CVE-2016-4675 in watchOS
Summary
by MITRE
An issue was discovered in certain Apple products. iOS before 10.1 is affected. macOS before 10.12.1 is affected. tvOS before 10.0.1 is affected. watchOS before 3.1 is affected. The issue involves the "libxpc" component. It allows attackers to execute arbitrary code in a privileged context via a crafted app.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 09/28/2022
The vulnerability identified as CVE-2016-4675 represents a critical privilege escalation flaw within Apple's operating systems affecting multiple platforms including iOS, macOS, tvOS, and watchOS. This vulnerability resides within the libxpc component which serves as a foundational messaging framework for inter-process communication across Apple's ecosystem. The flaw enables attackers to craft malicious applications that can execute arbitrary code with elevated privileges, effectively bypassing the security boundaries that normally protect system integrity and user data.
The technical nature of this vulnerability stems from improper validation within the libxpc messaging system that handles communication between different processes and services. When a malicious application is installed and executed, it can exploit this flaw to gain access to privileged execution contexts where it should normally be restricted to user-level operations. This represents a classic privilege escalation vulnerability that allows an attacker to move from a standard application context to a system-level privileged environment, potentially enabling full system compromise.
The operational impact of this vulnerability extends beyond simple code execution as it fundamentally undermines the security model that Apple implements across its platforms. Attackers who successfully exploit this vulnerability can potentially access sensitive user data, modify system files, install additional malicious software, and perform actions that would normally be restricted to system administrators or trusted system processes. The widespread nature of affected versions means that a significant portion of Apple's user base was potentially exposed to this risk, particularly given the prevalence of iOS devices and macOS systems in enterprise and consumer environments.
From a cybersecurity perspective, this vulnerability aligns with CWE-264, which covers permissions, privileges, and access control issues, and represents a critical weakness in the operating system's security architecture. The attack vector involves a crafted application that leverages the libxpc component to escalate privileges, making it particularly dangerous as it can be delivered through legitimate app stores or other distribution channels. The ATT&CK framework would classify this as a privilege escalation technique under the T1068 category, specifically targeting the system's inter-process communication mechanisms to gain elevated access rights.
Organizations and users should immediately implement mitigations including updating to the patched versions of affected operating systems, implementing strict application vetting processes, and monitoring for suspicious activity that might indicate exploitation attempts. The patch addresses the core validation issue within libxpc and restores proper privilege boundaries between applications and system processes. Security teams should also consider implementing additional monitoring for unusual process behavior and inter-process communication patterns that might indicate exploitation attempts, as the vulnerability could potentially be used in advanced persistent threat campaigns targeting high-value assets within enterprise environments.