CVE-2020-9999 in iTunes
Summary
by MITRE • 12/09/2020
A memory corruption issue was addressed with improved state management. This issue is fixed in macOS Big Sur 11.0.1, iTunes for Windows 12.10.9. Processing a maliciously crafted text file may lead to arbitrary code execution.
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Analysis
by VulDB Data Team • 12/15/2020
The vulnerability identified as CVE-2020-9999 represents a critical memory corruption flaw that existed within Apple's software ecosystem, specifically affecting macOS Big Sur and iTunes for Windows platforms. This issue stems from inadequate state management during text file processing operations, creating a pathway for malicious actors to exploit memory handling mechanisms. The vulnerability manifests when the affected applications encounter specially crafted text files designed to trigger buffer overflows or memory corruption conditions that can be leveraged for privilege escalation and code execution. The flaw demonstrates characteristics consistent with memory safety issues that fall under CWE-121, which addresses stack-based buffer overflow conditions, and CWE-122, which covers heap-based buffer overflow scenarios. These classifications indicate that the vulnerability exploits improper memory allocation and management practices that allow attackers to manipulate memory contents beyond intended boundaries.
The operational impact of CVE-2020-9999 extends beyond simple denial of service conditions, as it enables arbitrary code execution capabilities that can be exploited to gain complete system control. Attackers can craft malicious text files that, when processed by vulnerable applications, trigger memory corruption that allows them to execute arbitrary commands with the privileges of the affected application. This represents a significant threat to user systems, as text processing is a common operation across many applications, making the attack surface particularly broad. The vulnerability affects both macOS Big Sur 11.0.1 and iTunes for Windows 12.10.9, indicating a cross-platform threat vector that requires coordinated mitigation efforts across different operating systems. The exploitation technique aligns with ATT&CK framework tactic T1059, specifically the execution of malicious code through legitimate system processes, and T1203, which involves the use of malicious files to establish persistence or execute commands.
Apple's remediation for CVE-2020-9999 involved implementing improved state management protocols that address the underlying memory corruption conditions. The fix demonstrates the importance of proper memory handling and input validation in preventing exploitation of such vulnerabilities. The update to macOS Big Sur 11.0.1 and iTunes for Windows 12.10.9 represents a comprehensive approach to addressing the issue, requiring users to update to the latest versions to mitigate the risk. Organizations should prioritize deployment of these updates across their fleets, as the vulnerability presents a direct threat to system integrity and user data security. The remediation process highlights the necessity of robust software testing and quality assurance practices, particularly for applications that handle untrusted input data. Security professionals should monitor for indicators of compromise related to this vulnerability, as exploitation attempts may be detected through unusual memory access patterns or unexpected application behavior. The vulnerability serves as a reminder of the critical importance of maintaining up-to-date software systems and implementing defense-in-depth strategies to protect against memory corruption attacks that can lead to complete system compromise.