CVE-2015-9201
📋 TL;DR
An integer overflow vulnerability in the Qualcomm TrustZone Baseband Processor (tzbsp) allows attackers to escalate privileges on affected Android devices. This affects Android devices with Qualcomm Snapdragon chipsets before the April 2018 security patch. Successful exploitation could give attackers elevated system privileges.
💻 Affected Systems
- Android devices with Qualcomm Snapdragon chipsets
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise with root/system-level access, allowing installation of persistent malware, data theft, and bypassing of all security controls.
Likely Case
Privilege escalation from a lower-privileged app to system-level access, enabling data theft, surveillance, or further exploitation.
If Mitigated
Limited impact if device is fully patched and has additional security controls like verified boot and SELinux enforcement.
🎯 Exploit Status
Requires local access or ability to execute code on device. No public exploit code available.
🛠️ 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 device security patch level in Settings > About phone > Android security patch level. 2. If before April 2018, install latest available system update. 3. For enterprise devices, push updates through MDM/EMM solutions.
🔧 Temporary Workarounds
No effective workarounds
allThis is a firmware-level vulnerability requiring vendor patches. No configuration changes can mitigate the vulnerability.
🧯 If You Can't Patch
- Isolate affected devices from sensitive networks and data
- Implement strict application whitelisting and monitoring
🔍 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 security patch level shows April 2018 or later. Check Qualcomm chipset version matches affected list.📡 Detection & Monitoring
Log Indicators:
- Unusual privilege escalation attempts
- SELinux denials related to tzbsp
- Abnormal TrustZone access patterns
Network Indicators:
- Unusual outbound connections from system processes
- Suspicious update/package installation traffic
SIEM Query:
source="android_logs" AND (event="privilege_escalation" OR process="tzbsp")