CVE-2021-46885
📋 TL;DR
CVE-2021-46885 is a buffer overflow vulnerability in Huawei's video framework caused by addition overflow. Exploitation could allow attackers to overwrite memory and potentially crash affected systems, affecting availability. This impacts Huawei devices running vulnerable video framework components.
💻 Affected Systems
- Huawei smartphones and tablets with affected video framework
📦 What is this software?
Emui by Huawei
Emui by Huawei
Emui by Huawei
Emui by Huawei
Emui by Huawei
⚠️ Risk & Real-World Impact
Worst Case
Complete system crash or denial of service, potentially leading to device instability requiring reboot or factory reset.
Likely Case
Application crash or system instability affecting video functionality, with possible temporary denial of service.
If Mitigated
Limited impact with proper memory protections and exploit mitigations in place, potentially just application restart.
🎯 Exploit Status
Exploitation requires triggering the addition overflow condition in video processing, likely through specially crafted video files.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Huawei security updates for specific device models and versions
Vendor Advisory: https://consumer.huawei.com/en/support/bulletin/2023/5/
Restart Required: Yes
Instructions:
1. Check for security updates in device Settings > System & updates > Software update. 2. Install available updates. 3. Restart device after installation.
🔧 Temporary Workarounds
Disable untrusted video sources
allAvoid processing video files from untrusted sources to reduce attack surface
Use alternative video players
allUse third-party video applications with different codebases
🧯 If You Can't Patch
- Isolate affected devices from processing untrusted video content
- Implement application whitelisting to restrict video processing applications
🔍 How to Verify
Check if Vulnerable:
Check device model and software version against Huawei security bulletinsCheck Version:
Settings > About phone > Build number / Software versionVerify Fix Applied:
Verify software version after update matches patched versions in Huawei advisories📡 Detection & Monitoring
Log Indicators:
- Video framework crashes
- Memory corruption errors in system logs
- Application crashes related to video processing
Network Indicators:
- Unusual video file downloads to devices
- Attempts to trigger video processing from untrusted sources
SIEM Query:
source="android_system" AND (event="crash" OR event="segfault") AND process="video"