CVE-2023-33019
📋 TL;DR
This vulnerability allows an attacker to cause a denial-of-service (DoS) condition in WLAN hosts by sending malformed Channel Switch Announcement (CSA) frames with invalid channel information. It affects mobile stations and wireless access points using Qualcomm WLAN chipsets, potentially disrupting wireless connectivity for affected devices.
💻 Affected Systems
- Qualcomm WLAN chipsets and devices using them
📦 What is this software?
205 Firmware by Qualcomm
215 Firmware by Qualcomm
Snapdragon Wear 4100\+ Firmware by Qualcomm
Vision Intelligence 100 Firmware by Qualcomm
Vision Intelligence 200 Firmware by Qualcomm
⚠️ Risk & Real-World Impact
Worst Case
Complete wireless network disruption causing extended downtime for all affected devices, potentially affecting critical infrastructure or business operations.
Likely Case
Temporary wireless connectivity loss for individual devices or small groups of devices, requiring reboots or reconnections.
If Mitigated
Minimal impact with proper network segmentation and monitoring, potentially brief connectivity interruptions.
🎯 Exploit Status
Exploitation requires wireless proximity and ability to transmit crafted CSA frames, but no authentication needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Refer to September 2023 Qualcomm security bulletin for specific patched versions
Vendor Advisory: https://www.qualcomm.com/company/product-security/bulletins/september-2023-bulletin
Restart Required: Yes
Instructions:
1. Check Qualcomm advisory for affected chipset versions. 2. Obtain firmware/driver updates from device manufacturer. 3. Apply updates following manufacturer instructions. 4. Reboot affected devices.
🔧 Temporary Workarounds
Disable CSA functionality
allPrevent channel switching announcements if not required in your environment
# Configuration varies by device/wireless controller
# Consult vendor documentation for CSA disable commands
Network segmentation
allIsolate critical wireless networks from general access networks
# Implement VLAN segmentation
# Use separate SSIDs for critical vs general use
🧯 If You Can't Patch
- Implement wireless intrusion detection/prevention systems to detect CSA attacks
- Monitor wireless networks for unusual CSA activity and implement rate limiting
🔍 How to Verify
Check if Vulnerable:
Check device specifications against Qualcomm's affected chipset list in September 2023 bulletinCheck Version:
# Command varies by device: adb shell getprop ro.build.fingerprint (Android) or lspci -v (Linux)Verify Fix Applied:
Verify firmware/driver version matches patched versions listed in manufacturer updates📡 Detection & Monitoring
Log Indicators:
- Wireless driver crashes
- Unexpected channel switching events
- Increased disconnection logs
Network Indicators:
- Unusual CSA frame patterns
- Multiple devices disconnecting simultaneously
- Abnormal channel switching
SIEM Query:
wireless AND (disconnect OR crash) AND timeframe(5m) count > threshold