CVE-2019-2023 : Security Advisory and Response

Android ServiceManager::add function vulnerability allows for elevation of privilege on Android 8.0, 8.1, and 9.

Understanding CVE-2019-2023

This CVE involves a security vulnerability in the ServiceManager::add function within the hardware service manager on Android devices.

What is CVE-2019-2023?

The vulnerability arises from an inadequately implemented permissions check based on the PID of the caller. This flaw could enable an application to introduce its own service, potentially overwriting or substituting a HAL service. This could grant the application the ability to execute code within a higher-privileged process.

The Impact of CVE-2019-2023

The vulnerability affects Android versions 8.0, 8.1, and 9. It has been assigned the Android ID A-121035042 and has implications for the upstream kernel.

Technical Details of CVE-2019-2023

The following technical details provide insight into the vulnerability and its implications.

Vulnerability Description

The ServiceManager::add function in the hardware service manager lacks a robust permissions check, allowing for potential elevation of privilege.

Affected Systems and Versions

Product: Android
Versions: Android-8.0, Android-8.1, Android-9

Exploitation Mechanism

The vulnerability could be exploited by an application to introduce its own service and gain code execution in a higher-privileged process.

Mitigation and Prevention

To address CVE-2019-2023, consider the following mitigation strategies.

Immediate Steps to Take

Apply security patches provided by the vendor promptly.
Monitor for any unusual behavior on the affected systems.

Long-Term Security Practices

Implement the principle of least privilege to restrict access rights for applications.
Regularly update and patch systems to address known vulnerabilities.

Patching and Updates

Regularly check for security updates and patches from the vendor to mitigate the risk of exploitation.