CVE-2024-27897
📋 TL;DR
This CVE describes an input verification vulnerability in the call module that could allow unauthorized access to sensitive information. The vulnerability affects Huawei devices running HarmonyOS, potentially exposing call-related data to attackers. Successful exploitation could compromise service confidentiality.
💻 Affected Systems
- Huawei devices with HarmonyOS
📦 What is this software?
Emui by Huawei
Emui by Huawei
Harmonyos by Huawei
Harmonyos by Huawei
Harmonyos by Huawei
Harmonyos by Huawei
⚠️ Risk & Real-World Impact
Worst Case
Attackers could intercept or access confidential call data, potentially exposing sensitive communications and personal information.
Likely Case
Unauthorized access to call metadata or limited call-related information, potentially enabling privacy violations.
If Mitigated
With proper input validation and access controls, the vulnerability would be prevented from being exploited.
🎯 Exploit Status
Exploitation requires specific conditions and access to the call module; no public exploit details available
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in references, but March 2024 security updates contain fixes
Vendor Advisory: https://consumer.huawei.com/en/support/bulletin/2024/3/
Restart Required: Yes
Instructions:
1. Check for available system updates in device settings. 2. Install the latest security update from March 2024 or later. 3. Restart the device after installation.
🔧 Temporary Workarounds
Disable unnecessary call features
allTemporarily disable non-essential call-related features that might be vulnerable
Network segmentation
allIsolate affected devices from untrusted networks
🧯 If You Can't Patch
- Implement strict access controls to limit who can access call functionality
- Monitor call module logs for unusual activity or access patterns
🔍 How to Verify
Check if Vulnerable:
Check device security patch level in settings; if before March 2024, likely vulnerableCheck Version:
Settings > System & updates > Software update (on HarmonyOS devices)Verify Fix Applied:
Verify security patch level shows March 2024 or later update installed📡 Detection & Monitoring
Log Indicators:
- Unusual call module access patterns
- Failed input validation attempts in call logs
Network Indicators:
- Unexpected call-related network traffic from unauthorized sources
SIEM Query:
source="call_module" AND (event_type="access_denied" OR event_type="input_validation_failure")🔗 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
