CVE-2025-21039
📋 TL;DR
This vulnerability in S Assistant allows local attackers to modify itinerary information due to improper intent verification in SystemExceptionalBroadcastReceiver. It affects S Assistant versions prior to 9.3.2 on Samsung devices. Attackers must have local access to the device to exploit this flaw.
💻 Affected Systems
- Samsung S Assistant
📦 What is this software?
Sassistant by Samsung
⚠️ Risk & Real-World Impact
Worst Case
Malicious local user could modify or delete itinerary information, potentially causing travel disruptions, missed appointments, or unauthorized changes to scheduled events.
Likely Case
Local attacker with physical access or malicious app could tamper with itinerary data, causing inconvenience or minor disruption to user's schedule.
If Mitigated
With proper access controls and updated software, only authorized users can modify itinerary information.
🎯 Exploit Status
Requires local access to device. Likely exploited through malicious app or physical access.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 9.3.2 or later
Vendor Advisory: https://security.samsungmobile.com/serviceWeb.smsb?year=2025&month=09
Restart Required: No
Instructions:
1. Open Samsung Galaxy Store or Google Play Store. 2. Search for 'S Assistant'. 3. Check for updates. 4. Update to version 9.3.2 or later. 5. Alternatively, update through device settings > Software update.
🔧 Temporary Workarounds
Disable S Assistant
AndroidTemporarily disable S Assistant to prevent exploitation until patched
Settings > Apps > S Assistant > Disable
Restrict Local Access
AndroidImplement device access controls and screen locks to prevent unauthorized local access
Settings > Security > Screen lock type > Set strong password/PIN
🧯 If You Can't Patch
- Implement strict device access controls and screen locks
- Disable S Assistant functionality until patch can be applied
🔍 How to Verify
Check if Vulnerable:
Check S Assistant version: Open S Assistant > Settings > About > Check version numberCheck Version:
adb shell dumpsys package com.samsung.android.svoice | grep versionNameVerify Fix Applied:
Verify S Assistant version is 9.3.2 or higher using same method📡 Detection & Monitoring
Log Indicators:
- Unauthorized modifications to itinerary data
- Suspicious intent broadcasts to SystemExceptionalBroadcastReceiver
Network Indicators:
- None - local vulnerability only
SIEM Query:
app:'S Assistant' AND event:'itinerary_modification' AND user NOT IN authorized_users