CVE-2021-35100
📋 TL;DR
This vulnerability is a buffer over-read in Qualcomm Snapdragon chipsets when parsing ID3 tags in media files. It allows attackers to read memory beyond allocated buffers, potentially exposing sensitive information. Affected devices include smartphones, wearables, automotive systems, and IoT devices using vulnerable Snapdragon components.
💻 Affected Systems
- Snapdragon Auto
- Snapdragon Compute
- Snapdragon Connectivity
- Snapdragon Consumer IOT
- Snapdragon Industrial IOT
- Snapdragon Mobile
- Snapdragon Voice & Music
- Snapdragon Wearables
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, data theft, or persistent backdoor installation.
Likely Case
Information disclosure through memory leaks, potentially exposing sensitive data like encryption keys or user information.
If Mitigated
Denial of service through application crashes or limited information disclosure if memory protections are enabled.
🎯 Exploit Status
Exploitation requires crafting malicious media files with specially crafted ID3 tags. No public exploit code is known, but the vulnerability is in widely deployed hardware.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Refer to device manufacturer updates - Qualcomm has provided fixes to OEM partners.
Vendor Advisory: https://www.qualcomm.com/company/product-security/bulletins/april-2022-bulletin
Restart Required: Yes
Instructions:
1. Check with device manufacturer for security updates. 2. Apply available firmware/OS updates. 3. For embedded systems, contact Qualcomm or OEM for patched firmware images. 4. Reboot device after update installation.
🔧 Temporary Workarounds
Restrict media file sources
allLimit media file processing to trusted sources only
Disable automatic media parsing
allConfigure applications to not automatically parse media metadata
🧯 If You Can't Patch
- Network segmentation to isolate vulnerable devices from untrusted networks
- Implement application allowlisting to restrict which apps can process media files
🔍 How to Verify
Check if Vulnerable:
Check device firmware version against manufacturer security bulletins. Use 'getprop ro.build.fingerprint' on Android devices to check build information.Check Version:
Android: 'getprop ro.build.version.security_patch' or 'getprop ro.vendor.build.security_patch'Verify Fix Applied:
Verify security patch level is April 2022 or later. Check for Qualcomm security bulletin mentions in update notes.📡 Detection & Monitoring
Log Indicators:
- Media application crashes
- Kernel panic logs related to audio/video processing
- Memory access violation errors
Network Indicators:
- Unusual media file downloads from suspicious sources
- Multiple failed media parsing attempts
SIEM Query:
Process crashes with module names containing 'audio', 'media', or 'qcom' combined with memory access violation error codes