CVE-2023-1385
📋 TL;DR
This vulnerability allows attackers to brute-force PIN codes offline due to improper JPAKE implementation where random values are initialized to known values. This enables unauthorized authentication to amzn.lightning services. It affects Amazon Fire TV Stick 3rd gen and Insignia TV with FireOS.
💻 Affected Systems
- Amazon Fire TV Stick 3rd gen
- Insignia TV with FireOS
📦 What is this software?
Fire Os by Amazon
Fire Os by Amazon
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of device allowing unauthorized access to streaming services, personal data, and potential lateral movement within home networks.
Likely Case
Unauthorized access to streaming accounts and potential credential theft from compromised devices.
If Mitigated
Limited impact if devices are isolated from sensitive networks and multi-factor authentication is used for streaming services.
🎯 Exploit Status
Exploitation requires physical access or network access to the device.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Fire TV Stick: 6.2.9.5; Insignia TV: Check for updates beyond FireOS 7.6.3.3
Vendor Advisory: https://www.bitdefender.com/blog/labs/vulnerabilities-identified-amazon-fire-tv-stick-insignia-fire-os-tv-series/
Restart Required: Yes
Instructions:
1. Navigate to Settings > My Fire TV > About > Check for Updates. 2. Install available updates. 3. Restart device.
🔧 Temporary Workarounds
Disable PIN Authentication
allTemporarily disable PIN-based authentication until patching is possible.
Network Isolation
allPlace affected devices on isolated network segments.
🧯 If You Can't Patch
- Disable the device from network access entirely
- Replace with patched hardware if available
🔍 How to Verify
Check if Vulnerable:
Check device version in Settings > My Fire TV > About > Fire TV Stick.Check Version:
No CLI command; use device settings menu.Verify Fix Applied:
Confirm version is 6.2.9.5 or higher for Fire TV Stick, or updated beyond FireOS 7.6.3.3 for Insignia TV.📡 Detection & Monitoring
Log Indicators:
- Multiple failed authentication attempts
- Unusual authentication patterns
Network Indicators:
- Unexpected authentication traffic to amzn.lightning services
SIEM Query:
Search for authentication failures or unusual patterns in device logs.