CVE-2018-4130 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 • 02/26/2023
The vulnerability identified as CVE-2018-4130 represents a critical memory corruption flaw within Apple's WebKit rendering engine that affected multiple Apple platforms and applications. This vulnerability resides in the core web browsing component that powers Safari, iOS web views, and various other Apple applications that utilize WebKit for web content rendering. The flaw manifests in versions of iOS prior to 11.3, Safari prior to 11.1, iCloud for Windows before version 7.4, iTunes for Windows before version 12.7.4, and tvOS prior to 11.3, demonstrating the widespread impact of WebKit-based vulnerabilities across Apple's ecosystem.
The technical nature of this vulnerability involves memory corruption that occurs when WebKit processes specially crafted web content. Attackers can exploit this weakness by hosting malicious websites that trigger specific memory handling patterns within the WebKit engine, leading to unpredictable behavior including arbitrary code execution or application crashes. The memory corruption aspect places this vulnerability squarely within CWE-121, which describes "Stack-based Buffer Overflow" and related memory corruption issues, while also aligning with CWE-125, "Out-of-Bounds Read" and CWE-787, "Out-of-bounds Write" that represent common memory safety violations in web rendering engines. The vulnerability's exploitation mechanism follows typical patterns described in the ATT&CK framework under T1203, "Exploitation for Client Execution" where attackers leverage software vulnerabilities to execute code on target systems.
The operational impact of CVE-2018-4130 extends beyond simple application instability to potentially enable full system compromise. When remote attackers successfully exploit this vulnerability through malicious websites, they can execute arbitrary code with the privileges of the affected application, which typically runs with user-level permissions in web browsers. This capability allows attackers to install malware, steal sensitive data, modify system files, or establish persistent access points. The vulnerability's presence in both mobile and desktop platforms means that users could be compromised through various attack vectors including phishing emails, malicious advertisements, or compromised websites that users might visit during normal browsing activities. The fact that this vulnerability affected iCloud and iTunes on Windows systems demonstrates Apple's cross-platform attack surface where vulnerabilities in WebKit components could impact users across different operating systems.
Mitigation strategies for CVE-2018-4130 require immediate patching of affected systems to prevent exploitation. Apple released updates for iOS 11.3, Safari 11.1, iCloud 7.4, iTunes 12.7.4, and tvOS 11.3 that addressed the underlying memory corruption issues in WebKit. Organizations should implement comprehensive patch management policies ensuring all affected Apple products receive timely updates. Network security measures including web filtering and sandboxing can provide additional protection layers, though these are not substitutes for proper patching. The vulnerability also highlights the importance of user education regarding safe browsing practices and the dangers of visiting untrusted websites. Security teams should monitor for indicators of compromise related to this vulnerability and implement appropriate detection measures within their network monitoring systems. Given the nature of memory corruption vulnerabilities, the ATT&CK framework suggests implementing process isolation and memory protection mechanisms to limit potential damage from successful exploitation attempts. Regular security assessments of Apple-based systems should include verification of patch compliance and monitoring for any signs of exploitation attempts targeting this specific vulnerability.