CVE-2021-1914
📋 TL;DR
CVE-2021-1914 is an infinite loop vulnerability in Qualcomm Snapdragon chipsets where improper handling of unsupported input can cause a denial of service condition. This affects various Snapdragon platforms including Auto, Compute, Connectivity, Consumer IoT, Industrial IoT, IoT, Voice & Music, and Wearables. Attackers could potentially crash affected devices or cause resource exhaustion.
💻 Affected Systems
- Snapdragon Auto
- Snapdragon Compute
- Snapdragon Connectivity
- Snapdragon Consumer IOT
- Snapdragon Industrial IOT
- Snapdragon IoT
- Snapdragon Voice & Music
- Snapdragon Wearables
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device crash or permanent denial of service requiring physical reset, potentially leading to system instability in critical infrastructure or automotive systems.
Likely Case
Temporary denial of service causing device reboot or application crashes, disrupting normal operations.
If Mitigated
Minimal impact with proper input validation and monitoring in place, potentially causing only localized application failures.
🎯 Exploit Status
Exploitation requires sending specific malformed input to trigger the infinite loop condition; complexity depends on access to vulnerable interfaces.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Refer to device manufacturer firmware updates; Qualcomm provided fixes to OEMs
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 manufacturer-provided firmware patches. 3. Reboot device after update. 4. Verify patch installation through version checks.
🔧 Temporary Workarounds
Input Validation Enhancement
allImplement additional input validation at application layer to filter potentially malicious inputs before reaching vulnerable chipset components.
Resource Monitoring
linuxMonitor system resources and implement watchdog timers to detect and recover from potential infinite loop conditions.
🧯 If You Can't Patch
- Isolate affected devices from untrusted networks and limit exposure to potential attack vectors.
- Implement strict input validation in all applications interfacing with chipset components.
🔍 How to Verify
Check if Vulnerable:
Check device firmware version against manufacturer security bulletins; examine system logs for unexpected reboots or resource exhaustion events.Check Version:
Device-specific commands vary by manufacturer; typically 'getprop ro.build.version.security_patch' for Android or manufacturer-specific firmware check utilities.Verify Fix Applied:
Verify firmware version matches manufacturer's patched version; monitor system stability and absence of related crash events.📡 Detection & Monitoring
Log Indicators:
- Unexpected device reboots
- Kernel panic logs
- Resource exhaustion warnings
- Watchdog timeout events
Network Indicators:
- Unusual input patterns to device services
- Protocol anomalies in chipset communication
SIEM Query:
Search for: (event_category="system_reboot" OR event_category="kernel_panic") AND device_type="snapdragon"