CVE-2023-52549
📋 TL;DR
This CVE describes a data verification error vulnerability in a kernel module that could allow attackers to bypass security checks. Successful exploitation may lead to unauthorized access to sensitive information, affecting service confidentiality. This primarily affects Huawei devices running HarmonyOS.
💻 Affected Systems
- Huawei devices with HarmonyOS kernel modules
📦 What is this software?
Emui by Huawei
Emui by Huawei
Harmonyos by Huawei
Harmonyos by Huawei
Harmonyos by Huawei
Harmonyos by Huawei
Harmonyos by Huawei
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of kernel memory leading to information disclosure, privilege escalation, or system instability.
Likely Case
Information disclosure of kernel memory contents, potentially exposing sensitive data or system information.
If Mitigated
Limited impact with proper kernel hardening and access controls in place.
🎯 Exploit Status
Exploitation requires kernel module access and understanding of the specific data verification flaw.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Refer to Huawei security bulletins for specific patched versions
Vendor Advisory: https://consumer.huawei.com/en/support/bulletin/2024/3/
Restart Required: Yes
Instructions:
1. Check Huawei security bulletins for affected devices. 2. Apply the latest security updates from Huawei. 3. Reboot device to load patched kernel.
🔧 Temporary Workarounds
Kernel module unloading
linuxUnload the vulnerable kernel module if not required for system operation
rmmod <vulnerable_module_name>
Kernel hardening
linuxEnable kernel security features like SELinux/AppArmor to limit module capabilities
setenforce 1
apparmor_parser -r /etc/apparmor.d/*
🧯 If You Can't Patch
- Implement strict access controls to limit who can load kernel modules
- Monitor kernel module loading/unloading activities and audit logs for suspicious behavior
🔍 How to Verify
Check if Vulnerable:
Check HarmonyOS version against Huawei security bulletins and verify if vulnerable kernel modules are loadedCheck Version:
getprop ro.build.version.harmonyVerify Fix Applied:
Verify HarmonyOS version is updated to patched version and vulnerable kernel modules are no longer present or updated📡 Detection & Monitoring
Log Indicators:
- Unexpected kernel module loads
- Kernel panic or oops messages
- Permission denied errors for kernel operations
Network Indicators:
- None - this is a local kernel vulnerability
SIEM Query:
source="kernel" AND ("module load" OR "verification error" OR "buffer overflow")🔗 References
- https://consumer.huawei.com/en/support/bulletin/2024/3/
- https://device.harmonyos.com/en/docs/security/update/security-bulletins-202403-0000001667644725
- https://consumer.huawei.com/en/support/bulletin/2024/3/
- https://device.harmonyos.com/en/docs/security/update/security-bulletins-202403-0000001667644725
