CVE-2018-4201 in iOS
Summary
by MITRE
An issue was discovered in certain Apple products. iOS before 11.4 is affected. Safari before 11.1.1 is affected. iCloud before 7.5 on Windows is affected. iTunes before 12.7.5 on Windows is affected. tvOS before 11.4 is affected. watchOS before 4.3.1 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 • 03/21/2023
The vulnerability identified as CVE-2018-4201 represents a critical memory corruption flaw within Apple's WebKit rendering engine that affects multiple operating systems and applications. This vulnerability resides in the core web browsing component that powers Safari, iCloud, iTunes, and other Apple applications across iOS, macOS, tvOS, and watchOS platforms. The flaw enables remote attackers to execute arbitrary code or cause denial of service conditions through maliciously crafted web content, making it particularly dangerous in web browsing contexts where users frequently encounter untrusted content.
The technical nature of this vulnerability stems from improper memory handling within WebKit's JavaScript engine and rendering components, specifically manifesting as heap-based buffer overflows and memory corruption issues. When a user visits a malicious website, the attacker can leverage this vulnerability to overwrite memory locations and potentially execute arbitrary code with the privileges of the affected application. This type of vulnerability falls under CWE-121, heap-based buffer overflow, and CWE-125, out-of-bounds read, both of which are common vectors for privilege escalation and remote code execution attacks. The vulnerability's exploitation requires no user interaction beyond visiting a malicious webpage, making it particularly dangerous in phishing campaigns and drive-by download scenarios.
The operational impact of CVE-2018-4201 extends across Apple's entire ecosystem, affecting versions of iOS prior to 11.4, Safari before 11.1.1, iCloud before 7.5 on Windows, iTunes before 12.7.5 on Windows, tvOS before 11.4, and watchOS before 4.3.1. This widespread impact means that attackers could compromise devices running any of these affected versions through web-based attacks, potentially leading to complete system compromise. The vulnerability's presence in both mobile and desktop applications creates multiple attack vectors, with the Windows versions of iCloud and iTunes being particularly concerning given the typical security posture of enterprise environments where these applications are commonly used. The memory corruption nature of the flaw also means that applications could crash unpredictably, leading to denial of service conditions that could be exploited for persistent disruption attacks.
Mitigation strategies for CVE-2018-4201 primarily focus on immediate patch deployment and system updates across all affected Apple platforms. Organizations should prioritize updating to the latest versions of iOS 11.4, Safari 11.1.1, iCloud 7.5, iTunes 12.7.5, tvOS 11.4, and watchOS 4.3.1 to eliminate the vulnerability. Network security teams should implement web filtering solutions and browser security controls to prevent access to known malicious domains until patches can be deployed. The vulnerability's classification under the MITRE ATT&CK framework as a remote code execution technique (T1059.007) indicates that defensive measures should include monitoring for unusual process execution patterns and memory access anomalies. Additionally, users should be educated about the dangers of visiting untrusted websites and the importance of keeping their systems updated, as this vulnerability represents a classic example of how web-based attacks can bypass traditional security controls through sophisticated exploitation of browser rendering engines.