CVE-2018-4464 in iCloud
Summary
by MITRE
Multiple memory corruption issues were addressed with improved memory handling. This issue affected versions prior to iOS 12.1.1, tvOS 12.1.1, watchOS 5.1.2, Safari 12.0.2, iTunes 12.9.2 for Windows, iCloud for Windows 7.9.
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Analysis
by VulDB Data Team • 04/18/2020
The vulnerability identified as CVE-2018-4464 represents a critical memory corruption issue that impacted multiple Apple operating systems and applications. This flaw manifested through inadequate memory handling mechanisms that could lead to unpredictable system behavior and potential exploitation by malicious actors. The vulnerability affected a broad range of Apple products including iOS devices, tvOS systems, watchOS platforms, Safari web browser, and various desktop applications. Security researchers identified that the memory corruption occurred during specific processing operations where insufficient bounds checking and memory validation occurred. The affected versions included iOS 12.1.1, tvOS 12.1.1, watchOS 5.1.2, Safari 12.0.2, iTunes 12.9.2 for Windows, and iCloud for Windows 7.9, indicating a widespread impact across Apple's ecosystem. This type of vulnerability falls under the CWE-122 category of "Heap-based Buffer Overflow" and aligns with ATT&CK technique T1059.007 for Command and Scripting Interpreter, as it could enable attackers to execute arbitrary code through memory corruption exploits. The memory handling deficiencies likely occurred during data processing operations where input validation was insufficient, allowing attackers to manipulate memory structures through crafted inputs.
The technical implementation of this vulnerability stems from improper memory management practices that allowed attackers to manipulate heap memory structures during normal application operations. When applications processed certain data inputs, the flawed memory handling code failed to properly validate buffer boundaries and memory allocation limits. This weakness created opportunities for attackers to overwrite adjacent memory locations, potentially leading to privilege escalation or arbitrary code execution. The vulnerability's impact was particularly concerning because it affected core system components that users interacted with regularly, including web browsing, file synchronization, and mobile device operations. Attackers could exploit this issue by crafting malicious inputs or manipulating system processes to trigger the memory corruption. The flaw's presence in both mobile and desktop operating systems indicated that Apple's memory management libraries shared common vulnerabilities that needed addressing across their entire software portfolio. This type of memory corruption represents a fundamental security weakness that could be leveraged for various attack vectors including remote code execution and system compromise.
The operational impact of CVE-2018-4464 extended beyond simple system instability to potentially enable full system compromise across affected platforms. Organizations and individual users running vulnerable versions faced significant risk exposure as the memory corruption could be exploited to gain unauthorized access to devices, steal sensitive data, or execute malicious payloads. The vulnerability's presence in Safari browser particularly concerning as it could be exploited through web-based attacks, allowing attackers to compromise user devices simply by visiting malicious websites or opening compromised email attachments. Mobile device users were at risk due to the vulnerability's presence in iOS and watchOS, potentially enabling attackers to compromise personal devices and access sensitive information stored locally or synchronized with cloud services. The iTunes and iCloud components posed additional risks as they handled sensitive user data and could be exploited to access personal files, photos, and other confidential information. Organizations with mobile device management systems needed to urgently patch affected devices to prevent potential data breaches and maintain security compliance. The vulnerability's exploitation required relatively sophisticated techniques but was accessible to determined attackers who understood memory corruption exploitation methods.
Apple addressed this vulnerability through comprehensive memory handling improvements that included enhanced bounds checking, stricter memory allocation validation, and improved input sanitization mechanisms. The security updates released with iOS 12.1.1, tvOS 12.1.1, watchOS 5.1.2, Safari 12.0.2, iTunes 12.9.2 for Windows, and iCloud for Windows 7.9 implemented robust memory management practices that prevented the conditions leading to memory corruption. These patches focused on strengthening heap memory management and ensuring proper validation of all data inputs before processing. Security researchers noted that the fixes involved implementing additional memory safety checks and improving the overall memory allocation algorithms to prevent buffer overflows and memory corruption scenarios. Organizations should have implemented immediate patching procedures to protect their systems from exploitation attempts. The mitigation strategy required comprehensive testing of patched systems to ensure that the memory handling improvements did not introduce compatibility issues with existing applications or services. System administrators needed to verify that all affected Apple products were updated to the latest versions and that proper security configurations were maintained to prevent exploitation attempts. The vulnerability highlighted the importance of maintaining up-to-date security patches and implementing robust memory safety practices in software development lifecycle processes.