CVE-2021-1976
📋 TL;DR
This critical vulnerability in Qualcomm Snapdragon chipsets allows remote code execution due to a use-after-free memory corruption flaw in Wi-Fi P2P (peer-to-peer) device address validation. Attackers can exploit this by sending specially crafted PD Request frames to vulnerable devices, potentially gaining full control. Affected products include Snapdragon Auto, Compute, Connectivity, Consumer IoT, Industrial IoT, Voice & Music, Wearables, and Wired Infrastructure devices.
💻 Affected Systems
- Snapdragon Auto
- Snapdragon Compute
- Snapdragon Connectivity
- Snapdragon Consumer IOT
- Snapdragon Industrial IOT
- Snapdragon Voice & Music
- Snapdragon Wearables
- Snapdragon Wired Infrastructure and Networking
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote attacker gains full system control (root/admin privileges) over vulnerable device, enabling data theft, persistence, lateral movement, or device bricking.
Likely Case
Remote code execution leading to device compromise, data exfiltration, or integration into botnets.
If Mitigated
Denial of service or system instability if exploit fails to achieve code execution.
🎯 Exploit Status
Exploitation requires sending malicious Wi-Fi frames, which can be done with standard wireless tools. No authentication needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firmware updates from device manufacturers; check specific vendor bulletins.
Vendor Advisory: https://www.qualcomm.com/company/product-security/bulletins/august-2021-bulletin
Restart Required: Yes
Instructions:
1. Check with device manufacturer for firmware updates. 2. Apply the latest firmware patch. 3. Reboot the device to activate the fix.
🔧 Temporary Workarounds
Disable Wi-Fi P2P
allTurn off Wi-Fi Direct/peer-to-peer functionality if not required.
Varies by device; typically in Wi-Fi settings or via adb: 'adb shell settings put global wifi_p2p_device_name ""' (Android)
Network Segmentation
allIsolate vulnerable devices on separate network segments to limit attack surface.
🧯 If You Can't Patch
- Disable Wi-Fi entirely if not needed.
- Implement strict network access controls and monitor for anomalous Wi-Fi traffic.
🔍 How to Verify
Check if Vulnerable:
Check device firmware version against manufacturer's security bulletins; use 'adb shell getprop ro.build.fingerprint' (Android) or similar for other systems.Check Version:
Device-specific; e.g., 'adb shell getprop' for Android-based devices.Verify Fix Applied:
Confirm firmware version has been updated to a patched release per vendor documentation.📡 Detection & Monitoring
Log Indicators:
- Unusual Wi-Fi connection attempts
- System crashes or reboots related to Wi-Fi drivers
Network Indicators:
- Malformed P2P PD Request frames on Wi-Fi networks
- Anomalous broadcast/multicast traffic on Wi-Fi
SIEM Query:
Example: 'source="wifi_logs" AND (event="p2p_request" OR event="driver_crash")'