CVE-2023-20966
📋 TL;DR
This CVE describes a heap buffer overflow vulnerability in Android's inflate.c library that allows local privilege escalation without user interaction. An attacker could exploit this to gain elevated privileges on affected Android devices. The vulnerability affects Android versions 11 through 13.
💻 Affected Systems
- Android
📦 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 root/system-level access, allowing installation of persistent malware, data theft, and bypassing of all security controls.
Likely Case
Local privilege escalation allowing an attacker to execute arbitrary code with elevated permissions, potentially leading to data exfiltration or further system compromise.
If Mitigated
Limited impact if devices are fully patched and have additional security controls like SELinux enforcing mode and app sandboxing properly configured.
🎯 Exploit Status
Exploitation requires local access to the device. No user interaction needed once attacker has foothold on device.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Android Security Bulletin March 2023 patches
Vendor Advisory: https://source.android.com/security/bulletin/2023-03-01
Restart Required: Yes
Instructions:
1. Check for Android system updates in Settings > System > System update. 2. Install the March 2023 security patch. 3. Reboot device after installation completes.
🔧 Temporary Workarounds
No workarounds available
allThis is a core system library vulnerability requiring patching at the OS level.
🧯 If You Can't Patch
- Restrict physical access to devices and implement strong device management policies
- Monitor for suspicious privilege escalation attempts and unusual process behavior
🔍 How to Verify
Check if Vulnerable:
Check Android version in Settings > About phone > Android version. If version is 11, 12, 12L, or 13 without March 2023 security patches, device is vulnerable.Check Version:
adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify Android Security Patch Level in Settings > About phone shows March 2023 or later.📡 Detection & Monitoring
Log Indicators:
- Unusual process privilege escalation
- SELinux denials related to inflate operations
- Crash reports from system processes
Network Indicators:
- Not applicable - local vulnerability
SIEM Query:
Not applicable for network detection - focus on endpoint monitoring for privilege escalation