CVE-2021-1977
📋 TL;DR
This vulnerability allows attackers to read beyond allocated memory boundaries during AEAD decryption in Qualcomm Snapdragon chipsets. It affects devices using Snapdragon Auto, Compute, Connectivity, Mobile, and other Snapdragon platforms. Successful exploitation could lead to information disclosure or system crashes.
💻 Affected Systems
- Snapdragon Auto
- Snapdragon Compute
- Snapdragon Connectivity
- Snapdragon Consumer Electronics Connectivity
- Snapdragon Consumer IOT
- Snapdragon Industrial IOT
- Snapdragon IoT
- Snapdragon Mobile
- Snapdragon Voice & Music
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, data theft, or persistent backdoor installation.
Likely Case
Denial of service through system crashes or information disclosure of sensitive data in memory.
If Mitigated
Limited impact with proper network segmentation and updated firmware.
🎯 Exploit Status
Exploitation requires sending specially crafted network packets during ASSOC response processing with AEAD decryption.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check device manufacturer for specific firmware updates
Vendor Advisory: https://www.qualcomm.com/company/product-security/bulletins/october-2021-bulletin
Restart Required: Yes
Instructions:
1. Check with device manufacturer for firmware updates. 2. Apply manufacturer-provided firmware patches. 3. Reboot device after update. 4. Verify patch installation.
🔧 Temporary Workarounds
Network Segmentation
allIsolate affected devices from untrusted networks to reduce attack surface.
Disable Vulnerable Features
linuxIf possible, disable AEAD decryption features in affected wireless interfaces.
🧯 If You Can't Patch
- Segment network to isolate vulnerable devices from untrusted traffic
- Implement strict firewall rules to limit network access to affected devices
🔍 How to Verify
Check if Vulnerable:
Check device specifications for affected Snapdragon chipsets and firmware version against manufacturer advisories.Check Version:
Device-specific commands vary by manufacturer; typically 'cat /proc/version' or manufacturer-specific firmware check utilities.Verify Fix Applied:
Verify firmware version matches or exceeds manufacturer's patched version.📡 Detection & Monitoring
Log Indicators:
- Unexpected system crashes
- Memory access violation logs
- Wireless association failures
Network Indicators:
- Unusual ASSOC response packets
- Malformed wireless frames targeting AEAD decryption
SIEM Query:
Search for: (event_category:crash OR error:memory) AND (device_type:snapdragon OR chipset:qualcomm)