CVE-2019-15350 in Camon
Summary
by MITRE
The Tecno Camon Android device with a build fingerprint of TECNO/H622/TECNO-ID5b:8.1.0/O11019/G-180829V31:user/release-keys contains a pre-installed platform app with a package name of com.lovelyfont.defcontainer (versionCode=7, versionName=7.0.11). This app contains an exported service named com.lovelyfont.manager.service.FunctionService that allows any app co-located on the device to supply the file path to a Dalvik Executable (DEX) file which it will dynamically load within its own process and execute in with its own system privileges. This app cannot be disabled by the user and the attack can be performed by a zero-permission app. Executing commands as the system user can allow a third-party app to video record the user's screen, factory reset the device, obtain the user's notifications, read the logcat logs, inject events in the Graphical User Interface (GUI), and obtains the user's text messages, and more. Executing code as the system user can allow a third-party app to factory reset the device, obtain the user's Wi-Fi passwords, obtain the user's notifications, read the logcat logs, inject events in the GUI, change the default Input Method Editor (IME) (e.g., keyboard) with one contained within the attacking app that contains keylogging functionality, and obtains the user's text messages, and more.
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Analysis
by VulDB Data Team • 02/14/2024
This vulnerability exists in Tecno Camon Android devices with build fingerprint TECNO/H622/TECNO-ID5b:8.1.0/O11019/G-180829V31 where a pre-installed platform application named com.lovelyfont.defcontainer version 7.0.11 contains a critical security flaw. The application includes an exported service called com.lovelyfont.manager.service.FunctionService that exposes a dangerous functionality allowing any application on the device to provide a file path to a Dalvik Executable (DEX) file for dynamic loading and execution within the system process. This represents a fundamental violation of Android's security model as the service operates without requiring any permissions, making it accessible to any malicious application that might be co-located on the device.
The technical flaw stems from improper Android manifest configuration where the FunctionService component is exported without adequate security restrictions or permission checks. This allows arbitrary code execution with system-level privileges through the dynamic loading mechanism, creating a privilege escalation vulnerability that maps to CWE-276. The vulnerability is particularly concerning because the application cannot be disabled by users, rendering standard Android security controls ineffective against this threat. Attackers can exploit this flaw by simply placing a malicious DEX file on the device and invoking the exported service, bypassing all standard Android permission models and security boundaries.
The operational impact of this vulnerability is severe and encompasses a wide range of malicious capabilities that can be executed with system privileges. Third-party applications can perform screen recording to capture user activities, execute factory resets that can destroy user data, access notifications and logcat logs for sensitive information gathering, inject events into the graphical user interface to manipulate user interactions, and obtain text messages and other personal data. Additionally, the attacker can change the default input method editor to one containing keylogging functionality, enabling persistent monitoring of user input, and access Wi-Fi passwords for network reconnaissance and potential lateral movement within the network environment.
This vulnerability directly relates to several ATT&CK framework techniques including T1059.001 (Command and Scripting Interpreter: PowerShell), T1070.004 (Indicator Removal on Host: File Deletion), T1003.001 (Credential Dumping: LSASS Memory), T1056.001 (Input Capture: Keylogging), and T1482 (Domain Trust Discovery) as it provides the foundation for privilege escalation and persistent access to user data. The attack surface is particularly dangerous because it requires zero permissions to execute, making it extremely difficult to detect or prevent through standard Android security measures. Organizations should consider implementing device-level security controls, regular security assessments of pre-installed applications, and network monitoring for suspicious activities that might indicate exploitation attempts. The vulnerability highlights the critical importance of proper Android application security practices and the need for thorough security reviews of platform applications, particularly those with system-level access capabilities.