CVE-2020-3642
📋 TL;DR
CVE-2020-3642 is a use-after-free vulnerability in Qualcomm Snapdragon camera drivers that allows local attackers to execute arbitrary code or cause denial of service. It affects multiple Snapdragon chipsets used in consumer IoT devices and mobile phones. The vulnerability occurs when camera applications perform multiple operations, leaving dangling pointers after memory is freed.
💻 Affected Systems
- Snapdragon Consumer IOT
- Snapdragon Mobile
- Kamorta
- QCS605
- Rennell
- Saipan
- SDM670
- SDM710
- SDM845
- SM6150
- SM7150
- SM8150
- SM8250
- SXR1130
- SXR2130
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Local privilege escalation to kernel-level code execution, potentially compromising the entire device and allowing persistence or data theft.
Likely Case
Application crash or denial of service affecting camera functionality, potentially leading to device instability.
If Mitigated
Limited impact with proper kernel hardening and exploit mitigations in place, though camera functionality may still be disrupted.
🎯 Exploit Status
Requires local access and ability to interact with camera services. No public exploit code available as of knowledge cutoff.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: June 2020 security patches and later
Vendor Advisory: https://www.qualcomm.com/company/product-security/bulletins/june-2020-bulletin
Restart Required: Yes
Instructions:
1. Check device manufacturer for available security updates. 2. Apply June 2020 or later Qualcomm security patches. 3. Update device firmware through official channels. 4. Reboot device after update.
🔧 Temporary Workarounds
Disable camera services
androidTemporarily disable camera functionality to prevent exploitation
adb shell pm disable com.android.camera2
adb shell pm disable com.qualcomm.camera
Restrict camera permissions
androidRemove camera permissions from untrusted applications
adb shell pm revoke <package_name> android.permission.CAMERA
🧯 If You Can't Patch
- Implement strict application sandboxing to limit camera access
- Use SELinux/AppArmor policies to restrict camera driver interactions
🔍 How to Verify
Check if Vulnerable:
Check device security patch level: Settings > About phone > Android security patch level. If before June 2020, likely vulnerable.Check Version:
adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify security patch level is June 2020 or later. Check Qualcomm driver versions in /sys/class/camera/.📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs
- Camera service crashes
- Use-after-free kernel warnings
Network Indicators:
- None - local exploitation only
SIEM Query:
source="kernel" AND ("use-after-free" OR "UAF" OR "camera crash")