CVE-2025-21078
📋 TL;DR
This vulnerability in Samsung Smart Switch allows attackers on the same network to access application backup data due to insufficient randomness in secret key generation. It affects Smart Switch users with versions below 3.7.68.6, potentially exposing sensitive application data to local network attackers.
💻 Affected Systems
- Samsung Smart Switch
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could access and exfiltrate sensitive application backup data including credentials, personal information, and application state data from vulnerable devices on the same network.
Likely Case
Local network attackers accessing application backup files containing potentially sensitive but non-critical application data.
If Mitigated
With proper network segmentation and access controls, impact is limited to authorized users only accessing their own backup data.
🎯 Exploit Status
Exploitation requires adjacent network access but no authentication. Attack complexity is low once on the same network segment.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.7.68.6
Vendor Advisory: https://security.samsungmobile.com/serviceWeb.smsb?year=2025&month=11
Restart Required: Yes
Instructions:
1. Open Samsung Smart Switch application
2. Navigate to Help > Check for Updates
3. Follow prompts to update to version 3.7.68.6 or later
4. Restart the application after update completes
🔧 Temporary Workarounds
Disable Smart Switch Network Features
allTemporarily disable network discovery and sharing features in Smart Switch settings
Network Segmentation
allIsolate devices running Smart Switch from untrusted networks using VLANs or firewall rules
🧯 If You Can't Patch
- Disconnect vulnerable devices from shared or public networks
- Disable Smart Switch backup functionality until patching is possible
🔍 How to Verify
Check if Vulnerable:
Check Smart Switch version in application settings or About dialog. Versions below 3.7.68.6 are vulnerable.Check Version:
In Smart Switch: Help > About Smart SwitchVerify Fix Applied:
Confirm version is 3.7.68.6 or higher in application settings and verify backup functionality works normally.📡 Detection & Monitoring
Log Indicators:
- Unexpected network connections to Smart Switch backup ports
- Multiple failed authentication attempts to backup services
Network Indicators:
- Unusual network traffic to/from Smart Switch default ports
- Network scans targeting Smart Switch services
SIEM Query:
source="smartswitch" AND (event_type="backup_access" OR port=* AND dest_ip!=expected_ip)