CVE-2023-21499
📋 TL;DR
This vulnerability allows local attackers to execute arbitrary code on affected Samsung devices by exploiting an out-of-bounds write in the mPOS TUI trustlet. It affects Samsung mobile devices running vulnerable versions of the mPOS TUI trustlet prior to the May 2023 security update. Attackers need local access to the device to exploit this vulnerability.
💻 Affected Systems
- Samsung mobile devices with mPOS TUI trustlet
📦 What is this software?
Android by Samsung
Android is Google's open-source mobile operating system powering over 3 billion devices worldwide, including smartphones, tablets, smart TVs, automotive systems, wearables, and IoT devices. As the world's dominant mobile OS with approximately 72% global market share, Android serves as the foundation...
Learn more about Android →Android by Samsung
Android is Google's open-source mobile operating system powering over 3 billion devices worldwide, including smartphones, tablets, smart TVs, automotive systems, wearables, and IoT devices. As the world's dominant mobile OS with approximately 72% global market share, Android serves as the foundation...
Learn more about Android →Android by Samsung
Android is Google's open-source mobile operating system powering over 3 billion devices worldwide, including smartphones, tablets, smart TVs, automotive systems, wearables, and IoT devices. As the world's dominant mobile OS with approximately 72% global market share, Android serves as the foundation...
Learn more about Android →Android by Samsung
Android is Google's open-source mobile operating system powering over 3 billion devices worldwide, including smartphones, tablets, smart TVs, automotive systems, wearables, and IoT devices. As the world's dominant mobile OS with approximately 72% global market share, Android serves as the foundation...
Learn more about Android →Android by Samsung
Android is Google's open-source mobile operating system powering over 3 billion devices worldwide, including smartphones, tablets, smart TVs, automotive systems, wearables, and IoT devices. As the world's dominant mobile OS with approximately 72% global market share, Android serves as the foundation...
Learn more about Android →Android by Samsung
Android is Google's open-source mobile operating system powering over 3 billion devices worldwide, including smartphones, tablets, smart TVs, automotive systems, wearables, and IoT devices. As the world's dominant mobile OS with approximately 72% global market share, Android serves as the foundation...
Learn more about Android →Android by Samsung
Android is Google's open-source mobile operating system powering over 3 billion devices worldwide, including smartphones, tablets, smart TVs, automotive systems, wearables, and IoT devices. As the world's dominant mobile OS with approximately 72% global market share, Android serves as the foundation...
Learn more about Android →Android by Samsung
Android is Google's open-source mobile operating system powering over 3 billion devices worldwide, including smartphones, tablets, smart TVs, automotive systems, wearables, and IoT devices. As the world's dominant mobile OS with approximately 72% global market share, Android serves as the foundation...
Learn more about Android →⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attackers to execute arbitrary code with elevated privileges, potentially leading to data theft, surveillance, or persistent backdoor installation.
Likely Case
Local privilege escalation allowing attackers to bypass security restrictions and gain unauthorized access to sensitive functions or data on the device.
If Mitigated
Limited impact if devices are patched, with attackers unable to exploit the vulnerability due to memory protection mechanisms in updated trustlet.
🎯 Exploit Status
Requires local access to device and knowledge of memory manipulation techniques. No public exploit code has been disclosed as of current knowledge.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: SMR May-2023 Release 1
Vendor Advisory: https://security.samsungmobile.com/securityUpdate.smsb?year=2023&month=05
Restart Required: Yes
Instructions:
1. Check for available system updates in device settings. 2. Install the May 2023 security update (SMR May-2023 Release 1). 3. Restart device after installation completes. 4. Verify update was successful by checking security patch level in settings.
🔧 Temporary Workarounds
Restrict physical access
allLimit physical access to devices to prevent local exploitation
Disable unnecessary trustlet functions
androidIf possible, disable mPOS TUI functionality through device management policies
🧯 If You Can't Patch
- Isolate affected devices from sensitive networks and data
- Implement strict physical security controls and monitoring for device access
🔍 How to Verify
Check if Vulnerable:
Check security patch level in device settings. If patch level is earlier than May 2023, device is vulnerable.Check Version:
Settings > About phone > Software information > Android security patch levelVerify Fix Applied:
Verify security patch level shows 'May 1, 2023' or later in Settings > About phone > Software information📡 Detection & Monitoring
Log Indicators:
- Unusual trustlet process activity
- Memory access violations in system logs
- Unexpected privilege escalation attempts
Network Indicators:
- None - this is a local vulnerability
SIEM Query:
Look for: 'mPOS TUI' process anomalies OR 'trustlet' memory violations OR privilege escalation from untrusted applications