CVE-2018-13904
📋 TL;DR
This vulnerability allows attackers to bypass TrustZone security through improper input validation in the SCM handler, potentially gaining unauthorized access to secure storage. It affects multiple Qualcomm Snapdragon platforms across automotive, compute, mobile, and IoT devices. The high CVSS score indicates critical impact potential.
💻 Affected Systems
- Snapdragon Auto
- Snapdragon Compute
- Snapdragon Consumer Electronics Connectivity
- Snapdragon Consumer IOT
- Snapdragon Industrial IOT
- Snapdragon Mobile
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of TrustZone secure environment, allowing extraction of cryptographic keys, biometric data, and other sensitive information protected by hardware security.
Likely Case
Unauthorized access to secure storage areas, potentially exposing sensitive device data and undermining hardware-based security protections.
If Mitigated
Limited impact if proper input validation and access controls are implemented at application layer, though hardware trust boundary remains compromised.
🎯 Exploit Status
Exploitation requires local code execution or ability to interact with SCM handler. No public exploit code available as per references.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Qualcomm security bulletins for specific firmware updates
Vendor Advisory: https://www.qualcomm.com/company/product-security/bulletins
Restart Required: Yes
Instructions:
1. Check device firmware version. 2. Contact device manufacturer for updated firmware. 3. Apply firmware update following manufacturer instructions. 4. Reboot device to activate new firmware.
🔧 Temporary Workarounds
Restrict SCM handler access
linuxLimit which applications can interact with SCM handler through SELinux/AppArmor policies
# Requires custom SELinux/AppArmor policy configuration
# Consult device manufacturer for specific implementation
🧯 If You Can't Patch
- Isolate affected devices on segmented network with strict access controls
- Implement application whitelisting to prevent unauthorized code execution
🔍 How to Verify
Check if Vulnerable:
Check device firmware version against Qualcomm's affected versions list. Use 'getprop ro.bootloader' or similar device-specific commands.Check Version:
adb shell getprop ro.bootloader (for Android devices) or device-specific firmware check commandsVerify Fix Applied:
Verify firmware version has been updated to patched version provided by manufacturer. Check Qualcomm security bulletin for confirmation.📡 Detection & Monitoring
Log Indicators:
- Unusual SCM handler access attempts
- TrustZone security violations in system logs
- Unexpected secure storage access patterns
Network Indicators:
- Not applicable - local vulnerability
SIEM Query:
source="kernel" AND "TrustZone" AND ("violation" OR "unauthorized")