CVE-2018-4101 in iCloud
Summary
by MITRE
An issue was discovered in certain Apple products. iOS before 11.3 is affected. Safari before 11.1 is affected. iCloud before 7.4 on Windows is affected. iTunes before 12.7.4 on Windows is affected. tvOS before 11.3 is affected. The issue involves the "WebKit" component. It allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption and application crash) via a crafted web site.
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Analysis
by VulDB Data Team • 02/08/2021
The vulnerability identified as CVE-2018-4101 represents a critical memory corruption flaw within Apple's WebKit rendering engine that affects multiple operating systems and applications. This issue resides in the core web browsing component responsible for processing and displaying web content across Apple's ecosystem, making it particularly dangerous as it can be exploited through standard web browsing activities. The vulnerability impacts iOS versions prior to 11.3, Safari versions before 11.1, iCloud for Windows versions prior to 7.4, iTunes for Windows versions before 12.7.4, and tvOS versions prior to 11.3, demonstrating the widespread reach of this flaw across Apple's product portfolio. The WebKit component serves as the foundation for web content rendering in Apple's browsers and applications, making this vulnerability particularly concerning for security researchers and threat actors alike.
The technical nature of this vulnerability involves memory corruption that can be triggered when processing maliciously crafted web content. Attackers can construct specific web pages that, when loaded in affected browsers or applications, cause the WebKit engine to improperly handle memory allocation and deallocation processes. This memory corruption can manifest as arbitrary code execution capabilities or cause application crashes and denial of service conditions. The flaw likely stems from insufficient input validation or improper memory management within the WebKit rendering engine, potentially involving buffer overflows, use-after-free conditions, or other memory safety issues that are commonly categorized under CWE-122 (Heap Overflow) or CWE-416 (Use After Free) categories. These types of vulnerabilities are particularly dangerous because they can be exploited remotely through web-based attacks without requiring user interaction beyond visiting a malicious website.
The operational impact of CVE-2018-4101 extends beyond simple application crashes, as it provides attackers with potential pathways for remote code execution on affected systems. This capability enables adversaries to gain unauthorized access to devices, potentially leading to complete system compromise, data exfiltration, or the installation of persistent backdoors. The vulnerability's reach across multiple Apple platforms including mobile devices, desktop operating systems, and specialized applications creates numerous attack vectors for threat actors. Organizations and individual users running affected versions of Apple software face significant security risks, particularly in environments where web browsing is common or where users may encounter malicious content through phishing campaigns, compromised websites, or social engineering attacks. The vulnerability's exploitation potential aligns with ATT&CK tactics such as initial access through web-based phishing and privilege escalation through remote code execution, making it a particularly attractive target for cybercriminals and nation-state actors.
Mitigation strategies for CVE-2018-4101 primarily focus on immediate software updates and patches provided by Apple. Users should promptly upgrade to the latest versions of affected software, including iOS 11.3, Safari 11.1, iCloud 7.4, iTunes 12.7.4, and tvOS 11.3, which contain the necessary security fixes. Organizations should implement comprehensive patch management processes to ensure all affected Apple devices are updated promptly. Additional protective measures include implementing web filtering solutions, disabling automatic web browsing in sensitive environments, and monitoring for suspicious network activity that may indicate exploitation attempts. Security teams should also consider implementing network segmentation to limit the potential impact of successful exploitation and maintain detailed logging of web browsing activities for forensic analysis. The vulnerability highlights the importance of regular software updates and the need for organizations to maintain robust security hygiene practices across all platforms within their environments, particularly given the widespread nature of the affected Apple products and the remote exploitability of the flaw.