CVE-2025-27128
📋 TL;DR
CVE-2025-27128 is a use-after-free vulnerability in OpenHarmony's tcb (Trusted Computing Base) component that allows local attackers to execute arbitrary code with elevated privileges. This affects OpenHarmony v5.0.3 and earlier versions. Attackers need local access to exploit this vulnerability.
💻 Affected Systems
- OpenHarmony
📦 What is this software?
Openharmony by Openatom
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with root-level privileges, allowing attackers to install persistent malware, steal sensitive data, or disrupt system operations.
Likely Case
Local privilege escalation enabling attackers to bypass security controls, access restricted resources, or maintain persistence on compromised systems.
If Mitigated
Limited impact if proper access controls and privilege separation are implemented, though local attackers could still gain elevated privileges.
🎯 Exploit Status
Exploitation requires local access and understanding of tcb memory management. Use-after-free vulnerabilities typically require specific timing and memory manipulation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: OpenHarmony v5.0.4 or later
Vendor Advisory: https://gitee.com/openharmony/security/blob/master/zh/security-disclosure/2025/2025-07.md
Restart Required: Yes
Instructions:
1. Check current OpenHarmony version. 2. Update to v5.0.4 or later via official channels. 3. Reboot the system to apply the patch. 4. Verify the update was successful.
🔧 Temporary Workarounds
Restrict local access
allLimit physical and remote local access to vulnerable systems to reduce attack surface
Implement strict privilege separation
allUse minimal privilege principles and separate user accounts to limit damage if exploited
🧯 If You Can't Patch
- Isolate affected systems from critical networks and sensitive data
- Implement enhanced monitoring for privilege escalation attempts and unusual tcb activity
🔍 How to Verify
Check if Vulnerable:
Check OpenHarmony version: cat /etc/openharmony_version or equivalent system commandCheck Version:
cat /etc/openharmony_version || hdc shell getprop ro.build.version.ohosVerify Fix Applied:
Verify version is v5.0.4 or later and check for any security updates applied to tcb component📡 Detection & Monitoring
Log Indicators:
- Unusual tcb process activity
- Privilege escalation attempts
- Memory access violations in tcb logs
Network Indicators:
- Not applicable - local exploit only
SIEM Query:
Process: tcb AND (EventID: PrivilegeEscalation OR MemoryViolation)