CVE-2020-9158
📋 TL;DR
A missing cryptographic step vulnerability in Huawei smartphones allows attackers to cause denial of service (DoS) to the Samgr service. This affects Huawei smartphone users running vulnerable software versions. The vulnerability can be exploited to disrupt system management functionality.
💻 Affected Systems
- Huawei smartphones
📦 What is this software?
Emui by Huawei
Emui by Huawei
Emui by Huawei
Emui by Huawei
Emui by Huawei
Emui by Huawei
Emui by Huawei
Emui by Huawei
Magic Ui by Huawei
Magic Ui by Huawei
Magic Ui by Huawei
Magic Ui by Huawei
Magic Ui by Huawei
⚠️ Risk & Real-World Impact
Worst Case
Complete DoS of Samgr service, potentially disrupting device management, service registration, and system functionality requiring Samgr.
Likely Case
Temporary service disruption affecting specific system management functions until service restart.
If Mitigated
Minimal impact with proper patching and security controls in place.
🎯 Exploit Status
Exploitation requires local access or malicious app execution. No public exploit code identified from provided references.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Huawei security bulletin for specific patched versions
Vendor Advisory: https://consumer.huawei.com/en/support/bulletin/2021/1/
Restart Required: Yes
Instructions:
1. Check for security updates in device Settings > System & updates > Software update. 2. Install available security patches. 3. Restart device after update.
🔧 Temporary Workarounds
Restrict app installations
allOnly install apps from trusted sources like official app stores to reduce risk of malicious apps exploiting this vulnerability.
Disable unnecessary permissions
allReview and restrict app permissions, especially for apps that don't require system-level access.
🧯 If You Can't Patch
- Isolate device from untrusted networks and limit app installations to essential trusted applications only.
- Monitor device for unusual behavior or service disruptions that might indicate exploitation attempts.
🔍 How to Verify
Check if Vulnerable:
Check device software version in Settings > About phone > Build number and compare against Huawei security bulletins.Check Version:
No command-line option; use device Settings > About phone interface.Verify Fix Applied:
Verify security patch level in Settings > About phone > Build number matches or exceeds patched versions listed in Huawei advisories.📡 Detection & Monitoring
Log Indicators:
- Unexpected Samgr service crashes or restarts
- Error logs related to cryptographic operations in system services
Network Indicators:
- No specific network indicators as this is a local vulnerability
SIEM Query:
Not applicable for typical mobile device environments; monitor device logs for Samgr service anomalies if enterprise MDM solutions are deployed.