CVE-2021-25485
📋 TL;DR
This path traversal vulnerability in Samsung's FactoryAirCommandManager allows attackers to write files with system-level privileges via Bluetooth remote socket. It affects Samsung mobile devices before the October 2021 security update. Attackers could potentially modify system files or install malicious components.
💻 Affected Systems
- Samsung mobile devices with FactoryAirCommandManager
📦 What is this software?
Android by Google
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing persistent malware installation, data theft, or device bricking via system file modification.
Likely Case
Local privilege escalation leading to unauthorized system access, data exfiltration, or installation of surveillance tools.
If Mitigated
Limited impact with proper Bluetooth security controls and network segmentation in place.
🎯 Exploit Status
Requires Bluetooth access and knowledge of the vulnerable component. No public exploit code has been released.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: SMR Oct-2021 Release 1 or later
Vendor Advisory: https://security.samsungmobile.com/securityUpdate.smsb?year=2021&month=10
Restart Required: Yes
Instructions:
1. Check for system updates in device settings. 2. Install October 2021 security update or later. 3. Reboot device after installation.
🔧 Temporary Workarounds
Disable Bluetooth when not in use
allTurn off Bluetooth to prevent remote exploitation via Bluetooth socket
Restrict Bluetooth visibility
allSet Bluetooth to non-discoverable mode to reduce attack surface
🧯 If You Can't Patch
- Disable Bluetooth completely in device settings
- Implement network segmentation to isolate vulnerable devices from critical systems
🔍 How to Verify
Check if Vulnerable:
Check Android security patch level in Settings > About phone > Software information. If patch level is earlier than October 2021, device is vulnerable.Check Version:
Not applicable - check via device settings UIVerify Fix Applied:
Confirm security patch level shows October 2021 or later in device settings.📡 Detection & Monitoring
Log Indicators:
- Unusual Bluetooth connection attempts to FactoryAirCommandManager
- Unexpected file write operations in system directories
Network Indicators:
- Suspicious Bluetooth pairing requests from unknown devices
- Unusual Bluetooth traffic patterns
SIEM Query:
Not applicable for typical mobile device deployments