CVE-2016-4734 in tvOS
Summary
by MITRE
WebKit in Apple iOS before 10, Safari before 10, and tvOS before 10 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted web site, a different vulnerability than CVE-2016-4611, CVE-2016-4730, CVE-2016-4733, and CVE-2016-4735.
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Analysis
by VulDB Data Team • 09/21/2022
This vulnerability exists within the WebKit rendering engine component of Apple's mobile and desktop operating systems, specifically affecting iOS versions prior to 10.0, Safari versions prior to 10.0, and tvOS versions prior to 10.0. The flaw represents a memory corruption issue that can be exploited through maliciously crafted web content, enabling remote code execution or denial of service conditions. The vulnerability operates by leveraging improper memory handling during web page rendering processes, creating opportunities for attackers to inject and execute arbitrary code on affected systems. Security researchers have identified this as a distinct vulnerability from several related issues including CVE-2016-4611, CVE-2016-4730, CVE-2016-4733, and CVE-2016-4735, each representing different aspects of WebKit's memory management weaknesses.
The technical implementation of this vulnerability involves memory corruption that occurs when WebKit processes certain web content structures. Attackers can craft web pages containing specifically designed malicious code that triggers buffer overflows or use-after-free conditions within the rendering engine's memory management systems. These memory corruption flaws typically arise from insufficient bounds checking or improper memory deallocation during web page processing, allowing attackers to manipulate memory contents in ways that can lead to code execution. The vulnerability is particularly dangerous because it can be triggered through normal web browsing activities, making it difficult for users to protect themselves without system updates. This type of flaw maps directly to CWE-125 (Out-of-bounds Read) and CWE-787 (Out-of-bounds Write) categories, which are fundamental memory safety issues that have been extensively documented in cybersecurity literature.
The operational impact of CVE-2016-4734 extends beyond simple exploitation as it represents a significant threat to user privacy and system integrity across Apple's ecosystem. Successful exploitation could allow attackers to gain full control of affected devices, potentially leading to data theft, persistent backdoor installation, or complete system compromise. The vulnerability affects not only individual users but also enterprise environments where Apple devices are commonly deployed, creating potential risks for corporate networks and sensitive data repositories. Organizations using Apple products for business operations face increased exposure to advanced persistent threats that could leverage this vulnerability to establish long-term access to their systems. The remote nature of the attack vector means that users need not take any action beyond visiting compromised websites, making this vulnerability particularly concerning from a threat modeling perspective. From an attack framework standpoint, this vulnerability aligns with techniques described in the MITRE ATT&CK framework under the T1059 (Command and Scripting Interpreter) and T1068 (Exploitation for Privilege Escalation) tactics, as attackers can use the initial compromise to escalate privileges and execute further malicious activities.
Mitigation strategies for this vulnerability primarily focus on immediate system updates and patch management protocols. Apple released security updates for iOS 10, Safari 10, and tvOS 10 that address the underlying memory corruption issues in WebKit. Organizations should implement comprehensive patch management procedures to ensure all affected Apple devices receive the necessary security updates promptly. Additional protective measures include implementing web content filtering solutions, deploying network monitoring tools to detect suspicious traffic patterns, and educating users about the risks of visiting untrusted websites. Security professionals should also consider implementing browser sandboxing techniques and network segmentation to limit potential attack surfaces. Regular vulnerability assessments and penetration testing can help identify systems that may not have received the required updates, while monitoring for indicators of compromise can provide early detection of potential exploitation attempts. The vulnerability demonstrates the critical importance of maintaining up-to-date security patches and highlights the need for continuous monitoring of emerging threats within the browser ecosystem.