CVE-2020-11222
📋 TL;DR
This vulnerability is a buffer over-read in Qualcomm Snapdragon chipsets when processing MT SMS messages with maximum length due to improper length checks. It allows attackers to read memory beyond allocated buffers, potentially exposing sensitive information. Affected devices include those using Snapdragon Auto, Compute, Connectivity, Consumer IoT, Industrial IoT, IoT, and Mobile platforms.
💻 Affected Systems
- Snapdragon Auto
- Snapdragon Compute
- Snapdragon Connectivity
- Snapdragon Consumer IOT
- Snapdragon Industrial IOT
- Snapdragon IoT
- Snapdragon Mobile
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, data exfiltration, or persistent backdoor installation.
Likely Case
Information disclosure through memory leaks, potentially exposing sensitive data like encryption keys or user information.
If Mitigated
Limited information disclosure with proper memory protections, but still potentially exposing some sensitive data.
🎯 Exploit Status
Exploitation requires sending specially crafted SMS messages to vulnerable devices.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Vendor-specific firmware updates
Vendor Advisory: https://www.qualcomm.com/company/product-security/bulletins/march-2021-bulletin
Restart Required: Yes
Instructions:
1. Check device manufacturer for firmware updates. 2. Apply Qualcomm-provided patches through OEM firmware updates. 3. Reboot device after update.
🔧 Temporary Workarounds
Disable SMS processing
allDisable SMS message processing on affected devices if not required
Network filtering
allImplement SMS filtering at network level to block malicious messages
🧯 If You Can't Patch
- Isolate affected devices from untrusted networks
- Implement strict SMS filtering and monitoring
🔍 How to Verify
Check if Vulnerable:
Check device chipset model and firmware version against Qualcomm advisoryCheck Version:
Device-specific commands vary by manufacturer (e.g., 'getprop ro.bootloader' on Android)Verify Fix Applied:
Verify firmware version has been updated to patched version from device manufacturer📡 Detection & Monitoring
Log Indicators:
- Unusual SMS processing errors
- Memory access violations in system logs
Network Indicators:
- Suspicious SMS traffic patterns
- Unusual SMS message sizes
SIEM Query:
Search for SMS processing errors or memory violation events in device logs