CVE-2024-44131 in iOS
Summary
by MITRE • 09/17/2024
This issue was addressed with improved validation of symlinks. This issue is fixed in iOS 18 and iPadOS 18, macOS Sequoia 15. An app may be able to access sensitive user data.
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Analysis
by VulDB Data Team • 09/24/2024
This vulnerability represents a critical security flaw in Apple's operating systems that stems from inadequate symlink validation mechanisms within the file system access controls. The issue affects iOS 17 and iPadOS 17, as well as macOS Sonoma 14 and earlier versions, where applications can potentially exploit weak symlink validation to gain unauthorized access to sensitive user data. The vulnerability arises from insufficient input sanitization and validation of symbolic link references, allowing malicious applications to traverse file system boundaries and access protected resources they should not be permitted to reach. This type of flaw falls under the broader category of path traversal vulnerabilities that have been historically categorized as CWE-22 Path Traversal and CWE-36 Absolute Path Traversal. The security implications extend beyond simple file access violations as they can potentially enable attackers to escalate privileges and access personal information stored in protected directories.
The technical exploitation of this vulnerability occurs when an application creates or manipulates symbolic links without proper validation of the target paths, allowing for unintended access patterns. Attackers can craft malicious symlink structures that bypass normal file system access controls, potentially leading to information disclosure of sensitive user data including personal files, communications, and system configuration information. This weakness particularly affects applications that handle file operations or user data processing, where the improper handling of symbolic links can create attack vectors for data exfiltration. The vulnerability demonstrates a failure in the principle of least privilege enforcement within the operating system's file access controls, where proper validation should have been implemented to prevent unauthorized access through symlink manipulation. According to ATT&CK framework, this vulnerability maps to T1074 Data Staged and T1005 Data from Local System categories, as it enables unauthorized data collection through compromised application access paths.
The operational impact of this vulnerability extends across multiple attack surfaces within Apple's ecosystem, potentially allowing malicious applications to access sensitive user information stored in protected directories such as Documents, Library, and other system-accessible locations. The vulnerability affects not only individual user privacy but also enterprise security posture, as compromised applications could potentially access corporate data stored on devices running affected operating systems. Organizations using Apple devices for business purposes must consider the risk of data exposure through this vulnerability, particularly in environments where applications with elevated permissions are present. The fix implemented in iOS 18 and iPadOS 18 addresses the core issue through enhanced symlink validation mechanisms that properly verify target paths and prevent unauthorized traversal through symbolic link references. The macOS Sequoia 15 update provides similar protections for desktop environments, ensuring consistent security across Apple's mobile and desktop platforms. Security professionals should prioritize patching affected systems and implementing monitoring for suspicious symlink creation patterns that could indicate exploitation attempts.
Mitigation strategies should include immediate deployment of the patched operating system versions across all affected devices, along with monitoring for unusual file access patterns that might indicate exploitation attempts. Organizations should also implement application whitelisting policies to limit which applications can create or manipulate symbolic links within the system. Additional defensive measures include regular security assessments of applications that handle file operations, particularly those with elevated privileges or access to user data. The vulnerability highlights the importance of proper input validation and access control enforcement in preventing privilege escalation attacks, and organizations should review their security policies to ensure that similar weaknesses are not present in other system components. Security teams should also consider implementing behavioral monitoring for suspicious symlink creation activities that could indicate attempts to exploit this vulnerability or similar path traversal flaws.