CVE-2025-20952
📋 TL;DR
This vulnerability in Mdecservice allows local attackers to bypass access controls and read arbitrary files with system-level privileges. It affects Samsung mobile devices running vulnerable versions of the Mdecservice component prior to the April 2025 security update. Attackers must have local access to the device to exploit this flaw.
💻 Affected Systems
- Samsung mobile devices with Mdecservice component
📦 What is this software?
Android by Samsung
Android is Google's open-source mobile operating system powering over 3 billion devices worldwide, including smartphones, tablets, smart TVs, automotive systems, wearables, and IoT devices. As the world's dominant mobile OS with approximately 72% global market share, Android serves as the foundation...
Learn more about Android →Android by Samsung
Android is Google's open-source mobile operating system powering over 3 billion devices worldwide, including smartphones, tablets, smart TVs, automotive systems, wearables, and IoT devices. As the world's dominant mobile OS with approximately 72% global market share, Android serves as the foundation...
Learn more about Android →Android by Samsung
Android is Google's open-source mobile operating system powering over 3 billion devices worldwide, including smartphones, tablets, smart TVs, automotive systems, wearables, and IoT devices. As the world's dominant mobile OS with approximately 72% global market share, Android serves as the foundation...
Learn more about Android →⚠️ Risk & Real-World Impact
Worst Case
An attacker with local access could read sensitive system files, configuration data, or user data stored on the device, potentially leading to credential theft, data exfiltration, or further privilege escalation.
Likely Case
Malicious apps or users with physical access could read protected files containing sensitive information such as authentication tokens, configuration files, or personal data.
If Mitigated
With proper access controls and the patch applied, attackers would be restricted to their designated file access permissions as intended by the system.
🎯 Exploit Status
Exploitation requires local access to the device, either through a malicious app or physical access.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: SMR Apr-2025 Release 1
Vendor Advisory: https://security.samsungmobile.com/securityUpdate.smsb?year=2025&month=04
Restart Required: Yes
Instructions:
1. Navigate to Settings > Software update on your Samsung device. 2. Check for and install the April 2025 security update. 3. Restart the device after installation completes.
🔧 Temporary Workarounds
Restrict physical access
allLimit physical access to devices to prevent local exploitation
App installation controls
allRestrict installation of unknown apps to prevent malicious applications from exploiting the vulnerability
🧯 If You Can't Patch
- Implement strict mobile device management policies to control app installations
- Enable full device encryption and strong authentication to limit impact if exploited
🔍 How to Verify
Check if Vulnerable:
Check if your device has received the April 2025 security update by going to Settings > About phone > Software information > Security patch levelCheck Version:
Not applicable - check via device settings UI as described aboveVerify Fix Applied:
Verify the security patch level shows 'April 1, 2025' or later in Settings > About phone > Software information📡 Detection & Monitoring
Log Indicators:
- Unusual file access patterns by Mdecservice process
- Access attempts to protected system directories
Network Indicators:
- Not applicable - this is a local file access vulnerability
SIEM Query:
Not applicable for typical mobile device environments