CVE-2025-43252 in macOS
Summary
by MITRE • 07/30/2025
This issue was addressed by adding an additional prompt for user consent. This issue is fixed in macOS Sequoia 15.6. A website may be able to access sensitive user data when resolving symlinks.
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Analysis
by VulDB Data Team • 07/31/2025
This vulnerability represents a significant privacy and security concern within macOS environments, specifically related to symlink resolution behavior that could potentially expose sensitive user data. The issue stems from how the operating system handles symbolic link resolution processes, where malicious websites could exploit this mechanism to access data they should not be permitted to reach. The vulnerability exists in the underlying file system access controls and permission models that govern how symbolic links are processed when accessed through web applications. This represents a bypass of normal security boundaries that should prevent web content from accessing arbitrary file system locations, particularly those containing sensitive user information. The flaw essentially allows for unauthorized data access through a path traversal mechanism that leverages the symlink resolution functionality in a way that circumvents standard security checks.
The technical implementation of this vulnerability involves the improper handling of symbolic link resolution within web content rendering contexts. When a website attempts to resolve symlinks, the system fails to properly validate or restrict the access paths that can be traversed through these symbolic references. This creates an attack surface where malicious code could follow symlinks to access files in protected directories such as user home folders, system configuration files, or other sensitive locations. The vulnerability is particularly concerning because it operates at a low level within the file system access layer, making it difficult to detect through traditional web application security measures. The issue is classified under CWE-22 as a Path Traversal vulnerability, specifically involving improper handling of symbolic links during file resolution processes. This type of vulnerability allows for arbitrary file access that could lead to complete system compromise or data exfiltration.
The operational impact of this vulnerability extends beyond simple data access, potentially enabling attackers to gather sensitive information about users, system configurations, or even credentials stored in files that should be protected. Attackers could leverage this weakness to access personal documents, system logs, browser data, or other confidential information that would normally be restricted from web-based access. The vulnerability affects the core security model of macOS by allowing websites to bypass normal file system access controls, which could lead to a complete compromise of user privacy and system integrity. This represents a critical weakness in the operating system's sandboxing mechanisms and access control enforcement, particularly when dealing with file system operations initiated through web content. The attack vector typically involves hosting malicious web content that attempts to resolve symlinks to access protected directories, potentially enabling information disclosure, privilege escalation, or further exploitation of the system.
The fix implemented by Apple in macOS Sequoia 15.6 addresses this vulnerability through enhanced user consent mechanisms that require explicit permission before allowing web content to access potentially sensitive file system locations. This mitigation strategy aligns with the principle of least privilege by ensuring that users are explicitly informed about and approve any access to sensitive data through web-based applications. The additional prompt for user consent serves as a critical defense layer that prevents automated exploitation of the symlink resolution flaw. This approach follows security best practices outlined in the NIST Cybersecurity Framework and aligns with the MITRE ATT&CK framework's techniques for privilege escalation and credential access. The solution essentially requires explicit user acknowledgment for any file system operations that could potentially expose sensitive data, thereby breaking the automated exploitation chain. Organizations should ensure all systems are updated to macOS Sequoia 15.6 or later versions to mitigate this vulnerability, as the additional consent prompt provides a crucial barrier against unauthorized access to sensitive user data through symlink resolution attacks.