CVE-2025-20912
📋 TL;DR
An incorrect default permission vulnerability in DiagMonAgent on Samsung Galaxy Watch devices allows local attackers to access sensitive data. This affects Galaxy Watch devices running vulnerable versions of the DiagMonAgent component prior to the March 2025 security update. Attackers must have local access to the device to exploit this vulnerability.
💻 Affected Systems
- Samsung Galaxy Watch
📦 What is this software?
Wear Os by Samsung
⚠️ Risk & Real-World Impact
Worst Case
Local attackers could access sensitive user data stored on the Galaxy Watch, potentially including health information, messages, authentication tokens, or other personal data.
Likely Case
Malicious apps or users with physical access could read data they shouldn't have permission to access, potentially exposing personal information.
If Mitigated
With proper access controls and the security patch applied, the vulnerability is eliminated and data remains protected according to intended permissions.
🎯 Exploit Status
Exploitation requires local access to the device. No public exploit code has been identified at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: SMR Mar-2025 Release 1
Vendor Advisory: https://security.samsungmobile.com/securityUpdate.smsb?year=2025&month=03
Restart Required: Yes
Instructions:
1. Open Galaxy Wearable app on your paired smartphone. 2. Go to Watch settings > About watch > Software update. 3. Check for and install the March 2025 security update. 4. Restart the watch after installation completes.
🔧 Temporary Workarounds
Disable Developer Options
allDisable developer options and ADB debugging to reduce attack surface
Settings > Developer options > Turn off
Restrict Physical Access
allEnsure Galaxy Watch devices are physically secured and not left unattended
🧯 If You Can't Patch
- Restrict physical access to Galaxy Watch devices
- Implement device management policies to monitor for suspicious activity
🔍 How to Verify
Check if Vulnerable:
Check if your Galaxy Watch has received the March 2025 security update: Settings > About watch > Software information > Security software versionCheck Version:
Settings > About watch > Software information > Security software versionVerify Fix Applied:
Verify the security patch level shows 'March 1, 2025' or later in Settings > About watch > Software information📡 Detection & Monitoring
Log Indicators:
- Unusual access patterns to DiagMonAgent component
- Permission violation logs in system logs
Network Indicators:
- Unusual ADB or debugging connections to the watch
SIEM Query:
Not applicable - this is a local device vulnerability