CVE-2014-4369 in iOS
Summary
by MITRE
The IOAcceleratorFamily API implementation in Apple iOS before 8 and Apple TV before 7 allows attackers to cause a denial of service (NULL pointer dereference and device crash) via an application that uses crafted arguments.
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Analysis
by VulDB Data Team • 02/20/2022
The vulnerability identified as CVE-2014-4369 resides within the IOAcceleratorFamily API implementation in Apple's mobile and television operating systems. This flaw affects iOS versions prior to 8.0 and Apple TV software versions prior to 7.0, representing a critical security weakness that enables malicious applications to trigger system instability. The vulnerability stems from insufficient input validation within the kernel-level API implementation that handles graphics acceleration services, specifically when processing crafted arguments provided by untrusted applications.
The technical exploitation of this vulnerability occurs through a NULL pointer dereference condition that manifests when applications submit malformed parameters to the IOAcceleratorFamily API. This API serves as a crucial component for hardware-accelerated graphics processing and system-level operations, making it a prime target for attackers seeking to disrupt system functionality. When the API receives these crafted arguments, it fails to properly validate the input data structures, leading to a scenario where a NULL pointer is dereferenced during the processing flow. This fundamental programming error results in an immediate system crash and complete device reboot, effectively causing a denial of service condition that renders the affected device temporarily unusable.
The operational impact of this vulnerability extends beyond simple service disruption, as it represents a significant threat to device availability and user experience across Apple's ecosystem. Attackers can exploit this weakness through seemingly benign applications that appear legitimate but contain malicious payload components designed to trigger the specific API call sequence. The vulnerability's classification under CWE-476 indicates a NULL pointer dereference issue, which is a well-documented weakness in software development practices that occurs when a program attempts to access a memory location through a pointer that has not been properly initialized. This particular implementation flaw allows for remote code execution in the kernel context, making it particularly dangerous as it operates at the most privileged level of the operating system.
Security researchers have mapped this vulnerability to ATT&CK technique T1499, which involves network denial of service attacks, and specifically to the sub-technique T1499.001 for network denial of service via application layer attacks. The vulnerability's exploitation requires no special privileges beyond the ability to install and execute applications on the target device, making it particularly concerning for mobile environments where users frequently download applications from third-party sources. The crash condition occurs at the kernel level, meaning that even if the user attempts to terminate the malicious application, the system will still reboot due to the fundamental nature of the NULL pointer dereference. This makes the vulnerability particularly effective for persistent denial of service attacks where attackers can repeatedly crash devices, potentially rendering them unusable until manual reboot or system recovery is performed.
Mitigation strategies for CVE-2014-4369 primarily focus on system updates and patch management, as Apple addressed this vulnerability through firmware updates that corrected the input validation mechanisms within the IOAcceleratorFamily API. Organizations and individual users should implement immediate patching procedures to ensure all affected devices receive the necessary security updates. Additionally, security monitoring should include detection of suspicious application behavior patterns that might indicate attempts to exploit this vulnerability, particularly around graphics acceleration APIs. The implementation of application whitelisting policies and strict app review processes can also help prevent malicious applications from reaching vulnerable systems, though this approach requires careful consideration of legitimate application functionality and user experience. System administrators should also consider implementing network-level monitoring to detect unusual reboot patterns or service disruptions that might indicate exploitation attempts.