CVE-2021-30274
📋 TL;DR
This integer overflow vulnerability in Qualcomm Snapdragon chipsets allows attackers to potentially bypass access control mechanisms or execute arbitrary code. It affects multiple Snapdragon product lines including Auto, Compute, Connectivity, Consumer IOT, Industrial IOT, Voice & Music, and Wired Infrastructure and Networking. The vulnerability stems from insufficient size and address validation in access control initialization interfaces.
💻 Affected Systems
- Snapdragon Auto
- Snapdragon Compute
- Snapdragon Connectivity
- Snapdragon Consumer IOT
- Snapdragon Industrial IOT
- 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 leading to complete system compromise, data theft, or persistent backdoor installation.
Likely Case
Privilege escalation allowing attackers to bypass security controls, access restricted data, or disrupt system functionality.
If Mitigated
Limited impact with proper network segmentation and least privilege access controls in place.
🎯 Exploit Status
Exploitation requires local access or ability to execute code on the device. No public exploit code has been released.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Refer to Qualcomm December 2021 security bulletin for specific patched versions
Vendor Advisory: https://www.qualcomm.com/company/product-security/bulletins/december-2021-bulletin
Restart Required: Yes
Instructions:
1. Check Qualcomm security bulletin for affected chipset models. 2. Contact device manufacturer for firmware updates. 3. Apply manufacturer-provided patches. 4. Reboot device after patching.
🔧 Temporary Workarounds
Network Segmentation
allIsolate affected devices from untrusted networks and limit network access to essential services only.
Least Privilege Access
allImplement strict access controls and limit user privileges on affected devices.
🧯 If You Can't Patch
- Isolate affected devices in dedicated network segments with strict firewall rules
- Implement application allowlisting and monitor for suspicious process execution
🔍 How to Verify
Check if Vulnerable:
Check device chipset model and firmware version against Qualcomm's security bulletin. Use 'cat /proc/cpuinfo' on Linux systems to identify chipset.Check Version:
cat /proc/cpuinfo | grep -i qualcomm && cat /proc/versionVerify Fix Applied:
Verify firmware version has been updated to patched version specified by device manufacturer. Check patch status in device security settings.📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs
- Access control violation logs
- Unexpected process execution with elevated privileges
Network Indicators:
- Unusual outbound connections from embedded devices
- Anomalous network traffic patterns from IoT devices
SIEM Query:
source="kernel" AND ("panic" OR "oops") AND "qualcomm" OR source="security" AND "access_control" AND "violation"