CVE-2023-21030
📋 TL;DR
This CVE describes a double-free vulnerability in Android's keystore component that allows local privilege escalation. An unprivileged process can corrupt memory to gain elevated privileges without user interaction. Only Android 13 devices are affected.
💻 Affected Systems
- Android
📦 What is this software?
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise with attacker gaining root/system-level privileges, allowing installation of persistent malware, data theft, and bypassing all security controls.
Likely Case
Local attacker gains elevated privileges to access sensitive data, modify system settings, or install malicious apps without user consent.
If Mitigated
With proper patching, the vulnerability is eliminated; without patching, application sandboxing and SELinux provide partial mitigation but not complete protection.
🎯 Exploit Status
Requires local access and knowledge of memory corruption techniques, but no user interaction needed. Double-free vulnerabilities are well-understood attack vectors.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Android Security Update March 2023 or later
Vendor Advisory: https://source.android.com/security/bulletin/pixel/2023-03-01
Restart Required: Yes
Instructions:
1. Check for Android system updates in Settings > System > System update. 2. Install March 2023 or later security update. 3. Reboot device after installation.
🔧 Temporary Workarounds
No effective workarounds
allThis is a core Android framework vulnerability requiring patching at the OS level.
🧯 If You Can't Patch
- Restrict physical access to devices and monitor for suspicious privilege escalation attempts
- Implement strict app vetting and only install apps from trusted sources to reduce attack surface
🔍 How to Verify
Check if Vulnerable:
Check Android version in Settings > About phone > Android version. If it shows Android 13 without March 2023 security patch, device is vulnerable.Check Version:
adb shell getprop ro.build.version.release && 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:
- Unexpected keystore access attempts
- Process privilege escalation anomalies
- SELinux denials related to keystore
Network Indicators:
- None - this is a local attack
SIEM Query:
source="android_logs" AND (process_name="keystore" OR message="double free" OR message="memory corruption")