CVE-2019-8745 in iCloud
Summary
by MITRE
A buffer overflow was addressed with improved bounds checking. This issue is fixed in macOS Catalina 10.15, tvOS 13, iTunes for Windows 12.10.1, iCloud for Windows 10.7, iCloud for Windows 7.14. Processing a maliciously crafted text file may lead to arbitrary code execution.
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Analysis
by VulDB Data Team • 03/15/2024
The vulnerability identified as CVE-2019-8745 represents a critical buffer overflow flaw that was discovered in Apple's software ecosystem affecting multiple platforms including macOS, tvOS, and Windows applications. This issue stems from inadequate bounds checking mechanisms within the text processing libraries used by Apple's applications, particularly impacting iTunes and iCloud for Windows installations. The vulnerability manifests when these applications process maliciously crafted text files, creating an opportunity for attackers to execute arbitrary code on affected systems. The flaw exists in the way these applications handle input validation for text data, specifically when parsing structured text formats that may contain oversized or malformed data sequences. The buffer overflow occurs because the applications fail to properly verify the size of incoming text data against the allocated buffer space, allowing attackers to overwrite adjacent memory locations with malicious payloads.
The technical exploitation of this vulnerability aligns with common attack patterns described in the attack tree framework and can be mapped to CWE-121, which addresses stack-based buffer overflow conditions. The flaw essentially allows attackers to manipulate memory layout by overflowing buffers, potentially leading to privilege escalation or complete system compromise. When a user opens or processes a specially crafted text file, the application's text parser fails to validate input boundaries, causing the program to write beyond allocated memory segments. This memory corruption can be leveraged to redirect program execution flow, inject malicious code, or manipulate system behavior through controlled overwrite of return addresses and function pointers. The vulnerability affects multiple Apple applications including iTunes and iCloud for Windows, which are widely used across enterprise and consumer environments, making the potential impact significant.
The operational impact of CVE-2019-8745 extends beyond simple code execution capabilities as it represents a persistent threat vector that can be exploited through social engineering campaigns targeting end users. Attackers can distribute malicious text files through various channels including email attachments, compromised websites, or malicious downloads, making this vulnerability particularly dangerous in enterprise environments where users may inadvertently open compromised files. The attack surface is broad given that the vulnerability affects multiple platforms including Windows systems running Apple applications, indicating that organizations must consider cross-platform security implications when implementing mitigation strategies. Security professionals should note that this vulnerability can be exploited in the context of zero-day attacks, where attackers leverage the flaw before organizations have time to deploy patches or implement defensive measures.
Mitigation strategies for CVE-2019-8745 should focus on immediate patch deployment across all affected Apple applications and operating systems, with particular attention to macOS Catalina 10.15, tvOS 13, and the specific Windows application versions mentioned in the advisory. Organizations should implement network-based controls such as content filtering and email security solutions to prevent users from accessing malicious text files that could exploit this vulnerability. The implementation of application whitelisting and sandboxing mechanisms can provide additional protection layers by restricting the execution of untrusted text processing operations. Security monitoring should include detection of anomalous text file processing activities and unusual memory allocation patterns that might indicate exploitation attempts. System administrators should also consider implementing least privilege principles for user accounts and regularly review access controls for Apple applications to minimize potential damage from successful exploitation attempts. The vulnerability's classification as a buffer overflow makes it particularly susceptible to exploitation through techniques such as return-oriented programming and stack pivoting, emphasizing the need for comprehensive memory protection mechanisms including stack canaries, address space layout randomization, and data execution prevention features.