CVE-2021-25346
📋 TL;DR
This vulnerability in Samsung's quram library allows attackers to overwrite arbitrary memory locations, potentially leading to arbitrary code execution. It affects Samsung mobile devices running versions prior to the January 2021 security update. The vulnerability requires local access to the device.
💻 Affected Systems
- Samsung mobile devices
📦 What is this software?
Android by Google
Android by Google
Android by Google
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise with attacker gaining full control, data theft, and persistent backdoor installation.
Likely Case
Privilege escalation from a lower-privileged app to system-level access, enabling data access and further exploitation.
If Mitigated
Limited impact due to proper app sandboxing and security controls preventing memory corruption exploitation.
🎯 Exploit Status
Exploitation requires local access and likely app installation; no public exploit code available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: SMR Jan-2021 Release 1 or later
Vendor Advisory: https://security.samsungmobile.com/securityUpdate.smsb
Restart Required: Yes
Instructions:
1. Check for system updates in device settings. 2. Install January 2021 security update or later. 3. Reboot device after installation.
🔧 Temporary Workarounds
Restrict app installations
allOnly install apps from trusted sources like Google Play Store
Disable unknown sources
allPrevent installation of apps from unknown sources in device settings
🧯 If You Can't Patch
- Isolate affected devices from sensitive networks and data
- Implement mobile device management with strict app control policies
🔍 How to Verify
Check if Vulnerable:
Check device security patch level in Settings > About phone > Software informationCheck Version:
Not applicable - check through device settings UIVerify Fix Applied:
Verify security patch level shows January 2021 or later date📡 Detection & Monitoring
Log Indicators:
- Unexpected process crashes in quram library
- Memory access violations in system logs
Network Indicators:
- Unusual outbound connections from system processes
SIEM Query:
Not applicable - primarily local device exploitation