CVE-2021-39635 : What You Need to Know

CVE-2021-39635, assigned to ims_ex service in Android SoC devices, poses a risk of elevation of privilege due to insufficient permission verification.

Understanding CVE-2021-39635

CVE-2021-39635 is a vulnerability in the ims_ex vendor system service utilized for VoLTE management in Android SoC devices.

What is CVE-2021-39635?

The ims_ex service in Android SoC devices lacks proper permission validation, enabling unauthorized apps to access sensitive VoLTE information and control VoLTE calls.

The Impact of CVE-2021-39635

The vulnerability may lead to an elevation of privilege, allowing malicious apps to exploit VoLTE functionalities without proper authorization.

Technical Details of CVE-2021-39635

The technical aspects of this CVE include:

Vulnerability Description

ims_ex service in Android SoC devices lacks caller permission validation, enabling unauthorized access to VoLTE functionalities.

Affected Systems and Versions

Product: Android
Versions: Android SoC

Exploitation Mechanism

Normal apps without phone permissions can access VoLTE sensitive information and manipulate VoLTE calls.

Mitigation and Prevention

To safeguard systems from CVE-2021-39635, follow these steps:

Immediate Steps to Take

Regularly monitor and restrict app permissions.
Update Android devices to the latest security patches.

Long-Term Security Practices

Enhance app security by implementing proper permission checks.
Conduct regular security audits to identify and address vulnerabilities.

Patching and Updates

Stay informed about security advisories and promptly apply relevant patches to address known vulnerabilities.