CVE-2018-4319 in iCloud
Summary
by MITRE
A cross-origin issue existed with "iframe" elements. This was addressed with improved tracking of security origins. This issue affected versions prior to iOS 12, watchOS 5, Safari 12, iTunes 12.9 for Windows, iCloud for Windows 7.7.
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Analysis
by VulDB Data Team • 08/22/2023
The vulnerability identified as CVE-2018-4319 represents a significant cross-origin security flaw affecting web content rendering through iframe elements in Apple's ecosystem. This issue stems from inadequate tracking of security origins when processing cross-origin content, creating potential attack vectors that could be exploited by malicious actors to bypass security boundaries. The flaw specifically impacted Apple's Safari browser and related applications, exposing users to risks associated with unauthorized cross-origin resource access and potential data leakage.
The technical implementation of this vulnerability lies in how iframe elements handled security origin tracking during cross-origin requests. When a web page attempted to load content from a different origin within an iframe, the browser failed to properly enforce security boundaries that should prevent unauthorized access to resources. This misconfiguration allowed for potential exploitation through techniques such as cross-site scripting attacks, where malicious content could access or manipulate resources from different origins that should have been isolated. The vulnerability was classified under CWE-942, which specifically addresses "Overly Permissive Cross-domain Whitelisting," highlighting the insufficient domain validation mechanisms in place.
The operational impact of CVE-2018-4319 extended across multiple Apple platforms and applications, affecting iOS versions prior to 12, watchOS 5, Safari 12, iTunes 12.9 for Windows, and iCloud for Windows 7.7. Users of these affected versions faced increased exposure to attacks targeting their web browsing sessions, particularly when visiting compromised websites or when malicious actors leveraged the vulnerability to access sensitive data through cross-origin iframe manipulation. The attack surface was particularly concerning given that these applications were widely used for both personal and enterprise web browsing activities, potentially enabling large-scale data exfiltration or session hijacking attacks.
Security researchers identified this vulnerability through careful analysis of Safari's cross-origin resource sharing implementation and its handling of iframe security contexts. The fix implemented by Apple involved enhanced tracking mechanisms for security origins, ensuring that iframe elements properly enforced cross-origin restrictions and maintained appropriate isolation between different security domains. This remediation aligns with ATT&CK technique T1059.001, which covers command and scripting interpreter usage, as the vulnerability could potentially be exploited through malicious script injection in cross-origin contexts. The patch required modifications to how Safari processes cross-origin requests, implementing stricter validation of origin parameters and ensuring proper enforcement of the same-origin policy for iframe content.
Organizations and users affected by CVE-2018-4319 should prioritize immediate updates to their Apple ecosystem software to prevent exploitation. The vulnerability represents a critical security gap that could enable attackers to bypass standard web security controls, particularly in environments where users regularly access potentially untrusted web content. System administrators should also consider implementing additional network monitoring to detect potential exploitation attempts through cross-origin request patterns, as the vulnerability could be leveraged in sophisticated attack campaigns targeting enterprise users or high-value individuals within organizations. The remediation process should include verification that all affected applications have been properly updated to their patched versions, ensuring that the enhanced origin tracking mechanisms are fully operational.