CVE-2015-9174
📋 TL;DR
This vulnerability in Qualcomm's TrustZone Execution Environment (QSEE) allows attackers to overwrite memory by exploiting improper validation of return values before buffer allocation. It affects Android devices with specific Qualcomm Snapdragon chipsets. Successful exploitation could lead to arbitrary code execution in the secure TQS application context.
💻 Affected Systems
- Android devices with Qualcomm Snapdragon Mobile SD 410/12
- Android devices with Qualcomm Snapdragon Mobile SD 617
- Android devices with Qualcomm Snapdragon Mobile SD 650/52
- Android devices with Qualcomm Snapdragon Mobile SD 800
- Android devices with Qualcomm Snapdragon Mobile SD 808
- Android devices with Qualcomm Snapdragon Mobile SD 810
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the TrustZone secure environment, allowing attackers to execute arbitrary code with high privileges, potentially bypassing hardware-based security features and gaining persistent access.
Likely Case
Local privilege escalation from a compromised Android application to TrustZone level, enabling extraction of cryptographic keys, biometric data, or other sensitive information protected by hardware security.
If Mitigated
Limited impact if devices are patched with the April 2018 security update, as the vulnerability requires local access and specific conditions to exploit.
🎯 Exploit Status
Exploitation requires local access and knowledge of QSEE internals. No public exploit code has been documented, but the vulnerability is in a critical security component.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Android security patch level April 5, 2018 or later
Vendor Advisory: https://source.android.com/security/bulletin/2018-04-01
Restart Required: Yes
Instructions:
1. Check current Android security patch level in Settings > About phone > Android security patch level. 2. If before April 2018, apply the April 2018 Android security update. 3. For devices no longer receiving updates, consider replacing with supported hardware.
🔧 Temporary Workarounds
No effective workarounds
allThis is a TrustZone hardware security vulnerability that cannot be mitigated through configuration changes or software workarounds.
🧯 If You Can't Patch
- Replace affected devices with hardware that has the April 2018 security patch or later
- Isolate vulnerable devices from sensitive networks and data, treat them as potentially compromised
🔍 How to Verify
Check if Vulnerable:
Check Android security patch level in Settings > About phone > Android security patch level. If date is before April 5, 2018, device is vulnerable.Check Version:
adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify Android security patch level shows April 2018 or later in device settings.📡 Detection & Monitoring
Log Indicators:
- Unusual TrustZone/QSEE application crashes
- Suspicious memory access patterns in kernel logs
- Unexpected privilege escalation attempts
Network Indicators:
- No direct network indicators as this is a local vulnerability
SIEM Query:
No standard SIEM query available due to TrustZone isolation. Monitor for abnormal device behavior and privilege escalation patterns.