CVE-2024-39816
📋 TL;DR
This vulnerability allows a local attacker to execute arbitrary code in pre-installed apps on OpenHarmony devices through an out-of-bounds write. It affects OpenHarmony v4.1.0 and earlier versions, potentially compromising device security and user data.
💻 Affected Systems
- OpenHarmony
📦 What is this software?
Openharmony by Openatom
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attacker to install persistent malware, access sensitive data, and gain full system control.
Likely Case
Local privilege escalation allowing attacker to execute code with elevated permissions in pre-installed applications.
If Mitigated
Limited impact if proper app sandboxing and security controls prevent privilege escalation beyond the compromised app.
🎯 Exploit Status
Requires local access to the device and knowledge of the vulnerable component in pre-installed apps.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: OpenHarmony v4.1.1 or later
Vendor Advisory: https://gitee.com/openharmony/security/blob/master/zh/security-disclosure/2024/2024-09.md
Restart Required: Yes
Instructions:
1. Check current OpenHarmony version. 2. Update to v4.1.1 or later via official channels. 3. Reboot device after update. 4. Verify update was successful.
🔧 Temporary Workarounds
Restrict local access
allLimit physical and remote shell access to vulnerable devices
Disable unnecessary pre-installed apps
allReduce attack surface by disabling unused pre-installed applications
🧯 If You Can't Patch
- Implement strict access controls to prevent unauthorized local access
- Monitor for suspicious activity in pre-installed app logs and system behavior
🔍 How to Verify
Check if Vulnerable:
Check OpenHarmony version: if v4.1.0 or earlier, device is vulnerableCheck Version:
getprop ro.build.version.ohosVerify Fix Applied:
Verify OpenHarmony version is v4.1.1 or later after update📡 Detection & Monitoring
Log Indicators:
- Unusual memory access patterns in pre-installed apps
- Privilege escalation attempts
- Abnormal process creation from pre-installed apps
Network Indicators:
- None - local exploitation only
SIEM Query:
Process creation from pre-installed apps with unusual parent-child relationships OR memory access violations in system logs