CVE-2017-0562

Vulnerability

CVE-2017-0562 is an elevation of privilege vulnerability in the MediaTek touchscreen driver used in Android devices. The issue allows a local malicious application to execute arbitrary code within the kernel context. This vulnerability affects Android devices using the MediaTek touchscreen driver, as referenced in Android Security Bulletin—April 2017 [1]. The driver's handling of certain operations contains a flaw that can be triggered by a crafted application, leading to memory corruption or other kernel-level compromise.

Exploitation

An attacker must have the ability to install a malicious application on the target Android device. No additional privileges or user interaction beyond installing the app is required. The application can then issue specific commands to the MediaTek touchscreen driver, exploiting the vulnerability to achieve arbitrary code execution in the kernel. The exact sequence of steps involves crafting inputs that trigger the driver's flaw, resulting in kernel memory corruption and control flow hijacking [1].

Impact

Successfully exploiting this vulnerability enables the attacker to execute arbitrary code at the kernel level. This could lead to permanent compromise of the device, potentially requiring a full OS reflash to repair. The attack can achieve root privileges, allowing full control over the device's operating system, including access to sensitive data, modification of system files, and installation of persistent malware.

Mitigation

Google released a fix as part of the Android Security Bulletin—April 2017 [1]. The patch addresses the vulnerability in the MediaTek touchscreen driver. Users should ensure their devices receive the April 2017 or later security update. For unpatched devices, no workaround is available; the only mitigation is to apply the vendor-provided update.