CVE-2020-11169
📋 TL;DR
This vulnerability is a buffer over-read in Qualcomm Snapdragon chipsets when processing L2CAP Bluetooth packets, caused by missing integer overflow checks. It allows attackers to read memory beyond allocated buffers, potentially exposing sensitive information. Affected devices include automotive, mobile, IoT, and networking products using specific Snapdragon chipsets.
💻 Affected Systems
- Snapdragon Auto
- Snapdragon Compute
- Snapdragon Connectivity
- Snapdragon Consumer Electronics Connectivity
- Snapdragon Consumer IOT
- Snapdragon Industrial IOT
- Snapdragon Mobile
- Snapdragon Voice & Music
- Snapdragon Wired Infrastructure and Networking
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, data exfiltration, or persistent backdoor installation via Bluetooth proximity attacks.
Likely Case
Information disclosure through memory leaks, potentially exposing encryption keys, authentication tokens, or other sensitive data from adjacent memory.
If Mitigated
Limited impact with proper Bluetooth security controls, network segmentation, and updated firmware preventing successful exploitation.
🎯 Exploit Status
Exploitation requires Bluetooth proximity and crafting malicious L2CAP packets; no authentication needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firmware updates from device manufacturers incorporating Qualcomm's October 2020 security patches
Vendor Advisory: https://www.qualcomm.com/company/product-security/bulletins/october-2020-bulletin
Restart Required: Yes
Instructions:
1. Check with device manufacturer for firmware updates. 2. Apply manufacturer-provided firmware updates. 3. Reboot device after update. 4. Verify Bluetooth functionality post-update.
🔧 Temporary Workarounds
Disable Bluetooth
allTemporarily disable Bluetooth functionality to prevent exploitation.
adb shell settings put global bluetooth_on 0
systemctl stop bluetooth
rfkill block bluetooth
Restrict Bluetooth Visibility
linuxSet Bluetooth to non-discoverable mode and require pairing for connections.
bluetoothctl discoverable off
bluetoothctl pairable off
🧯 If You Can't Patch
- Segment Bluetooth networks and restrict physical access to vulnerable devices
- Implement network monitoring for abnormal Bluetooth traffic patterns
🔍 How to Verify
Check if Vulnerable:
Check device chipset model and firmware version against affected list; if using affected chipset without October 2020 security patches, assume vulnerable.Check Version:
adb shell getprop ro.boot.hardware (for Android) or cat /proc/cpuinfo (for Linux)Verify Fix Applied:
Verify firmware version includes October 2020 or later security patches from manufacturer; test Bluetooth functionality remains operational.📡 Detection & Monitoring
Log Indicators:
- Bluetooth stack crashes
- Memory access violation logs
- Abnormal L2CAP packet size logs
Network Indicators:
- Unusual Bluetooth connection attempts
- Malformed L2CAP packets in Bluetooth traffic
SIEM Query:
source="bluetooth_logs" AND (event="buffer_overflow" OR event="memory_violation" OR packet_size>threshold)