CVE-2023-21514
📋 TL;DR
This vulnerability in Samsung Galaxy Store allows attackers to bypass scheme validation in InstantPlay Deeplink functionality, enabling them to execute JavaScript APIs that can install APK files without user consent. It affects Galaxy Store versions prior to 4.5.49.8 on Samsung Android devices. Attackers can exploit this to install malicious applications through the Galaxy Store interface.
💻 Affected Systems
- Samsung Galaxy Store
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could silently install malicious APKs with system-level permissions, potentially leading to full device compromise, data theft, or persistent backdoor installation.
Likely Case
Attackers trick users into clicking malicious links that exploit the vulnerability to install unwanted or malicious applications through Galaxy Store.
If Mitigated
With updated Galaxy Store version, the scheme validation prevents unauthorized JavaScript API execution and APK installation.
🎯 Exploit Status
Exploitation requires user to click malicious link but doesn't require authentication. JavaScript execution leads to APK installation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.5.49.8 and later
Vendor Advisory: https://security.samsungmobile.com/serviceWeb.smsb?year=2023&month=01
Restart Required: No
Instructions:
1. Open Galaxy Store app 2. Go to Settings 3. Check for updates 4. Install version 4.5.49.8 or later 5. Alternatively, update through Samsung's app update mechanism
🔧 Temporary Workarounds
Disable Galaxy Store auto-updates
androidPrevent automatic installation of potentially malicious APKs through Galaxy Store
Use alternative app stores
androidTemporarily disable Galaxy Store and use Google Play Store or other trusted sources
🧯 If You Can't Patch
- Disable Galaxy Store completely via device administrator settings
- Implement network filtering to block malicious deeplink URLs
🔍 How to Verify
Check if Vulnerable:
Check Galaxy Store version in app settings. If version is below 4.5.49.8, device is vulnerable.Check Version:
No command line option. Check via: Galaxy Store → Settings → About Galaxy StoreVerify Fix Applied:
Confirm Galaxy Store version is 4.5.49.8 or higher in app settings.📡 Detection & Monitoring
Log Indicators:
- Unusual APK installation events via Galaxy Store
- JavaScript API calls from deeplink sources
Network Indicators:
- HTTP requests to malicious domains triggering deeplinks
- Unusual traffic patterns to Galaxy Store endpoints
SIEM Query:
Not applicable for typical mobile device management