CVE-2024-27839 is a privacy vulnerability identified in Apple’s iOS and iPadOS platforms that allows a malicious application to determine the current geographic location of the device user without proper authorization. The root cause of the vulnerability is that sensitive location data was stored in a location accessible to unauthorized applications, violating the principle of least privilege and exposing confidential user information. Apple addressed this issue in iOS and iPadOS 17.5 by relocating the sensitive data to a more secure storage area, thereby preventing unauthorized access. The vulnerability is classified under CWE-203 (Information Exposure Through Discrepancy), indicating that the flaw arises from improper handling of sensitive data. The CVSS v3.1 base score is 5.5 (medium severity), with vector AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N, meaning the attack requires local access (local vector), low attack complexity, no privileges, but user interaction is required. The scope is unchanged, and the impact is high on confidentiality but none on integrity or availability. No known exploits have been reported in the wild, suggesting limited active exploitation currently. The vulnerability primarily threatens user privacy by exposing location data, which can be leveraged for tracking or profiling users without consent.

The primary impact of CVE-2024-27839 is the unauthorized disclosure of users’ real-time location information, which compromises user privacy and confidentiality. For individuals, this can lead to stalking, targeted phishing, or other privacy invasions. For organizations, especially those with employees using vulnerable devices, this could result in leakage of sensitive location data related to business operations or personnel movements, potentially aiding adversaries in physical or cyber attacks. Although the vulnerability does not affect system integrity or availability, the breach of location confidentiality can have serious repercussions in sectors such as government, defense, finance, and critical infrastructure where location privacy is paramount. The requirement for local access and user interaction limits large-scale remote exploitation but does not eliminate risk from malicious apps or insiders. The absence of known exploits reduces immediate threat but does not preclude future exploitation attempts.

To mitigate CVE-2024-27839, organizations and users should promptly update all affected Apple devices to iOS and iPadOS version 17.5 or later, where the vulnerability has been fixed by securing the storage location of sensitive data. Beyond patching, organizations should enforce strict app installation policies, limiting apps to those from trusted sources and employing Mobile Device Management (MDM) solutions to control app permissions and monitor for suspicious behavior. Users should be educated to avoid installing untrusted applications and to be cautious with permissions requests, especially those related to location data. Regular audits of installed applications and their permissions can help detect potential misuse. Additionally, enabling system-level privacy features such as location access prompts and reviewing app access logs can provide early warning of suspicious activity. For high-risk environments, consider employing endpoint detection and response (EDR) tools that can detect anomalous app behavior related to location data access.