CVE-2019-15348 : Security Advisory and Response

A vulnerability in the Tecno Camon Android device allows a third-party app to execute commands as the system user, leading to unauthorized access and control over various device functions.

Understanding CVE-2019-15348

This CVE describes a critical security issue in the Tecno Camon Android device that enables malicious apps to gain elevated privileges and perform unauthorized actions.

What is CVE-2019-15348?

The Tecno Camon Android device, specifically the one with the build fingerprint of TECNO/H612/TECNO-ID5a:8.1.0/O11019/F-180828V106:user/release-keys, contains a pre-installed platform app with a package name of com.lovelyfont.defcontainer. This app includes an exported service that allows arbitrary commands to be executed as the system user, triggered by writing a specific message to the logcat log.

The Impact of CVE-2019-15348

Unauthorized capabilities for third-party apps include video recording the user's screen, factory resetting the device, accessing notifications, reading logcat logs, injecting events in the GUI, and obtaining text messages.
Malicious apps can change the default Input Method Editor with keylogging functionality and perform various other actions.

Technical Details of CVE-2019-15348

This section provides more in-depth technical insights into the vulnerability.

Vulnerability Description

The vulnerability allows any co-located app on the device to supply shell script commands to execute as the system user, leading to unauthorized access and control over the device.

Affected Systems and Versions

Product: Tecno Camon Android device
Vendor: Tecno
Version: TECNO/H612/TECNO-ID5a:8.1.0/O11019/F-180828V106:user/release-keys

Exploitation Mechanism

The attack can be carried out by a zero-permission app, and the commands are triggered by writing a specific message to the logcat log.

Mitigation and Prevention

Protecting against this vulnerability requires immediate actions and long-term security practices.

Immediate Steps to Take

Avoid installing apps from untrusted sources.
Regularly monitor device activities for suspicious behavior.

Long-Term Security Practices

Keep the device software up to date with the latest security patches.
Implement app permission restrictions to limit access to sensitive device functions.

Patching and Updates

Check for and apply security updates provided by the device manufacturer.