CVE-2021-30254
📋 TL;DR
This vulnerability allows attackers to execute arbitrary code or cause denial of service through a buffer overflow in Qualcomm's factory calibration and test DIAG command. It affects numerous Snapdragon platforms across automotive, mobile, IoT, and wearable devices. Attackers can exploit improper input validation to gain elevated privileges.
💻 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
Local privilege escalation allowing attackers to gain elevated system access from a lower-privileged position.
If Mitigated
Denial of service or system instability if exploit attempts are blocked or contained.
🎯 Exploit Status
Exploitation requires access to diagnostic interface and knowledge of DIAG command structure. No public exploits known.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Vendor-specific firmware updates released November 2021 onward
Vendor Advisory: https://www.qualcomm.com/company/product-security/bulletins/november-2021-bulletin
Restart Required: Yes
Instructions:
1. Check with device manufacturer for firmware updates. 2. Apply Qualcomm-provided patches through OEM update channels. 3. Reboot device after update installation.
🔧 Temporary Workarounds
Disable diagnostic interfaces
allRestrict access to factory calibration and test DIAG interfaces
Device-specific configuration varies by manufacturer
Network segmentation
allIsolate devices with diagnostic interfaces from untrusted networks
🧯 If You Can't Patch
- Implement strict access controls to diagnostic interfaces
- Monitor for unusual DIAG command usage patterns
🔍 How to Verify
Check if Vulnerable:
Check device firmware version against manufacturer's patched versions. Use Qualcomm's security bulletin for chipset-specific details.Check Version:
Device-specific (e.g., Android: 'getprop ro.build.version.security_patch')Verify Fix Applied:
Verify firmware version has been updated to post-November 2021 patches from device manufacturer.📡 Detection & Monitoring
Log Indicators:
- Unusual DIAG command patterns
- Factory calibration interface access attempts
- Buffer overflow attempts in diagnostic logs
Network Indicators:
- Unexpected traffic to diagnostic ports
- DIAG protocol anomalies
SIEM Query:
search 'DIAG' OR 'factory calibration' OR 'test command' in device logs