CVE-2015-9157
📋 TL;DR
This vulnerability allows attackers to exploit a race condition in Qualcomm Snapdragon chipsets' Widevine DRM implementation, potentially leading to buffer overflow/over-read attacks. It affects Android devices with specific Qualcomm chipsets before the April 2018 security patch.
💻 Affected Systems
- Android devices with Qualcomm Snapdragon chipsets
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution with kernel privileges, allowing complete device compromise, data theft, and persistent backdoor installation.
Likely Case
Application crashes, denial of service, or limited information disclosure through memory reads.
If Mitigated
No impact if patched; unpatched devices remain vulnerable to exploitation.
🎯 Exploit Status
Exploitation requires race condition timing and specific memory manipulation, making reliable exploitation challenging but possible.
🛠️ 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, update device through Settings > System > System update. 3. Restart device after update completes.
🔧 Temporary Workarounds
Disable Widevine DRM services
androidDisable or restrict Widevine DRM functionality to prevent exploitation
adb shell pm disable com.google.android.gms/.droidguard.DroidGuardService
adb shell pm disable com.android.dreams.basic
🧯 If You Can't Patch
- Isolate affected devices from untrusted networks and limit internet access
- Implement application whitelisting to prevent unauthorized app installation
🔍 How to Verify
Check if Vulnerable:
Check Android security patch level in Settings > About phone > Android security patch level. If date is before April 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 after applying update.📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs
- Widevine service crashes
- Memory access violation errors in system logs
Network Indicators:
- Unusual DRM-related network traffic
- Suspicious connections to Widevine services
SIEM Query:
source="android_system" AND ("widevine" OR "drm") AND ("crash" OR "panic" OR "violation")