CVE-2020-11227
📋 TL;DR
This vulnerability allows attackers to write data beyond allocated memory boundaries while parsing RTT/TTY packets in Qualcomm Snapdragon chipsets. It affects numerous Snapdragon-powered devices across automotive, mobile, IoT, and wearable platforms. Successful exploitation could lead to remote code execution or system compromise.
💻 Affected Systems
- Snapdragon Auto
- Snapdragon Compute
- Snapdragon Connectivity
- Snapdragon Consumer IOT
- Snapdragon Industrial IOT
- Snapdragon IoT
- Snapdragon Mobile
- Snapdragon Voice & Music
- Snapdragon Wearables
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution with kernel privileges leading to complete device compromise, data theft, or persistent backdoor installation.
Likely Case
Device crash/reboot (denial of service) or limited code execution in affected process context.
If Mitigated
System remains stable with no impact if patched or if exploit attempts are blocked by network/device controls.
🎯 Exploit Status
Out-of-bounds write vulnerabilities often lead to reliable exploitation, but specific exploit development requires chipset/firmware knowledge.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Refer to device manufacturer updates; Qualcomm provided fixes to OEMs in March 2021 bulletin.
Vendor Advisory: https://www.qualcomm.com/company/product-security/bulletins/march-2021-bulletin
Restart Required: Yes
Instructions:
1. Check with device manufacturer for firmware/software updates. 2. Apply manufacturer-provided patches. 3. Reboot device after update. 4. Verify patch installation through version checks.
🔧 Temporary Workarounds
Network segmentation
allIsolate affected devices from untrusted networks to limit attack surface.
Disable unnecessary services
linuxTurn off RTT/TTY packet processing if not required for device functionality.
🧯 If You Can't Patch
- Implement strict network access controls to limit communication with affected devices.
- Monitor for abnormal device behavior or crashes that might indicate exploitation attempts.
🔍 How to Verify
Check if Vulnerable:
Check device firmware version against manufacturer security bulletins; examine if device uses affected Snapdragon chipsets.Check Version:
Device-specific commands vary by manufacturer (e.g., Android: 'getprop ro.build.fingerprint', Linux: 'uname -a' plus chipset info)Verify Fix Applied:
Confirm installation of manufacturer security updates dated March 2021 or later; verify firmware version matches patched releases.📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs
- Process crashes related to RTT/TTY services
- Memory corruption warnings in system logs
Network Indicators:
- Unusual packet patterns to RTT/TTY ports
- Traffic to/from unexpected network interfaces
SIEM Query:
Example: 'device_logs WHERE process_name CONTAINS "rtt" OR process_name CONTAINS "tty" AND event_type = "crash"'