CVE-2023-21100
📋 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 12, 12L, and 13.
💻 Affected Systems
- Android
📦 What is this software?
Android by Google
Android by Google
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Full device compromise with root/system-level access, allowing installation of persistent malware, data theft, and complete control over the device.
Likely Case
Local privilege escalation allowing attackers to bypass app sandboxing, access sensitive data from other apps, or install malicious apps with elevated permissions.
If Mitigated
Limited impact if devices are fully patched and have security features like SELinux, verified boot, and app sandboxing properly configured.
🎯 Exploit Status
Exploitation requires local access to the device. No public proof-of-concept has been released, but the vulnerability is serious enough that exploitation is likely possible by skilled attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Android Security Bulletin April 2023 patches
Vendor Advisory: https://source.android.com/security/bulletin/2023-04-01
Restart Required: Yes
Instructions:
1. Check for Android system updates in Settings > System > System update. 2. Install the April 2023 security patch or later. 3. Restart the device after installation. 4. For enterprise devices, push updates through MDM solutions.
🔧 Temporary Workarounds
No effective workarounds
allThis is a core system vulnerability that requires patching. No configuration changes or workarounds can mitigate the vulnerability.
🧯 If You Can't Patch
- Isolate affected devices from sensitive networks and data
- Implement strict app installation policies and monitor for suspicious app behavior
🔍 How to Verify
Check if Vulnerable:
Check Android version in Settings > About phone > Android version. If version is 12, 12L, or 13 without April 2023 security patches, device is vulnerable.Check Version:
adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify Android Security Patch Level is April 2023 or later in Settings > About phone > Android security update.📡 Detection & Monitoring
Log Indicators:
- Unusual privilege escalation attempts in system logs
- SELinux denials related to inflate operations
- Crash reports from system processes
Network Indicators:
- No direct network indicators as this is a local vulnerability
SIEM Query:
source="android_system_logs" AND (event="privilege_escalation" OR process="inflate" AND result="crash")