CVE-2025-24104 is a vulnerability in Apple iOS and iPadOS related to the restoration process of backup files. Specifically, the issue stems from inadequate handling of symbolic links (symlinks) within backup archives. When a user restores a backup containing maliciously crafted symlinks, the system may inadvertently modify protected system files, which are normally safeguarded against unauthorized changes. This vulnerability is classified under CWE-59 (Improper Link Resolution Before File Access), indicating a failure to properly validate or handle symbolic links before file operations. The attack vector requires local access to the device and user interaction to initiate the restoration of the malicious backup. No privileges or authentication are required to exploit this vulnerability, but the user must consent to restore the backup. The impact is limited to integrity, as the attacker can alter system files, potentially leading to persistent unauthorized changes or enabling further exploitation. Confidentiality and availability are not directly affected. Apple has fixed this vulnerability by improving symlink handling in iOS 18.3, iPadOS 18.3, and iPadOS 17.7.4. The CVSS v3.1 base score is 5.5 (medium severity), reflecting the local attack vector, low complexity, no privileges required, but user interaction needed and limited scope. No known exploits have been reported in the wild to date.

The primary impact of CVE-2025-24104 is the unauthorized modification of protected system files on iOS and iPadOS devices. This can undermine the integrity of the operating system, potentially allowing attackers to implant persistent malicious code, alter system behavior, or bypass security controls. For organizations, this could lead to compromised devices that evade detection or facilitate further attacks such as privilege escalation or data manipulation. Although confidentiality and availability are not directly impacted, the integrity breach can have cascading effects on device trustworthiness and security posture. The requirement for user interaction and local access limits large-scale remote exploitation but does not eliminate risk, especially in environments where devices are shared, or backups are restored from untrusted sources. Enterprises relying on iOS/iPadOS devices for sensitive operations should consider the risk of compromised system integrity and potential lateral movement within their networks.

To mitigate CVE-2025-24104, organizations and users should: 1) Immediately update all iOS and iPadOS devices to versions 18.3, 17.7.4, or later where the vulnerability is patched. 2) Avoid restoring backups from untrusted or unknown sources to prevent introduction of malicious symlinks. 3) Implement strict backup management policies, including verifying the integrity and origin of backup files before restoration. 4) Educate users about the risks of restoring backups from suspicious sources and the importance of applying system updates promptly. 5) Employ mobile device management (MDM) solutions to enforce update compliance and restrict unauthorized backup restoration where feasible. 6) Monitor device behavior post-restore for anomalies indicating potential system file tampering. 7) Consider additional endpoint protection mechanisms that can detect unauthorized file system changes on iOS/iPadOS devices. These steps go beyond generic patching by emphasizing backup source validation and user awareness to reduce exploitation likelihood.