CVE-2023-46768
📋 TL;DR
A use-after-free vulnerability (CWE-416) in the idmap module of Huawei HarmonyOS and EMUI systems allows attackers to cause abnormal feature behavior through multi-thread exploitation. This affects Huawei smartphones, tablets, and other devices running vulnerable HarmonyOS/EMUI versions. The vulnerability could potentially lead to denial of service or other system instability.
💻 Affected Systems
- Huawei smartphones
- Huawei tablets
- Huawei devices running HarmonyOS/EMUI
📦 What is this software?
Emui by Huawei
Harmonyos by Huawei
Harmonyos by Huawei
Harmonyos by Huawei
⚠️ Risk & Real-World Impact
Worst Case
System crash, denial of service, or potential privilege escalation leading to complete device compromise
Likely Case
Application or system feature malfunction, instability, or crashes affecting user experience
If Mitigated
Minor performance issues or isolated application failures if proper isolation exists
🎯 Exploit Status
Requires multi-threaded exploitation and local access; no public exploits known
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Security update versions specified in Huawei November 2023 bulletins
Vendor Advisory: https://consumer.huawei.com/en/support/bulletin/2023/11/
Restart Required: Yes
Instructions:
1. Check for system updates in device Settings 2. Install latest security update 3. Restart device 4. Verify update applied successfully
🔧 Temporary Workarounds
Disable unnecessary apps
allReduce attack surface by disabling unused applications that might trigger the vulnerability
Restrict app permissions
allLimit app permissions to minimum required functionality
🧯 If You Can't Patch
- Isolate affected devices from critical networks
- Implement application allowlisting to prevent malicious app installation
🔍 How to Verify
Check if Vulnerable:
Check device security patch level in Settings > About phone > Build numberCheck Version:
Settings > About phone > Build number (no CLI command available)Verify Fix Applied:
Verify security patch date is November 2023 or later in device settings📡 Detection & Monitoring
Log Indicators:
- System crashes
- Application force closes
- Kernel panic logs
- Idmap module errors
Network Indicators:
- Unusual device behavior patterns
- Multiple application failures
SIEM Query:
Device logs containing 'idmap' errors or multiple application crash events🔗 References
- https://consumer.huawei.com/en/support/bulletin/2023/11/
- https://device.harmonyos.com/en/docs/security/update/security-bulletins-202311-0000001729189597
- https://consumer.huawei.com/en/support/bulletin/2023/11/
- https://device.harmonyos.com/en/docs/security/update/security-bulletins-202311-0000001729189597
