CVE-2021-46851 Explained : Impact and Mitigation

A vulnerability in the DRM module of Huawei's HarmonyOS and EMUI platforms that could lead to abnormal video playback.

Understanding CVE-2021-46851

What is CVE-2021-46851?

The vulnerability lies in the DRM module's insecure verification of secure memory attributes, potentially enabling attackers to disrupt video playback.

The Impact of CVE-2021-46851

Exploitation of this vulnerability may result in abnormal behavior during video playback on affected devices, compromising user experience and potentially leading to further security risks.

Technical Details of CVE-2021-46851

Vulnerability Description

The vulnerability is centered around improper verification of secure memory attributes within the DRM module, providing a weakness that attackers can exploit.

Affected Systems and Versions

Huawei HarmonyOS 2.0 is confirmed to be impacted by the vulnerability.
Huawei EMUI version 12.0.0 is also affected.

Exploitation Mechanism

Attackers can exploit the vulnerability by manipulating the insecure verification process of secure memory attributes in the DRM module, causing disruptions in video playback.

Mitigation and Prevention

Immediate Steps to Take

Update affected Huawei devices to the latest firmware version that contains security patches.
Avoid visiting suspicious websites or clicking on unknown links to reduce the risk of exploitation.

Long-Term Security Practices

Regularly check for and apply security updates provided by Huawei to mitigate known vulnerabilities.
Implement network segmentation and access controls to limit the impact of potential exploitation.

Patching and Updates

Ensure that devices running Huawei HarmonyOS and EMUI receive timely security updates from Huawei to address the vulnerability and enhance overall system security.