CVE-2025-21040
📋 TL;DR
This vulnerability in S Assistant allows local attackers to modify itinerary information due to improper intent verification in ExternalBroadcastReceiver. 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 data, potentially causing travel disruptions, missed appointments, or financial losses if itinerary includes booking information.
Likely Case
Local attacker modifies itinerary entries to cause confusion or minor inconvenience, such as changing meeting times or locations.
If Mitigated
With proper access controls and updated software, impact is limited to unauthorized users being unable to modify itinerary data.
🎯 Exploit Status
Requires local access and knowledge of intent structure. No public exploit code available at this time.
🛠️ 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 Galaxy Store on Samsung device. 2. Search for 'S Assistant'. 3. Update to version 9.3.2 or later. 4. Alternatively, enable auto-updates for apps in Galaxy Store settings.
🔧 Temporary Workarounds
Disable S Assistant
AndroidTemporarily disable S Assistant to prevent exploitation until patched
Settings > Apps > S Assistant > Disable
Restrict Local Access
allImplement device access controls to limit who can physically access vulnerable devices
🧯 If You Can't Patch
- Implement strict physical security controls for devices
- Monitor for unusual itinerary modifications and implement data validation checks
🔍 How to Verify
Check if Vulnerable:
Check S Assistant version in Galaxy Store or device app settings. If version is below 9.3.2, device is vulnerable.Check Version:
No CLI command. Check via: Settings > Apps > S Assistant > App info > VersionVerify Fix Applied:
Confirm S Assistant version is 9.3.2 or higher in app settings after update.📡 Detection & Monitoring
Log Indicators:
- Unusual intent broadcasts to ExternalBroadcastReceiver
- Unexpected itinerary modifications in S Assistant logs
Network Indicators:
- None - this is a local vulnerability
SIEM Query:
Not applicable for local intent-based vulnerability