CVE-2021-30288
📋 TL;DR
This vulnerability allows attackers to trigger a stack overflow by exploiting improper length validation of TLV (Type-Length-Value) data structures in Qualcomm Snapdragon chipsets. Successful exploitation could lead to arbitrary code execution or denial of service. Affected devices include smartphones, IoT devices, automotive systems, and networking equipment using vulnerable Snapdragon processors.
💻 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
- Snapdragon Wired Infrastructure and Networking
📦 What is this software?
Sd7c Firmware by Qualcomm
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution with kernel privileges, allowing complete device compromise, data theft, or persistent backdoor installation.
Likely Case
Denial of service causing device crashes or instability, potentially requiring physical reset.
If Mitigated
Limited impact if proper input validation and memory protections are implemented at application layer.
🎯 Exploit Status
Exploitation requires sending malformed TLV data to vulnerable components, but specific attack vectors depend on device configuration and exposed interfaces.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Refer to Qualcomm October 2021 security bulletin for specific chipset updates
Vendor Advisory: https://www.qualcomm.com/company/product-security/bulletins/october-2021-bulletin
Restart Required: Yes
Instructions:
1. Check device manufacturer for firmware updates 2. Apply Qualcomm-provided patches through OEM channels 3. Reboot device after update 4. Verify patch installation
🔧 Temporary Workarounds
Network segmentation
allIsolate affected devices from untrusted networks to limit attack surface
Input validation at application layer
allImplement additional TLV length validation in applications using affected components
🧯 If You Can't Patch
- Implement strict network access controls to limit communication with affected devices
- Monitor for abnormal device behavior or crashes indicating potential exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check device chipset model and firmware version against Qualcomm's advisory. Use 'cat /proc/cpuinfo' on Linux-based systems to identify Snapdragon processors.Check Version:
Device-specific commands vary by manufacturer. On Android: 'getprop ro.build.fingerprint' or check Settings > About PhoneVerify Fix Applied:
Verify firmware version has been updated to post-October 2021 release. Check with device manufacturer for specific patch verification procedures.📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs
- Driver crash reports
- Unexpected process termination in system logs
Network Indicators:
- Unusual TLV traffic patterns to device management interfaces
- Protocol anomalies in chipset communication
SIEM Query:
Search for 'kernel panic' OR 'segmentation fault' OR 'stack overflow' in device logs from Snapdragon-based systems