CVE-2024-20087
📋 TL;DR
This CVE describes an out-of-bounds write vulnerability in the vdec component of MediaTek chipsets, allowing local privilege escalation to System level without user interaction. It affects devices using vulnerable MediaTek chipsets, primarily Android smartphones and IoT devices. Attackers with initial access could exploit this to gain full system control.
💻 Affected Systems
- MediaTek chipsets with vdec component
- Android devices using affected MediaTek chipsets
- IoT devices using affected MediaTek chipsets
📦 What is this software?
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attackers to execute arbitrary code with System privileges, install persistent malware, access all user data, and potentially bypass hardware security features.
Likely Case
Local privilege escalation from a lower-privileged app or user to System level, enabling data theft, surveillance, or further exploitation of the device.
If Mitigated
With proper security controls like SELinux enforcement, app sandboxing, and minimal privilege apps, exploitation would be limited to specific contexts but still dangerous.
🎯 Exploit Status
Exploitation requires local access and System execution privileges, which may be obtained through other vulnerabilities or malicious apps.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firmware with patch ID ALPS08932916
Vendor Advisory: https://corp.mediatek.com/product-security-bulletin/September-2024
Restart Required: Yes
Instructions:
1. Check device manufacturer for security updates. 2. Apply firmware update containing patch ALPS08932916. 3. Reboot device after update. 4. Verify patch installation through vendor-specific verification methods.
🔧 Temporary Workarounds
Restrict app permissions
androidLimit System execution privileges for apps to reduce attack surface
Enable SELinux enforcement
linuxStrengthen mandatory access controls to limit privilege escalation
setenforce 1
🧯 If You Can't Patch
- Isolate affected devices from critical networks and sensitive data
- Implement application allowlisting to prevent unauthorized app execution
🔍 How to Verify
Check if Vulnerable:
Check device firmware version against MediaTek security bulletin and manufacturer advisoriesCheck Version:
Manufacturer-specific commands vary; typically check Settings > About Phone > Build NumberVerify Fix Applied:
Verify firmware version includes patch ALPS08932916 through device settings or manufacturer tools📡 Detection & Monitoring
Log Indicators:
- Unusual System privilege escalations
- vdec component crashes or anomalies
- SELinux denials related to vdec
Network Indicators:
- Unusual outbound connections from System-level processes
SIEM Query:
Process elevation from normal user to System level OR vdec component anomalies