CVE-2016-6672 in Android
Summary
by MITRE
The Synaptics touchscreen driver in Android before 2016-10-05 on Nexus 5X devices allows attackers to gain privileges via a crafted application, aka internal bug 30537088.
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Analysis
by VulDB Data Team • 05/01/2019
The vulnerability identified as CVE-2016-6672 represents a critical privilege escalation flaw within the Synaptics touchscreen driver component of Android operating systems. This issue specifically affects Nexus 5X devices and exists in Android versions prior to the October 5, 2016 security update. The vulnerability stems from improper input validation and access control mechanisms within the touchscreen driver implementation, creating a pathway for malicious applications to elevate their privileges from standard user level to system-level access. The flaw is particularly concerning as it allows attackers to exploit the driver through a crafted application without requiring physical access or additional attack vectors, making it a significant concern for device security.
The technical nature of this vulnerability aligns with CWE-264, which describes permissions, privileges, and access control weaknesses in software implementations. The Synaptics touchscreen driver operates at a low system level where it interfaces directly with hardware components and maintains elevated privileges to process touch input events. The flaw occurs when the driver fails to properly validate input parameters or enforce proper access controls during the processing of touchscreen events. This allows a malicious application to manipulate driver behavior through crafted input sequences or memory corruption techniques that ultimately result in privilege escalation. The vulnerability operates at the kernel level where the touchscreen driver executes with system privileges, making any exploitation directly impactful to the entire device security posture.
From an operational impact perspective, this vulnerability creates a severe threat landscape for affected Nexus 5X devices as it enables attackers to gain complete system control without user interaction or device compromise. Once successfully exploited, the malicious application could access all device data, modify system files, install additional malware, and potentially disable security mechanisms. The attack vector is particularly dangerous because it requires no special privileges or physical access to the device, making it a prime target for remote exploitation. The vulnerability essentially allows attackers to bypass the Android security model's fundamental principle of application sandboxing, where applications should operate with limited privileges and cannot access system resources without proper authorization.
The threat landscape for this vulnerability extends beyond simple privilege escalation to encompass broader security implications within the Android ecosystem. Attackers could leverage this flaw to establish persistent backdoors, extract sensitive user data, or deploy additional malicious payloads that would otherwise be prevented by normal security restrictions. The vulnerability also demonstrates the risks associated with third-party driver components in mobile operating systems, where hardware-specific implementations can introduce security gaps that affect the entire platform. Security researchers have noted that such driver-level vulnerabilities often remain undetected for extended periods due to the complexity of kernel-level code and the limited testing scenarios that occur during normal software development cycles.
Mitigation strategies for CVE-2016-6672 primarily involve applying the Android security patch released on October 5, 2016, which addresses the privilege escalation vulnerability in the Synaptics touchscreen driver. System administrators and device users should immediately update their Nexus 5X devices to the latest Android version that includes the patched driver component. Additionally, organizations should implement application whitelisting policies to prevent installation of untrusted applications that could potentially exploit this vulnerability. The vulnerability also underscores the importance of maintaining up-to-date security patches across all mobile devices, particularly those running older Android versions where such kernel-level vulnerabilities may persist. Network monitoring solutions should be configured to detect anomalous behavior that might indicate exploitation attempts, while endpoint protection systems should be enhanced to identify potentially malicious applications attempting to access driver interfaces. This vulnerability serves as a reminder of the critical need for comprehensive security testing of driver components and the importance of timely patch deployment to maintain device security integrity.