CVE-2017-13839 in macOS
Summary
by MITRE
An issue was discovered in certain Apple products. macOS before 10.13 is affected. The issue involves the "Spotlight" component. It allows local users to see results for other users' files.
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Analysis
by VulDB Data Team • 02/08/2021
The vulnerability identified as CVE-2017-13839 represents a significant privacy and access control flaw within Apple's macOS operating system affecting versions prior to 10.13. This issue specifically targets the Spotlight search functionality, which is a core component designed to provide users with rapid access to files, applications, and information stored on their systems. The flaw manifests as an insufficient privilege check within the Spotlight indexing and search mechanisms, creating an unintended information disclosure channel that compromises user confidentiality and system integrity.
The technical nature of this vulnerability stems from improper access controls within the Spotlight component's implementation. When multiple users operate on the same macOS system, the Spotlight service should maintain strict separation between user data to prevent unauthorized access to files belonging to other system users. However, the flaw allows a local attacker or legitimate user with access to the system to potentially view search results that should be restricted to other users' personal files, effectively bypassing the expected multi-user isolation mechanisms that macOS employs to maintain security boundaries between individual accounts.
This vulnerability directly impacts the principle of least privilege and violates fundamental security concepts related to user isolation and data protection. From an operational standpoint, the impact extends beyond simple information disclosure as it represents a breach in the operating system's core security architecture. The flaw enables unauthorized information gathering that could potentially lead to more sophisticated attacks, as an attacker could use the exposed search results to identify sensitive files, personal documents, or system configurations belonging to other users. This represents a critical weakness in the macOS multi-user security model and undermines user trust in the system's ability to maintain privacy boundaries.
The vulnerability aligns with CWE-284, which addresses improper access control, and reflects weaknesses in the system's privilege management mechanisms. From an attacker's perspective, this flaw could be leveraged as part of a broader exploitation strategy, potentially serving as a reconnaissance tool to gather intelligence before attempting more targeted attacks. The issue demonstrates how seemingly benign system components like search functionality can become attack vectors when proper access controls are not implemented. Organizations and individual users running affected macOS versions should prioritize immediate patching to address this security gap, as the vulnerability remains exploitable for unauthorized information access and could potentially be combined with other weaknesses to escalate privileges or access additional system resources.
The remediation for this vulnerability requires updating to macOS version 10.13 or later, where Apple implemented proper access controls and privilege checks within the Spotlight component. System administrators should ensure all affected devices receive the appropriate security updates and verify that the patch has been successfully applied. Organizations should also consider implementing additional monitoring for unusual Spotlight search patterns that might indicate exploitation attempts, though the primary defense remains the timely application of security patches. This vulnerability serves as a reminder of the critical importance of maintaining up-to-date security configurations and the potential risks associated with insufficient access control implementations in core system services.