CVE-2025-20979
📋 TL;DR
CVE-2025-20979 is an out-of-bounds write vulnerability in libsavscmn library affecting Android devices prior to version 15. This allows local attackers to execute arbitrary code with elevated privileges. Only Android devices running versions before Android 15 are affected.
💻 Affected Systems
- Android devices with Samsung modifications
📦 What is this software?
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Full device compromise with root/system-level access, allowing complete control over the device, data theft, and persistence.
Likely Case
Local privilege escalation leading to unauthorized access to sensitive data and system resources.
If Mitigated
Limited impact with proper application sandboxing and SELinux policies in place.
🎯 Exploit Status
Requires local access to the device and knowledge of memory layout. No public exploit code has been disclosed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Android 15 or later security updates
Vendor Advisory: https://security.samsungmobile.com/serviceWeb.smsb?year=2025&month=05
Restart Required: Yes
Instructions:
1. Check for system updates in Settings > Software update. 2. Install Android 15 update if available. 3. Restart device after installation. 4. Verify patch installation in Settings > About phone > Software information.
🔧 Temporary Workarounds
Restrict local app installations
androidPrevent installation of untrusted applications that could exploit this vulnerability.
Settings > Security > Install unknown apps > Disable for all apps
🧯 If You Can't Patch
- Implement strict application whitelisting to prevent untrusted apps from running
- Enable enhanced security features like SELinux and application sandboxing
🔍 How to Verify
Check if Vulnerable:
Check Android version in Settings > About phone > Software information. If version is below 15, device is vulnerable.Check Version:
adb shell getprop ro.build.version.releaseVerify Fix Applied:
Verify Android version is 15 or higher in Settings > About phone > Software information.📡 Detection & Monitoring
Log Indicators:
- Unusual process privilege escalation
- Suspicious memory access patterns in system logs
Network Indicators:
- Not applicable - local vulnerability
SIEM Query:
Not applicable for network detection - monitor device logs for privilege escalation events