CVE-2019-8664 in watchOS
Summary
by MITRE • 10/28/2020
An input validation issue was addressed with improved input validation. This issue is fixed in iOS 12.3, watchOS 5.2.1. Processing a maliciously crafted message may lead to a denial of service.
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Analysis
by VulDB Data Team • 11/28/2020
The vulnerability identified as CVE-2019-8664 represents a critical input validation flaw that affects iOS and watchOS operating systems. This issue stems from insufficient validation mechanisms when processing incoming messages, creating a potential vector for denial of service attacks. The vulnerability was addressed through enhanced input validation measures implemented in iOS 12.3 and watchOS 5.2.1 updates, demonstrating Apple's proactive approach to mitigating security risks in their mobile platforms.
The technical nature of this flaw falls under CWE-20, which specifically addresses "Improper Input Validation" in software systems. This classification indicates that the vulnerability occurs when a system fails to properly validate or sanitize input data before processing it, allowing maliciously crafted data to potentially exploit system resources. The flaw operates at the message processing layer where the operating system handles incoming communications, making it particularly dangerous as it can affect various network protocols and communication channels that rely on message parsing.
From an operational impact perspective, this vulnerability enables attackers to craft malicious messages that, when processed by vulnerable systems, can trigger denial of service conditions. The attack vector typically involves sending specially constructed data packets or messages that exploit the input validation gaps in the system's message handling routines. This can result in system instability, application crashes, or complete system unresponsiveness, effectively rendering the affected device unusable for its intended purpose.
The mitigation strategy for CVE-2019-8664 primarily involves applying the recommended security updates from Apple, specifically iOS 12.3 and watchOS 5.2.1. These updates implement enhanced input validation routines that properly sanitize and validate all incoming message data before processing. Security practitioners should also consider implementing network monitoring solutions to detect anomalous message patterns that might indicate exploitation attempts, aligning with ATT&CK framework technique T1499.002 which covers "Endpoint Denial of Service" attacks. Organizations should prioritize patch management processes to ensure all affected devices receive the necessary updates promptly, as the vulnerability can be exploited remotely without user interaction, making it particularly concerning for enterprise environments.