CVE-2018-4376 in Safari
Summary
by MITRE
Multiple memory corruption issues were addressed with improved memory handling. This issue affected versions prior to iOS 12.1, watchOS 5.1, Safari 12.0.1, iTunes 12.9.1, iCloud for Windows 7.8.
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Analysis
by VulDB Data Team • 04/08/2020
The vulnerability identified as CVE-2018-4376 represents a series of memory corruption issues that were prevalent in multiple Apple operating systems and applications prior to specific version updates. These memory handling flaws exposed systems to potential exploitation through improper memory management practices that could lead to system instability or unauthorized access. The vulnerability affected a broad ecosystem including iOS devices, watchOS platforms, Safari web browser, iTunes software, and iCloud for Windows applications, indicating a systemic issue in Apple's memory allocation and deallocation mechanisms across their product portfolio.
The technical nature of this vulnerability falls under memory corruption categories that can be categorized as CWE-125, which describes out-of-bounds read conditions, and CWE-787, which covers out-of-bounds write operations. These memory corruption flaws typically occur when applications fail to properly validate memory boundaries during allocation and deallocation processes, allowing attackers to manipulate memory contents or trigger system crashes. The issue specifically manifested in improper memory handling where buffer overflows or underflows could occur during normal application operations, potentially enabling attackers to execute arbitrary code or cause denial of service conditions.
The operational impact of CVE-2018-4376 was significant across Apple's ecosystem, as it affected versions of iOS, watchOS, Safari, iTunes, and iCloud for Windows that were widely deployed in enterprise and consumer environments. Attackers could potentially exploit these memory corruption vulnerabilities to gain elevated privileges, execute malicious code, or cause system instability that would affect user data and device functionality. The vulnerability's presence in Safari and iTunes made it particularly dangerous as these applications frequently interact with external content and network resources, creating multiple attack vectors for exploitation. Organizations relying on these platforms faced potential security breaches and system compromise risks that could impact sensitive data and operational continuity.
Mitigation strategies for CVE-2018-4376 required immediate deployment of security updates from Apple, specifically iOS 12.1, watchOS 5.1, Safari 12.0.1, iTunes 12.9.1, and iCloud for Windows 7.8. These updates implemented improved memory handling mechanisms including enhanced bounds checking, memory allocation validation, and proper deallocation procedures. Organizations should have prioritized patch management processes to ensure all affected systems received updates promptly, as the vulnerability could be exploited through various attack vectors including web browsing, file processing, and network-based interactions. The remediation efforts aligned with ATT&CK technique T1059.007 for command and script interpreter, as attackers could potentially leverage these memory corruption flaws to execute malicious payloads through compromised applications. Additionally, implementing network monitoring and endpoint detection systems would have helped identify exploitation attempts and provided early warning capabilities against potential attacks targeting these memory corruption vulnerabilities.