CVE-2021-35083
📋 TL;DR
This vulnerability allows attackers to read memory beyond intended boundaries due to improper certificate chain validation in Qualcomm Snapdragon chipsets. It affects devices using vulnerable Snapdragon components for SSL/TLS or Internet Key Exchange (IKE) operations. The impact includes potential information disclosure and system compromise.
💻 Affected Systems
- Snapdragon Auto
- Snapdragon Compute
- Snapdragon Connectivity
- Snapdragon Consumer Electronics Connectivity
- Snapdragon Consumer IOT
- Snapdragon Industrial IOT
- Snapdragon Mobile
- Snapdragon Voice & Music
- Snapdragon Wearables
📦 What is this software?
Sd7c Firmware by Qualcomm
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, data exfiltration, and persistent access to affected systems.
Likely Case
Information disclosure through memory leaks, potentially exposing sensitive data like encryption keys or credentials.
If Mitigated
Limited impact with proper network segmentation and certificate validation controls in place.
🎯 Exploit Status
Exploitation requires network access to trigger the certificate validation flaw; no public exploit code available as per advisory
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Refer to device manufacturer firmware updates
Vendor Advisory: https://www.qualcomm.com/company/product-security/bulletins/june-2022-bulletin
Restart Required: Yes
Instructions:
1. Check with device manufacturer for firmware updates. 2. Apply manufacturer-provided firmware patches. 3. Reboot device after patch installation. 4. Verify patch application through version checks.
🔧 Temporary Workarounds
Network Segmentation
allIsolate affected devices from untrusted networks to reduce attack surface
Certificate Pinning
allImplement certificate pinning in applications to enforce specific certificate validation
🧯 If You Can't Patch
- Implement strict network access controls and firewall rules
- Monitor for anomalous network traffic patterns and certificate validation failures
🔍 How to Verify
Check if Vulnerable:
Check device firmware version against manufacturer security bulletins; examine Qualcomm chipset model and firmware versionCheck Version:
Device-specific commands vary by manufacturer; typically 'cat /proc/version' or manufacturer-specific firmware check utilitiesVerify Fix Applied:
Verify firmware version has been updated to manufacturer-recommended secure version📡 Detection & Monitoring
Log Indicators:
- SSL/TLS handshake failures
- Certificate validation errors
- Memory access violation logs
Network Indicators:
- Unusual certificate chain presentations
- Abnormal IKE negotiation patterns
SIEM Query:
Search for SSL/TLS errors or certificate validation failures from Snapdragon-based devices