CVE-2024-9413
📋 TL;DR
A buffer overflow vulnerability in SCP-Firmware's transport_message_handler function allows an Application Processor to potentially execute arbitrary code on the System Control Processor. This affects devices using Arm SCP-Firmware versions 2.11.0 through 2.15.0, compromising system integrity and confidentiality.
💻 Affected Systems
- Arm System Control Processor Firmware
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise allowing arbitrary code execution on SCP, potentially leading to persistent firmware-level backdoors, denial of service, or complete system takeover.
Likely Case
System instability, crashes, or denial of service affecting device functionality and availability.
If Mitigated
Limited impact with proper access controls preventing AP from reaching SCP, though risk remains for compromised systems.
🎯 Exploit Status
Requires ability to send malformed messages to SCP from AP; exploitation depends on system architecture and access controls.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.16.0 or later
Vendor Advisory: https://developer.arm.com/Arm%20Security%20Center/SCP-Firmware%20Vulnerability
Restart Required: Yes
Instructions:
1. Check current SCP-Firmware version. 2. Obtain updated firmware from device manufacturer. 3. Follow manufacturer's firmware update procedure. 4. Reboot system to apply changes.
🔧 Temporary Workarounds
Restrict AP-SCP Communication
allLimit communication between Application Processor and System Control Processor to essential functions only.
🧯 If You Can't Patch
- Isolate affected systems from untrusted networks and users.
- Implement strict access controls and monitoring for AP processes.
🔍 How to Verify
Check if Vulnerable:
Check SCP-Firmware version via manufacturer-specific tools or system logs; versions 2.11.0-2.15.0 are vulnerable.Check Version:
Manufacturer-specific; consult device documentation for SCP version query commands.Verify Fix Applied:
Confirm SCP-Firmware version is 2.16.0 or later after update.📡 Detection & Monitoring
Log Indicators:
- Unexpected SCP crashes or reboots
- Errors in transport_message_handler logs
- Abnormal AP-SCP communication patterns
Network Indicators:
- Unusual inter-processor communication traffic
SIEM Query:
Search for SCP firmware errors or crashes in system logs, focusing on transport_message_handler events.