CVE-2019-8712 in tvOS
Summary
by MITRE • 10/28/2020
A memory corruption issue was addressed with improved memory handling. This issue is fixed in watchOS 6, iOS 13, tvOS 13. An application may be able to execute arbitrary code with system privileges.
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Analysis
by VulDB Data Team • 11/28/2020
This vulnerability represents a critical memory corruption flaw that existed in Apple's mobile operating systems prior to the release of iOS 13, watchOS 6, and tvOS 13. The issue stems from inadequate memory handling mechanisms within the kernel or system frameworks that govern how applications interact with system resources. Such memory corruption vulnerabilities are particularly dangerous because they can be exploited to gain elevated privileges and execute arbitrary code with system-level access. The flaw likely manifested through improper memory allocation, deallocation, or access control mechanisms that allowed malicious applications to manipulate memory structures beyond their intended boundaries.
The technical nature of this vulnerability aligns with common CWE categories related to memory safety issues, specifically CWE-125 for out-of-bounds read conditions and CWE-787 for out-of-bounds write conditions. These types of flaws typically arise when developers fail to properly validate memory boundaries or when buffer overflow conditions are not adequately prevented. The exploitation vector likely involved an application that could trigger memory corruption through crafted inputs or specific API calls that would cause the system to allocate or access memory in unintended ways, potentially leading to code execution in kernel space.
From an operational impact perspective, this vulnerability created a severe security risk for all affected Apple devices running the vulnerable versions of iOS, watchOS, and tvOS. An attacker could potentially craft a malicious application that, when installed or executed, would exploit this memory corruption to gain root privileges on the device. This would enable full system compromise, allowing unauthorized access to all user data, communication channels, and device functions. The implications extend beyond individual privacy concerns to potential enterprise security breaches, as compromised devices could serve as entry points for broader network infiltration. The vulnerability also represents a significant concern for law enforcement and government agencies that rely on secure mobile devices for sensitive communications.
The remediation for this vulnerability required Apple to implement improved memory handling mechanisms throughout their operating systems. This likely involved enhanced input validation, stricter memory allocation controls, and improved bounds checking in system frameworks. The fix would have been incorporated into the respective operating system updates, requiring users to install iOS 13, watchOS 6, and tvOS 13 to eliminate the risk. Security researchers and organizations should consider this vulnerability as part of their ongoing monitoring efforts, particularly when assessing the security posture of mobile environments. The fix demonstrates Apple's approach to addressing memory safety issues through comprehensive system-level improvements rather than patching individual applications, aligning with best practices for kernel-level security hardening. This vulnerability serves as a reminder of the critical importance of proper memory management in system software and the potential consequences when such safeguards are insufficient.