CVE-2023-37242
📋 TL;DR
This vulnerability allows attackers to intercept modem commands in the atcmdserver module on affected Huawei devices. Attackers can exploit this to rewrite NVRAM or chain with other vulnerabilities for further compromise. Affected systems include Huawei smartphones and tablets running HarmonyOS.
💻 Affected Systems
- Huawei smartphones
- Huawei tablets
📦 What is this software?
Emui by Huawei
Emui by Huawei
Harmonyos by Huawei
Harmonyos by Huawei
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise including persistent malware installation, data theft, and device bricking through NVRAM corruption.
Likely Case
Local privilege escalation leading to unauthorized access to sensitive device functions and data.
If Mitigated
Limited impact if devices are patched and network access is restricted.
🎯 Exploit Status
Exploitation requires local access or ability to execute code on the device. The vulnerability facilitates privilege escalation rather than initial access.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: HarmonyOS security patch July 2023 or later
Vendor Advisory: https://consumer.huawei.com/en/support/bulletin/2023/7/
Restart Required: Yes
Instructions:
1. Check for system updates in device settings. 2. Install the July 2023 security patch or later. 3. Restart the device after installation.
🔧 Temporary Workarounds
Disable unnecessary modem services
allRestrict access to atcmdserver module if not required for device functionality
🧯 If You Can't Patch
- Restrict physical and network access to vulnerable devices
- Implement application allowlisting to prevent unauthorized code execution
🔍 How to Verify
Check if Vulnerable:
Check HarmonyOS version in Settings > About phone > HarmonyOS version. If version is prior to July 2023 security patch, device is vulnerable.Check Version:
Not applicable - check through device settings UIVerify Fix Applied:
Verify HarmonyOS version shows July 2023 security patch or later in Settings > About phone > HarmonyOS version.📡 Detection & Monitoring
Log Indicators:
- Unusual atcmdserver activity
- Unexpected NVRAM write operations
Network Indicators:
- Suspicious local network traffic to modem services
SIEM Query:
Not applicable - device-level vulnerability🔗 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
