CVE-2020-21405
📋 TL;DR
This vulnerability in H96 Smart TV Box H96 Pro Plus allows attackers to corrupt files by exploiting the saveDeepColorAttr service. Attackers can potentially disrupt device functionality or cause denial of service. Users of affected H96 TV boxes are at risk.
💻 Affected Systems
- H96 Smart TV Box H96 Pro Plus
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system corruption rendering the TV box unusable, requiring hardware replacement.
Likely Case
File corruption causing application crashes, loss of settings, or partial functionality loss.
If Mitigated
Limited impact if device is isolated from untrusted networks and services are restricted.
🎯 Exploit Status
Exploitation requires network access to the device and knowledge of the vulnerable service endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
No official patch available. Check manufacturer website for firmware updates.
🔧 Temporary Workarounds
Disable vulnerable service
allDisable or block access to the saveDeepColorAttr service if possible through device settings.
Network isolation
allPlace TV box on isolated network segment without internet access or untrusted network access.
🧯 If You Can't Patch
- Disconnect device from internet and untrusted networks
- Monitor for unusual device behavior or crashes
🔍 How to Verify
Check if Vulnerable:
Check if device responds to calls to saveDeepColorAttr service endpoint. Review device logs for service access attempts.Check Version:
Check firmware version in device settings: Settings > About > Build numberVerify Fix Applied:
Test if saveDeepColorAttr service is still accessible or causing file corruption.📡 Detection & Monitoring
Log Indicators:
- Unusual access to saveDeepColorAttr service
- File corruption errors
- Service crashes
Network Indicators:
- Network traffic to TV box on unusual ports
- Requests to saveDeepColorAttr endpoint
SIEM Query:
source="tvbox" AND (event="saveDeepColorAttr" OR error="file_corruption")