CVE-2024-20021
📋 TL;DR
This vulnerability in ATF SPM allows attackers to remap physical memory to virtual memory due to a logic error, enabling local privilege escalation. It affects systems using MediaTek chipsets with vulnerable firmware. Exploitation requires System execution privileges but no user interaction.
💻 Affected Systems
- MediaTek chipsets with ATF SPM firmware
📦 What is this software?
Android by Google
Android by Google
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with kernel-level access, allowing attackers to bypass security controls, install persistent malware, or access sensitive data.
Likely Case
Local privilege escalation enabling attackers to gain elevated system privileges from a lower-privileged context.
If Mitigated
Limited impact if proper access controls and privilege separation are implemented, though the vulnerability still exists at the firmware level.
🎯 Exploit Status
Exploitation requires System execution privileges but no user interaction. The logic error in memory remapping suggests technical complexity but no public exploit details available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firmware patch referenced by ID: ALPS08584568
Vendor Advisory: https://corp.mediatek.com/product-security-bulletin/May-2024
Restart Required: Yes
Instructions:
1. Check with device manufacturer for firmware updates. 2. Apply the firmware patch ALPS08584568. 3. Reboot the device to activate the patch. 4. Verify the patch is applied through system logs or version checks.
🔧 Temporary Workarounds
Restrict System Privileges
allLimit applications and users with System execution privileges to reduce attack surface
Review and minimize applications with system-level permissions
Implement least privilege access controls
🧯 If You Can't Patch
- Isolate affected devices from critical networks and sensitive data
- Implement strict access controls and monitoring for systems with System execution privileges
🔍 How to Verify
Check if Vulnerable:
Check device firmware version and compare against MediaTek security bulletin. Look for ATF SPM version details in system logs.Check Version:
Check device settings > About phone > Build number or use adb shell getprop ro.build.fingerprintVerify Fix Applied:
Verify firmware patch ALPS08584568 is applied through system update logs or vendor verification tools.📡 Detection & Monitoring
Log Indicators:
- Unusual memory mapping operations in kernel logs
- Suspicious privilege escalation attempts
Network Indicators:
- Not applicable - local vulnerability
SIEM Query:
source="kernel" AND ("memory remap" OR "ATF SPM" OR privilege escalation)