CVE-2019-20471
📋 TL;DR
The TK-Star Q90 Junior GPS smartwatch uses a hardcoded default administrative password (123456) that cannot be changed during initial setup. This allows attackers to gain administrative access to the device. All users of this specific smartwatch model are affected.
💻 Affected Systems
- TK-Star Q90 Junior GPS smartwatch
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing location tracking, data theft, and potential use as an attack vector when combined with CVE-2019-20470.
Likely Case
Unauthorized administrative access to the smartwatch, enabling data extraction and device manipulation.
If Mitigated
Limited impact if device is isolated from networks and physical access is controlled.
🎯 Exploit Status
Exploitation requires knowledge of the default password (123456) and network access to the device. Combined exploitation with CVE-2019-20470 increases impact.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.tk-star.com
Restart Required: No
Instructions:
No official patch available. Contact vendor for firmware updates or replacement options.
🔧 Temporary Workarounds
Disable network connectivity
allPrevent remote exploitation by disabling Wi-Fi and cellular data connections
Manual device settings configuration
Physical isolation
allKeep device in Faraday bag or disconnected when not in use
🧯 If You Can't Patch
- Discontinue use of the device immediately
- Replace with a different model from a vendor with better security practices
🔍 How to Verify
Check if Vulnerable:
Check device firmware version in settings. If version is 3.1042.9.8656, device is vulnerable.Check Version:
Navigate to device Settings > About > Firmware VersionVerify Fix Applied:
No fix available to verify. Consider device replacement.📡 Detection & Monitoring
Log Indicators:
- Failed authentication attempts followed by successful login with default credentials
- Unusual administrative access patterns
Network Indicators:
- Unexpected administrative connections to device management ports
- Traffic patterns indicating device compromise
SIEM Query:
Authentication events with username 'admin' and password '123456' OR default credential usage patterns