CVE-2019-8673 in iTunes
Summary
by MITRE
Multiple memory corruption issues were addressed with improved memory handling. This issue is fixed in iOS 12.4, macOS Mojave 10.14.6, tvOS 12.4, Safari 12.1.2, iTunes for Windows 12.9.6, iCloud for Windows 7.13, iCloud for Windows 10.6. Processing maliciously crafted web content may lead to arbitrary code execution.
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Analysis
by VulDB Data Team • 11/07/2023
The vulnerability identified as CVE-2019-8673 represents a critical memory corruption issue that affected multiple Apple operating systems and applications. This flaw emerged from inadequate memory handling practices within Apple's software ecosystem, specifically impacting iOS 12.4, macOS Mojave 10.14.6, tvOS 12.4, Safari 12.1.2, iTunes for Windows 12.9.6, and various iCloud for Windows versions. The vulnerability stems from insufficient validation mechanisms when processing web content, creating opportunities for attackers to exploit memory handling weaknesses that could result in arbitrary code execution. The issue is classified under CWE-122, which describes "Heap-based Buffer Overflow" conditions, indicating that memory corruption occurs through improper heap management during web content processing. Attackers could leverage this vulnerability by crafting malicious web content that, when rendered by affected applications, triggers memory corruption patterns leading to complete system compromise.
The technical nature of this vulnerability lies in how Apple's web rendering engines handle memory allocation and deallocation when processing crafted web content. When users encounter maliciously formatted web pages or embedded content, the memory management routines fail to properly validate input boundaries, leading to buffer overflows or memory corruption that can be exploited to execute arbitrary code. The exploitation requires no user interaction beyond visiting a malicious website or opening compromised web content, making it particularly dangerous in phishing attacks or drive-by download scenarios. The vulnerability represents a classic example of improper input validation in web rendering components, where attackers can manipulate memory layout through carefully crafted payloads. This type of flaw aligns with ATT&CK technique T1203, which covers "Exploitation for Client Execution" through web-based attack vectors.
The operational impact of CVE-2019-8673 extends across multiple attack surfaces within Apple's ecosystem, affecting desktop, mobile, and web applications simultaneously. Organizations and individual users running affected versions face significant risk of unauthorized system compromise, data exfiltration, and persistent backdoor installation. The vulnerability's exploitation capability means that attackers could gain full system control without requiring additional privileges, potentially enabling them to install malware, modify system files, or establish persistent access. The widespread nature of the affected software versions creates a broad attack surface, as the vulnerability exists across different platforms including macOS, iOS, and Windows applications that utilize Apple's web rendering technologies. Security professionals must consider this vulnerability as part of broader threat modeling exercises, particularly for environments where users might encounter untrusted web content or where legacy software versions persist.
Mitigation strategies for CVE-2019-8673 primarily focus on immediate software updates and system hardening measures. Organizations should prioritize updating all affected systems to the patched versions including iOS 12.4, macOS Mojave 10.14.6, tvOS 12.4, Safari 12.1.2, iTunes for Windows 12.9.6, and iCloud for Windows 7.13 or 10.6 respectively. Additionally, network administrators should implement web filtering solutions and content sanitization measures to reduce exposure to malicious web content. Browser security configurations should be hardened through disabling unnecessary web features and implementing strict content security policies. The vulnerability's exploitation requires no user interaction beyond visiting malicious content, making proactive patching essential. Security monitoring should include detection of suspicious web traffic patterns and anomalous system behavior that might indicate exploitation attempts, particularly focusing on memory corruption indicators and unexpected code execution patterns that align with the ATT&CK framework's T1059 and T1070 techniques.