CVE-2016-6707 in Android
Summary
by MITRE
An elevation of privilege vulnerability in System Server in Android 6.x before 2016-11-01 and 7.0 before 2016-11-01 could enable a local malicious application to execute arbitrary code within the context of a privileged process. This issue is rated as High because it could be used to gain local access to elevated capabilities, which are not normally accessible to a third-party application. Android ID: A-31350622.
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Analysis
by VulDB Data Team • 06/11/2024
The vulnerability described in CVE-2016-6707 represents a critical elevation of privilege flaw within the Android system server component affecting versions 6.x and 7.0 prior to November 1, 2016. This weakness resides in the core system services that manage privileged operations and access controls, creating a pathway for malicious applications to bypass normal security boundaries. The issue stems from insufficient input validation and access control mechanisms within the system server's handling of privileged operations, allowing a locally installed application to escalate its privileges and execute code with elevated system-level permissions. Such vulnerabilities are particularly dangerous because they exploit the fundamental trust model of the operating system where legitimate system services are expected to maintain strict isolation from untrusted applications.
The technical implementation of this vulnerability involves a flaw in how the system server processes certain privileged operations or API calls that should only be accessible to system-level components. Attackers can leverage this weakness by crafting a malicious application that exploits the improper validation of input parameters or by manipulating the execution flow within the system server process. The vulnerability falls under CWE-276, which describes improper privilege management, and specifically relates to insufficient access control mechanisms that allow unauthorized code execution within privileged contexts. When exploited, the malicious application can gain access to system resources, modify critical system files, or establish persistent backdoors that would normally be restricted to legitimate system processes. This represents a classic example of a privilege escalation vulnerability where the attack surface is the system server itself, which typically operates with the highest privileges on the device.
The operational impact of CVE-2016-6707 extends far beyond simple local code execution, as it fundamentally compromises the security architecture of affected Android devices. Once exploited, the malicious application can perform actions such as installing additional malware, modifying system configurations, accessing sensitive user data, or disabling security features that protect the device. This vulnerability directly maps to ATT&CK technique T1068, which covers "Exploitation for Privilege Escalation," and T1059, covering "Command and Scripting Interpreter," as the attacker can leverage the elevated privileges to execute arbitrary commands and scripts. The high severity rating reflects the potential for complete device compromise, as the attacker can effectively bypass all standard application sandboxing mechanisms and gain access to the full range of system capabilities that should remain restricted to trusted system components.
Mitigation strategies for this vulnerability require immediate patching of affected Android versions through the regular security update cycle, as Google released fixes for this issue in their November 2016 security updates. Organizations and device users must ensure that all Android devices are updated to versions that contain the patched system server implementation, which includes enhanced input validation and stricter access control enforcement. Additionally, security administrators should implement monitoring for suspicious system behavior that might indicate exploitation attempts, particularly around privileged process access patterns and unusual system modifications. The vulnerability highlights the importance of maintaining up-to-date mobile security patches and demonstrates how system-level flaws can create persistent threats that remain exploitable until properly addressed through official security updates. Device manufacturers and carriers play a crucial role in ensuring timely delivery of these security patches to protect end users from exploitation of such critical privilege escalation vulnerabilities.