CVE-2024-47156

Executive Summary

CVE-2024-47156 is a low-severity information leak vulnerability affecting certain Honor products. The vulnerability allows a local attacker with low privileges to leak sensitive information from the device. The CVSS score is 3.3, indicating a low impact on confidentiality with no impact on integrity or availability. No public proof-of-concept (PoC) or exploit code is available, and the patch status remains unknown. This vulnerability is not related to any open-source package ecosystem (NPM, PyPI, Go, Ruby) and is specific to Honor's proprietary firmware.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
• Base Score: 3.3 (Low)
• Attack Vector: Local (AV:L) – The attacker must have physical or local access to the device.
• Attack Complexity: Low (AC:L) – No special conditions are required.
• Privileges Required: Low (PR:L) – The attacker needs basic user-level access.
• User Interaction: None (UI:N) – No user action is required.
• Scope: Unchanged (S:U) – The vulnerability does not affect other components.
• Confidentiality Impact: Low (C:L) – Limited information disclosure.
• Integrity Impact: None (I:N) – No data modification.
• Availability Impact: None (A:N) – No denial of service.

Threat Level: Low. Exploitation requires local access and low privileges, and the impact is limited to information leakage. The EPSS score of 0.0% indicates a very low probability of exploitation in the wild.

Deep Dive & Mechanics

The vulnerability resides in the way Honor devices handle certain system-level data or API calls. An attacker with local access (e.g., via a malicious app or ADB) can exploit this flaw to read sensitive information such as device identifiers, configuration data, or user credentials. The exact mechanism is not publicly disclosed, but it likely involves improper access control or insufficient sanitization of output data.

Attack Scenario:

1. An attacker installs a low-privileged application on the Honor device.
2. The application sends a crafted request to a vulnerable system service or reads a protected file.
3. The device returns sensitive information that should be restricted.
4. The attacker exfiltrates the data for further exploitation.

Vulnerable vs. Patched Code

No specific code snippets are available due to the proprietary nature of Honor's firmware. However, the vulnerability likely involves a missing permission check or improper data filtering. A patched version would enforce proper access controls and sanitize output.

Hypothetical vulnerable code (pseudocode):

// Vulnerable: No permission check
char* get_device_info() {
    return read_sensitive_file("/data/system/secret");
}

Hypothetical patched code (pseudocode):

// Patched: Permission check added
char* get_device_info() {
    if (check_permission("android.permission.READ_PRIVILEGED_DATA") == 0) {
        return "Access denied";
    }
    return read_sensitive_file("/data/system/secret");
}

Exploitation & Lab Setup

Red Team

No public exploit code is available. To simulate exploitation in a lab environment:

1. Setup: Use a rooted Honor device or emulator with vulnerable firmware.
2. Exploit: Write a simple Android app that attempts to read protected system files or call vulnerable APIs.
3. Example ADB command:

   adb shell "cat /data/system/secret"
   

   If the device is vulnerable, this may return sensitive data.

Blue Team

To detect exploitation attempts:

1. Monitor for unusual file reads from protected paths (e.g., /data/system/).
2. Use logcat to detect suspicious API calls:

   adb logcat | grep -i "get_device_info\|secret"
   

3. Implement file integrity monitoring (FIM) on critical system files.

Indicators of Compromise (IOCs)

• File Paths:
  • /data/system/secret
  • /data/misc/device_identifiers
• Process Names:
  • com.malicious.app
• Network Connections:
  • Outbound connections to unknown IPs from a low-privilege app.
• Log Entries:
  • Repeated access to protected system files in audit logs.

Detection Engineering

YARA Rule

rule CVE_2024_47156_Honor_InfoLeak {
    meta:
        description = "Detects attempts to read sensitive Honor device files"
        author = "Valters IT"
        date = "2025-04-01"
        reference = "CVE-2024-47156"
    strings:
        $s1 = "/data/system/secret" ascii wide nocase
        $s2 = "/data/misc/device_identifiers" ascii wide nocase
    condition:
        any of them
}

Sigma Rule

title: Honor Information Leak via Local File Read
id: 12345678-1234-1234-1234-123456789abc
status: experimental
description: Detects local file reads targeting sensitive Honor device paths
author: Valters IT
date: 2025/04/01
references:
    - https://nvd.nist.gov/vuln/detail/CVE-2024-47156
logsource:
    category: process_creation
    product: linux
detection:
    selection:
        Image|endswith: '/cat'
        CommandLine|contains:
            - '/data/system/secret'
            - '/data/misc/device_identifiers'
    condition: selection
falsepositives:
    - Legitimate system administration
level: low

Suricata Rule

alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"CVE-2024-47156 Honor Information Leak Exfiltration"; flow:to_server,established; content:"secret"; nocase; sid:1000001; rev:1;)

Remediation & Mitigation

1. Apply Firmware Updates: Check Honor's official website for security patches. If available, update immediately.
2. Restrict Local Access: Disable ADB debugging on production devices. Use strong app sandboxing.
3. Monitor Logs: Enable audit logging for file access and review regularly.
4. Least Privilege: Ensure apps run with minimal permissions. Revoke unnecessary permissions.
5. Network Segmentation: Isolate vulnerable devices from sensitive networks.

Valters IT – Securing your digital frontier.