External risk intelligence

Huawei EMUI HarmonyOS Wi-Fi Module Out-of-Bounds Read Write Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2023-39405

The vulnerability exists in the Wi-Fi module of mobile operating systems (EMUI and HarmonyOS). Wi-Fi stack vulnerabilities generally require local proximity to the target device's wireless network, rather than being reachable via public-internet-facing services, web applications, or remote management gateways.

Out-of-bounds Write

Huawei Emui

11.0.112.0.012.0.113.0.02.0.02.0.12.1.03.0.0

Halo Surface Signal: 1 out of 5 — much less likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A vulnerability in the Wi-Fi module of Huawei's EMUI and HarmonyOS could allow other applications to execute with higher privileges. This issue, identified as a critical threat, arises from an out-of-bounds parameter read or write. The primary concern is to determine if our environment is affected by this technology.

  • Wi-Fi module flaw allows elevated app privileges.
  • Critical issue impacts specific Huawei operating systems.
  • Confirm relevance and exposure to this technology.

Attack Path

How an attacker could exploit the issue

An attacker could exploit a vulnerability within the Wi-Fi module of affected Huawei devices to gain unauthorized access. This could be achieved without any prior authentication or user interaction, potentially leading to the execution of other applications with elevated privileges.

  • No authentication or privileges needed.
  • Out-of-bounds read/write in Wi-Fi module.
  • Other apps executed with escalated privileges.

Live Threat

Current exploitation, exposure, and threat context

A vulnerability in the Wi-Fi module could allow other applications to execute with elevated permissions. This occurs due to an out-of-bounds read or write within the Wi-Fi component.

  • System integrity and other apps at risk.
  • Exploitation through network access.
  • Potential for unauthorized application execution.

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability in Huawei's EMUI and HarmonyOS Wi-Fi modules could allow for escalated privileges and execution of other applications. Responsibility likely falls to mobile device administrators and potentially the vendor management team to coordinate with Huawei. The initial step is to inventory all affected devices, assess their exposure, and determine business criticality to prioritize remediation efforts.

  • Mobile device and platform owners should manage this.
  • Verify affected device presence and reachability.
  • Plan remediation and coordinate with the vendor.

Supplementary metadata

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

Frequently asked questions

What is the Huawei EMUI and HarmonyOS software affected by CVE-2023-39405?

EMUI and HarmonyOS are mobile operating systems developed by Huawei for smartphones and tablets. These systems rely on a Wi-Fi module to manage wireless connectivity, which handles incoming and outgoing data packets between the device and local network hardware. This module is a core software component that runs continuously in the background to ensure your device stays connected to wireless networks.

How does an out-of-bounds read/write trigger CVE-2023-39405?

This vulnerability involves a memory safety issue classified as CWE-20 (Improper Input Validation) and CWE-787 (Out-of-bounds Write). Essentially, the Wi-Fi software fails to check the boundaries of data it processes, allowing information to be written or read outside of authorized memory areas. In CVE-2023-39405, this flaw can be leveraged to manipulate system memory, enabling an attacker to trick the OS into running unauthorized applications with higher privileges than they should have.

Do I need to be actively using Wi-Fi for this bug to be triggered?

While the vulnerability resides in the Wi-Fi module, it does not require the user to be actively browsing or transferring data to be triggered. However, the flaw is not triggered simply by the existence of the Wi-Fi hardware; it requires the device to be within range of an attacker capable of sending specifically crafted wireless network signals that the module will attempt to process.

Is CVE-2023-39405 a risk to my internet-facing web servers?

No. According to Halo Surface Signal, this vulnerability is not reachable via public-internet-facing services, web applications, or remote management gateways. It is a local network issue specific to mobile device Wi-Fi stacks. The risk is limited to physical or radio-frequency proximity where an attacker can communicate directly with the device's wireless module, rather than broad remote access over the internet.

What are the first steps to address this Huawei Wi-Fi vulnerability?

Your primary action is to identify all mobile devices in your environment running the affected versions of EMUI or HarmonyOS. Once identified, consult official Huawei security bulletins to determine if a vendor-provided software update is available for your specific device model. Coordinate with mobile device management teams to prioritize these updates, as patching the operating system is the standard way to fix vulnerabilities located within core components like the Wi-Fi module.

References