CVE-2024-44258 Overview
CVE-2024-44258 is a symlink handling vulnerability [CWE-59] affecting Apple iOS, iPadOS, tvOS, and visionOS. Restoring a maliciously crafted backup file can lead to modification of protected system files. The flaw resides in how the operating system processes symbolic links during backup restoration operations.
Apple addressed the issue in iOS 17.7.1, iPadOS 17.7.1, iOS 18.1, iPadOS 18.1, tvOS 18.1, and visionOS 2.1 through improved symlink handling. Exploitation requires local access and user interaction to restore the attacker-supplied backup. Successful exploitation undermines system file integrity protections enforced by the Apple platform.
Critical Impact
An attacker who convinces a user to restore a crafted backup can modify protected system files, bypassing platform integrity guarantees on iOS, iPadOS, tvOS, and visionOS devices.
Affected Products
- Apple iOS and iPadOS versions prior to 17.7.1 and prior to 18.1
- Apple tvOS versions prior to 18.1
- Apple visionOS versions prior to 2.1
Discovery Timeline
- 2024-10-28 - CVE-2024-44258 published to NVD
- 2026-04-02 - Last updated in NVD database
Technical Details for CVE-2024-44258
Vulnerability Analysis
The vulnerability is classified as a Link Following weakness [CWE-59], commonly referred to as a symlink attack. The Apple operating system fails to properly validate symbolic links contained within backup archives during restoration. An attacker crafts a backup file with embedded symlinks pointing to protected system locations. When the device processes the malicious archive, file write operations follow the symlinks and land on paths that would normally be inaccessible.
This breaks the integrity guarantees the platform enforces around protected system files. The attack vector is local and requires user interaction, but no privileges are needed to deliver the malicious backup. Integrity and availability impact are high, while confidentiality is not directly affected.
Root Cause
The root cause is improper handling of symlinks during the backup restoration workflow. Restoration logic resolves link targets without sufficient validation against the destination policy that protects system directories. Apple's advisory states the fix involved improved handling of symlinks.
Attack Vector
An attacker prepares a crafted backup file containing symbolic links that reference protected system paths. The victim restores this backup onto a vulnerable device through standard restore tooling. During restoration, write operations traverse the malicious symlinks and modify files in locations protected by the operating system. Technical details have been discussed publicly on the Full Disclosure mailing list, including posts archived in Full Disclosure October 9, October 10, October 15, and October 16.
No verified proof-of-concept code is published in the enriched data. Refer to the linked disclosures and Apple advisories for technical specifics.
Detection Methods for CVE-2024-44258
Indicators of Compromise
- Unexpected backup restoration events on managed Apple devices, especially from non-corporate sources.
- Modifications to system-protected files following a recent restore operation.
- Backup archives containing symbolic link entries that resolve outside the expected user-data namespace.
Detection Strategies
- Inspect backup archives for embedded symlink entries that reference absolute paths or system directories prior to restoration.
- Monitor mobile device management (MDM) telemetry for unauthorized restore activity and OS version drift below patched builds.
- Correlate device integrity attestation results with recent restore events to identify post-restore tampering.
Monitoring Recommendations
- Maintain an inventory of Apple device OS versions and flag any device running iOS, iPadOS below 17.7.1 or 18.1, tvOS below 18.1, or visionOS below 2.1.
- Alert on user-initiated restores from unmanaged backup sources via MDM compliance policies.
- Review enterprise backup repositories for archives sourced from untrusted users before allowing restoration.
How to Mitigate CVE-2024-44258
Immediate Actions Required
- Update affected devices to iOS 17.7.1, iPadOS 17.7.1, iOS 18.1, iPadOS 18.1, tvOS 18.1, or visionOS 2.1 or later.
- Block restoration of backup archives originating from untrusted sources through MDM restore restrictions.
- Audit recently restored devices for evidence of protected system file modification.
Patch Information
Apple has released fixes that address CVE-2024-44258 through improved symlink handling. Refer to the vendor advisories: Apple Support Document #121563, Apple Support Document #121566, Apple Support Document #121567, and Apple Support Document #121569.
Workarounds
- Restore only from backups created on trusted, managed devices and stored in controlled locations.
- Enforce MDM policies that prevent users from restoring devices from local or third-party backup files.
- Re-image any device suspected of having processed an untrusted backup rather than performing in-place remediation.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
