CVE-2016-10421
📋 TL;DR
This vulnerability in Qualcomm Snapdragon chipsets used in Android devices fails to properly clear cryptographic key material from memory, potentially allowing attackers to extract sensitive encryption keys. It affects Android devices with specific Qualcomm chipsets before the April 2018 security patch. The high CVSS score of 9.8 indicates critical severity.
💻 Affected Systems
- Android devices with Qualcomm Snapdragon Mobile and Snapdragon Wear chipsets: MDM9206, MDM9607, MDM9615, MDM9625, MDM9635M, MDM9640, MDM9645, MDM9650, MDM9655, MSM8909W, SD 210/SD 212/SD 205, SD 400, SD 410/12, SD 425, SD 430, SD 450, SD 615/16/SD 415, SD 617, SD 625, SD 650/52, SD 800, SD 808, SD 810, SD 820, SD 835, SD 845, SD 850, SDX20
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could extract encryption keys from device memory, leading to complete compromise of encrypted communications, data theft, and bypass of device security mechanisms.
Likely Case
Local attackers with physical access or malware could extract cryptographic keys to decrypt sensitive data or impersonate legitimate services.
If Mitigated
With proper patching, the vulnerability is eliminated; without patching, isolation and access controls can limit exposure.
🎯 Exploit Status
Exploitation requires local access to device memory, typically through malware or physical access; no public exploit code is documented.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Android security patch level 2018-04-05 or later
Vendor Advisory: https://source.android.com/security/bulletin/2018-04-01
Restart Required: Yes
Instructions:
1. Check for Android system updates in device settings. 2. Apply the April 2018 or later security patch. 3. Restart the device after installation. 4. Verify patch installation in settings under 'Security patch level'.
🔧 Temporary Workarounds
Disable unnecessary services
androidReduce attack surface by disabling unused apps and services that might handle sensitive keys.
Enforce device encryption
androidEnsure full device encryption is enabled to protect data at rest, though this doesn't fix the memory issue.
🧯 If You Can't Patch
- Isolate affected devices on segmented networks to limit lateral movement if compromised.
- Implement strict access controls and monitoring for physical access to devices.
🔍 How to Verify
Check if Vulnerable:
Check device settings: Settings > About phone > Android security patch level. If date is before 2018-04-05 and chipset is in affected list, device is vulnerable.Check Version:
On Android device: adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Confirm Android security patch level is 2018-04-05 or later in device settings.📡 Detection & Monitoring
Log Indicators:
- Unusual memory access patterns or kernel logs related to key management in /proc/kmsg or logcat
Network Indicators:
- Suspicious outbound connections from device after key extraction attempts
SIEM Query:
Example: 'device_model:Qualcomm AND security_patch_level:<2018-04-05' for inventory tracking