CVE-2019-25568: Memu Play

Overview

A critical security vulnerability, identified as CVE-2019-25568, has been discovered in MEmu Play version 6.0.7. This flaw is an insecure file permissions vulnerability that allows a user with standard, low-privilege access to a Windows system to escalate their privileges to the highest level (SYSTEM). This type of local attack can lead to a complete compromise of the affected computer.

Vulnerability Details

In simple terms, the MEmu Play Android emulator software was installed with overly permissive file security settings. The core service executable, MemuService.exe, located in the program’s installation directory, could be modified by any user on the system. An attacker with local access can exploit this by renaming the legitimate file and placing a malicious executable with the same name in its place. When the computer is restarted, or the MEmu service is stopped and started, the Windows operating system automatically executes the malicious file with SYSTEM-level privileges, giving the attacker full control over the machine.

Potential Impact

The impact of this vulnerability is severe. Successful exploitation allows an attacker to:

• Gain complete administrative (SYSTEM) control of the Windows host.
• Install persistent malware, such as ransomware or spyware.
• Steal sensitive data, disable security software, or create new user accounts.
• Use the compromised machine as a foothold to attack other systems on the network.

This flaw is particularly dangerous in shared or corporate environments where multiple users have standard accounts on the same workstation. For more on the consequences of system compromise, you can review real-world incidents in our breach reports.

Remediation and Mitigation

Immediate action is required to secure systems running the affected software.

Primary Remediation:

1. Update Immediately: Check for and install the latest version of MEmu Play from the official vendor website. The vendor has addressed this vulnerability in subsequent releases.
2. Uninstall if Unused: If the software is no longer required, completely uninstall MEmu Play 6.0.7 from affected systems.

Temporary Mitigation (if update is delayed):

• Manually adjust the NTFS file permissions on the MemuService.exe file and its parent directory to restrict write access to only authorized administrators. This is a technical stopgap and updating remains the definitive solution.

General Security Advice:

• Adhere to the principle of least privilege for user accounts in your environment.
• Maintain a regular patch management schedule for all software. Stay informed about emerging threats by following the latest security news.

Organizations should audit their networks for the presence of MEmu Play 6.0.7 and apply the update as a critical priority to prevent potential privilege escalation attacks.