CVE-2023-37240
📋 TL;DR
CVE-2023-37240 is an out-of-bounds read vulnerability in Huawei's distributed file system caused by missing input length verification. Successful exploitation could allow attackers to read sensitive data from memory or cause system instability. This affects Huawei devices running HarmonyOS with the vulnerable distributed file system component.
💻 Affected Systems
- Huawei HarmonyOS devices with distributed file system
📦 What is this software?
Emui by Huawei
Emui by Huawei
Harmonyos by Huawei
Harmonyos by Huawei
Harmonyos by Huawei
⚠️ Risk & Real-World Impact
Worst Case
Information disclosure of sensitive memory contents, potential system crash leading to denial of service, or as a stepping stone for further exploitation.
Likely Case
Information disclosure of adjacent memory contents, potentially exposing sensitive data or causing application instability.
If Mitigated
Limited impact with proper network segmentation and access controls, though the vulnerability remains present.
🎯 Exploit Status
Exploitation requires sending specially crafted input to the distributed file system component. No public exploit code has been identified as of the advisory date.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: HarmonyOS security updates from July 2023 onward
Vendor Advisory: https://consumer.huawei.com/en/support/bulletin/2023/7/
Restart Required: Yes
Instructions:
1. Check for available updates in device settings. 2. Apply the latest HarmonyOS security update. 3. Restart the device as prompted. 4. Verify the update was successful.
🔧 Temporary Workarounds
Disable distributed file system
allTemporarily disable the distributed file system functionality if not required
Network segmentation
allRestrict network access to distributed file system services
🧯 If You Can't Patch
- Implement strict network access controls to limit exposure of distributed file system services
- Monitor for unusual file system access patterns or memory-related errors in logs
🔍 How to Verify
Check if Vulnerable:
Check HarmonyOS version in device settings. If version is prior to July 2023 security updates, the device is likely vulnerable.Check Version:
Settings > About phone > HarmonyOS versionVerify Fix Applied:
Verify HarmonyOS version is updated to include July 2023 security patches or later.📡 Detection & Monitoring
Log Indicators:
- Unusual file system access patterns
- Memory access violation errors
- Process crashes related to distributed file system
Network Indicators:
- Unusual network traffic to distributed file system ports
- Multiple failed file system operations
SIEM Query:
Process:distributed_file_system AND (EventID:memory_violation OR EventID:access_violation)🔗 References
- https://consumer.huawei.com/en/support/bulletin/2023/7/
- https://device.harmonyos.com/en/docs/security/update/security-bulletins-202307-0000001587168858
- https://consumer.huawei.com/en/support/bulletin/2023/7/
- https://device.harmonyos.com/en/docs/security/update/security-bulletins-202307-0000001587168858
