CVE-2019-8733 in iCloud
Summary
by MITRE
Multiple memory corruption issues were addressed with improved memory handling. This issue is fixed in tvOS 13, iTunes for Windows 12.10.1, iCloud for Windows 10.7, iCloud for Windows 7.14. Processing maliciously crafted web content may lead to arbitrary code execution.
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Analysis
by VulDB Data Team • 03/15/2024
The vulnerability identified as CVE-2019-8733 represents a critical memory corruption issue affecting multiple Apple platforms and software components. This vulnerability stems from inadequate memory handling mechanisms within Apple's ecosystem, particularly impacting tvOS 13, iTunes for Windows 12.10.1, and various iCloud for Windows versions. The flaw manifests when these applications process maliciously crafted web content, creating a pathway for attackers to execute arbitrary code on affected systems. The memory corruption issues are classified under CWE-125, which describes out-of-bounds read conditions that can lead to unpredictable behavior and potential code execution. The vulnerability's impact is significant as it affects widely used Apple software components that handle web content processing, making it a prime target for exploitation in targeted attacks. Attackers can leverage this vulnerability by delivering malicious web content through various vectors including compromised websites, email attachments, or malicious advertisements that, when processed by the vulnerable applications, trigger the memory corruption and subsequent code execution.
The technical exploitation of CVE-2019-8733 follows patterns consistent with memory corruption vulnerabilities that align with ATT&CK technique T1203, which involves exploitation of remote services through memory corruption. The vulnerability operates by manipulating memory structures during web content parsing, potentially causing buffer overflows or use-after-free conditions that allow attackers to overwrite critical memory locations. When users interact with malicious web content through vulnerable applications, the corrupted memory state can be leveraged to inject and execute attacker-controlled code with the privileges of the affected application. This creates a severe risk for system compromise as the exploited applications typically run with elevated privileges to handle user data and system integration tasks. The vulnerability's presence in both tvOS and Windows applications demonstrates Apple's cross-platform attack surface, where web content processing components across different operating systems share similar memory handling flaws. The exploitation requires minimal user interaction beyond viewing malicious content, making it particularly dangerous in phishing campaigns or compromised web environments.
The operational impact of CVE-2019-8733 extends beyond individual system compromise to potentially enable broader attack chains within enterprise environments. Organizations using affected Apple software components face significant risk as attackers can leverage this vulnerability to establish persistent access, escalate privileges, or move laterally within networks. The vulnerability's exploitation can lead to data exfiltration, system monitoring, and deployment of additional malware payloads. Security professionals should note that this vulnerability aligns with ATT&CK technique T1059, where adversaries use compromised systems to execute malicious code, and T1071, which involves application layer protocols for command and control communications. The affected software components typically handle sensitive user data including personal files, photos, and system configurations, making successful exploitation particularly damaging. The vulnerability affects both consumer and enterprise users since iCloud for Windows and iTunes for Windows are widely deployed across various organizational environments, potentially creating multiple attack vectors for threat actors. Organizations should consider implementing network monitoring to detect exploitation attempts and ensure immediate patch deployment across all affected systems.
Mitigation strategies for CVE-2019-8733 should prioritize immediate patch deployment as the primary defense mechanism, following Apple's release of security updates for tvOS 13, iTunes for Windows 12.10.1, and iCloud for Windows 10.7 and 7.14 versions. Network administrators should implement web filtering solutions to block access to known malicious domains and content that may trigger exploitation attempts. Security monitoring should include detection of unusual code execution patterns and memory access anomalies that could indicate exploitation attempts. System hardening measures should be implemented including restricting user privileges for applications handling web content, enabling application sandboxing, and deploying exploit prevention technologies. Organizations should conduct vulnerability assessments to identify all instances of affected software across their network infrastructure and prioritize remediation efforts. The mitigation approach should also include user education to prevent interaction with suspicious web content and phishing attempts that could leverage this vulnerability. Additionally, implementing automated patch management systems will help ensure timely deployment of security updates across all affected platforms. Security teams should monitor threat intelligence feeds for indicators of exploitation and maintain incident response procedures specifically tailored to address memory corruption vulnerabilities in Apple applications. The vulnerability's nature as a memory corruption issue also necessitates regular security audits of application memory handling code and implementation of additional runtime protections such as address space layout randomization and data execution prevention mechanisms.