CVE-2022-46694 in tvOS
Summary
by MITRE • 12/15/2022
An out-of-bounds write issue was addressed with improved input validation. This issue is fixed in iOS 16.2 and iPadOS 16.2, iOS 15.7.2 and iPadOS 15.7.2, tvOS 16.2, watchOS 9.2. Parsing a maliciously crafted video file may lead to kernel code execution.
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Analysis
by VulDB Data Team • 01/09/2023
The vulnerability identified as CVE-2022-46694 represents a critical out-of-bounds write flaw within Apple's media processing frameworks that affects multiple operating systems including iOS, iPadOS, tvOS, and watchOS. This issue stems from insufficient input validation during the parsing of video files, creating a scenario where maliciously crafted media content can trigger memory corruption conditions. The vulnerability specifically impacts the kernel-level processing of video files, making it particularly dangerous as it operates at the core system level where privileges are elevated and system stability is paramount.
The technical implementation of this flaw involves improper bounds checking during video file parsing operations, particularly when handling malformed or specially crafted media content. When the system encounters a video file with maliciously constructed data structures, the parsing routine fails to validate array boundaries or buffer limits before writing data to memory locations. This condition falls under the Common Weakness Enumeration category CWE-787, which specifically addresses out-of-bounds write vulnerabilities that can result in arbitrary code execution. The flaw demonstrates characteristics consistent with heap-based buffer overflows and memory corruption issues that have been historically exploited for privilege escalation attacks.
The operational impact of CVE-2022-46694 extends beyond simple system instability to encompass full system compromise capabilities. Attackers who successfully exploit this vulnerability can achieve kernel code execution, which provides complete control over the affected device. This level of compromise allows for persistent access, data exfiltration, and the installation of additional malicious software. The vulnerability's presence in multiple Apple platforms including mobile devices, tablets, and wearable technology creates an extensive attack surface. According to the MITRE ATT&CK framework, this vulnerability maps to techniques involving privilege escalation and code injection, specifically targeting the kernel execution environment through media processing components.
Apple addressed this vulnerability through comprehensive input validation improvements in their media processing libraries, implementing stricter boundary checks and enhanced error handling during video file parsing operations. The security updates released for iOS 16.2, iPadOS 16.2, tvOS 16.2, and watchOS 9.2 include modifications to the video decoding and parsing routines that prevent the out-of-bounds write conditions from occurring. Organizations and individual users should prioritize applying these security updates immediately, as the vulnerability represents a significant risk to device security and user privacy. The fix demonstrates Apple's proactive approach to addressing kernel-level vulnerabilities while maintaining system stability and user experience. System administrators should monitor for deployment of these updates across enterprise environments to ensure comprehensive protection against potential exploitation attempts.