CVE-2023-21102
📋 TL;DR
This vulnerability allows local attackers to bypass shadow stack protection in the Android kernel, potentially leading to privilege escalation without requiring user interaction. It affects Android devices running vulnerable kernel versions, allowing attackers with local access to gain elevated privileges.
💻 Affected Systems
- Android
📦 What is this software?
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise where an attacker gains root privileges, potentially installing persistent malware, accessing sensitive data, or disabling security controls.
Likely Case
Local privilege escalation allowing attackers to bypass application sandboxes, access other user data, or install malicious applications with elevated permissions.
If Mitigated
Limited impact if devices are fully patched, have strict application sandboxing, and minimal local attack surface.
🎯 Exploit Status
Exploitation requires local access and knowledge of kernel memory layout. No public exploit code is known at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Android security patch level May 2023 or later
Vendor Advisory: https://source.android.com/security/bulletin/2023-05-01
Restart Required: Yes
Instructions:
1. Apply the May 2023 Android security patch. 2. Update Android kernel to version containing fix for A-260821414. 3. Reboot device to apply kernel changes.
🔧 Temporary Workarounds
Restrict local access
allLimit physical and network access to devices to reduce attack surface
Application sandboxing
androidEnsure strict application sandboxing and permission controls are enforced
🧯 If You Can't Patch
- Isolate affected devices from critical networks and sensitive data
- Implement strict application vetting and monitoring for suspicious privilege escalation attempts
🔍 How to Verify
Check if Vulnerable:
Check Android security patch level in Settings > About phone > Android version. If patch level is before May 2023, device is likely vulnerable.Check Version:
adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify Android security patch level shows May 2023 or later. Check kernel version against patched releases.📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs
- Unexpected privilege escalation attempts
- SELinux/AppArmor denials related to kernel memory access
Network Indicators:
- None - this is a local exploit
SIEM Query:
source="android_kernel" AND (event_type="privilege_escalation" OR event_type="kernel_exception")