexpected sources
Network Indicators:
- SSH traffic to/from legacy QNAP devices
- Unexpected SSH port scanning
SIEM Query:
source="ssh" AND (device_model="F_VioCard 2312" OR device_model="F_VioGate 2308")