CVE-2025-27577
📋 TL;DR
This vulnerability allows a local attacker to execute arbitrary code with Trusted Computing Base (TCB) privileges through a race condition in OpenHarmony. Attackers can escalate privileges and potentially compromise the entire system. Only OpenHarmony v5.0.3 and earlier versions are affected.
💻 Affected Systems
- OpenHarmony
📦 What is this software?
Openharmony by Openatom
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with TCB-level privileges, allowing attackers to bypass all security controls, install persistent malware, access sensitive data, and control the entire device.
Likely Case
Local privilege escalation allowing attackers to gain elevated permissions, modify system files, and potentially pivot to other systems or users.
If Mitigated
Limited impact with proper access controls, but still represents a significant security risk requiring immediate patching.
🎯 Exploit Status
Exploitation requires local access and race condition timing, making it moderately complex but feasible for skilled attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: OpenHarmony v5.0.4 or later
Vendor Advisory: https://gitee.com/openharmony/security/blob/master/zh/security-disclosure/2025/2025-08.md
Restart Required: Yes
Instructions:
1. Check current OpenHarmony version. 2. Update to OpenHarmony v5.0.4 or later through official channels. 3. Reboot the system after update. 4. Verify the update was successful.
🔧 Temporary Workarounds
Restrict local user access
allLimit local user accounts and implement strict access controls to reduce attack surface
Implement process isolation
allUse containerization or sandboxing to isolate processes and limit privilege escalation impact
🧯 If You Can't Patch
- Implement strict access controls and limit local user accounts to trusted personnel only
- Monitor system logs for unusual privilege escalation attempts and suspicious process behavior
🔍 How to Verify
Check if Vulnerable:
Check OpenHarmony version: If version is 5.0.3 or earlier, the system is vulnerable.Check Version:
uname -a or check system settings for OpenHarmony versionVerify Fix Applied:
Verify OpenHarmony version is 5.0.4 or later after applying the update.📡 Detection & Monitoring
Log Indicators:
- Unusual privilege escalation attempts
- Multiple rapid process creation/deletion
- TCB-related access violations
Network Indicators:
- Not applicable - local vulnerability
SIEM Query:
Search for process creation events with unusual parent-child relationships or rapid privilege changes