CVE-2025-64312: Huawei HarmonyOS Information Disclosure

CVE-2025-64312 Overview

CVE-2025-64312 is a permission control vulnerability in the file management module of Huawei HarmonyOS. This security flaw allows unauthorized access to sensitive data due to improper permission validation within the file management system. Successful exploitation of this vulnerability may affect service confidentiality, potentially exposing sensitive information to unauthorized parties.

Critical Impact

Exploitation of this permission control vulnerability can lead to unauthorized information disclosure, compromising the confidentiality of sensitive data stored on affected HarmonyOS devices.

Affected Products

• Huawei HarmonyOS 5.0.1
• Huawei HarmonyOS 5.1.0
• Huawei HarmonyOS 6.0.0

Discovery Timeline

• 2025-11-28 - CVE-2025-64312 published to NVD
• 2025-12-02 - Last updated in NVD database

Technical Details for CVE-2025-64312

Vulnerability Analysis

This vulnerability is classified under CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor), indicating that the file management module fails to properly enforce access controls when handling file operations. The vulnerability exists in the permission control mechanism of HarmonyOS's file management subsystem, where insufficient validation of user permissions allows unauthorized access to protected resources.

The flaw is remotely exploitable without requiring user interaction or authentication, making it particularly concerning for device security. An attacker can leverage this vulnerability to access confidential information that should be protected by the operating system's permission model.

Root Cause

The root cause of CVE-2025-64312 lies in improper permission validation within the file management module. The system fails to adequately verify whether a requesting entity has the appropriate privileges to access specific files or directories, resulting in a broken access control condition. This oversight allows unauthorized actors to bypass intended security restrictions and retrieve sensitive data.

Attack Vector

The attack vector for this vulnerability is network-based, requiring no privileges or user interaction for successful exploitation. An attacker could potentially craft malicious requests to the file management module that exploit the permission control weakness. The attack flow involves:

1. Identifying a target HarmonyOS device running a vulnerable version
2. Sending specially crafted requests to the file management module
3. Bypassing permission checks to access restricted file resources
4. Exfiltrating confidential information from the compromised system

The vulnerability manifests in the file management module's permission validation logic. For detailed technical information, refer to the Huawei Security Bulletin.

Detection Methods for CVE-2025-64312

Indicators of Compromise

• Unusual file access patterns from unauthorized processes or network sources
• Unexpected read operations on sensitive system files or directories
• Abnormal network traffic originating from the file management service
• Log entries indicating permission bypass attempts on protected resources

Detection Strategies

• Monitor file system access logs for anomalous permission escalation events
• Implement network traffic analysis to detect unauthorized data exfiltration patterns
• Deploy endpoint detection solutions to identify suspicious file management module activity
• Review system logs for failed and successful access attempts to restricted directories

Monitoring Recommendations

• Enable comprehensive logging for the file management module on HarmonyOS devices
• Configure alerts for unexpected file access from network-facing services
• Implement behavioral analysis to detect deviations from normal file access patterns
• Establish baseline file access metrics to identify anomalous activity

How to Mitigate CVE-2025-64312

Immediate Actions Required

• Update affected HarmonyOS devices to the latest patched version immediately
• Review and restrict network access to HarmonyOS devices where possible
• Audit file access permissions and remove unnecessary access rights
• Monitor affected systems for signs of exploitation until patches are applied

Patch Information

Huawei has addressed this vulnerability in their November 2025 security bulletin. Users should update their HarmonyOS devices to the latest available version that includes the security fix. Detailed patch information is available in the Huawei Security Bulletin.

To apply the update:

1. Navigate to Settings > System & updates > Software update
2. Check for available updates
3. Download and install the latest security patch
4. Restart the device to complete the installation

Workarounds

• Limit network exposure of affected HarmonyOS devices by placing them behind firewalls
• Disable or restrict access to non-essential file management services temporarily
• Implement network segmentation to isolate affected devices from sensitive resources
• Enable strict permission monitoring and alerting until patches can be applied

# Network-level mitigation: Restrict access to affected devices
# Example firewall rule to limit external access
iptables -A INPUT -p tcp --dport <file_service_port> -s <trusted_network> -j ACCEPT
iptables -A INPUT -p tcp --dport <file_service_port> -j DROP