CVE-2021-25417
📋 TL;DR
CVE-2021-25417 is an improper authorization vulnerability in Samsung's SDP SDK that allows unauthorized access to internal storage. This affects Samsung devices running vulnerable versions of the SDP SDK prior to the June 2021 security update. Attackers can potentially access sensitive device storage without proper permissions.
💻 Affected Systems
- Samsung devices using SDP SDK
📦 What is this software?
Android by Google
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of device internal storage, allowing attackers to read, modify, or delete sensitive user data including personal files, app data, and system files.
Likely Case
Unauthorized access to app-specific storage areas, potentially exposing user data from vulnerable applications that use the SDP SDK.
If Mitigated
Limited impact with proper device isolation and application sandboxing, though some storage areas may still be accessible.
🎯 Exploit Status
Exploitation requires malicious app installation or physical access. No public exploit code available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: SMR JUN-2021 Release 1
Vendor Advisory: https://security.samsungmobile.com/securityUpdate.smsb?year=2021&month=6
Restart Required: Yes
Instructions:
1. Check for Samsung security updates in device settings. 2. Install June 2021 security update (SMR JUN-2021 Release 1). 3. Restart device after update installation.
🔧 Temporary Workarounds
Disable unknown sources
androidPrevent installation of malicious apps from unknown sources
App permission review
androidReview and restrict app permissions, especially storage access
🧯 If You Can't Patch
- Isolate affected devices from sensitive networks
- Implement mobile device management (MDM) with strict app whitelisting
🔍 How to Verify
Check if Vulnerable:
Check device security patch level in Settings > About phone > Software information. If before June 2021, device is vulnerable.Check Version:
Settings command not available. Check via Settings > About phone > Software information > Android security patch levelVerify Fix Applied:
Verify security patch level shows 'June 1, 2021' or later in device settings.📡 Detection & Monitoring
Log Indicators:
- Unusual storage access patterns from apps
- Permission bypass attempts in system logs
Network Indicators:
- Not network exploitable - primarily local device vulnerability
SIEM Query:
Not applicable - local device vulnerability