CVE-2025-43220: Apple iPadOS Information Disclosure Flaw

CVE-2025-43220 Overview

CVE-2025-43220 is a symlink validation vulnerability affecting Apple macOS and iPadOS operating systems. The vulnerability exists due to improper validation of symbolic links, which can allow a malicious application to bypass security controls and access protected user data. This vulnerability was addressed by Apple with improved validation of symlinks in their security updates.

Critical Impact

A malicious application installed on the system may be able to bypass file system protections and access sensitive user data that should otherwise be protected by operating system security controls.

Affected Products

• Apple iPadOS versions prior to 17.7.9
• Apple macOS Sequoia versions prior to 15.6
• Apple macOS Sonoma versions prior to 14.7.7
• Apple macOS Ventura versions prior to 13.7.7

Discovery Timeline

• 2025-07-30 - CVE-2025-43220 published to NVD
• 2025-11-03 - Last updated in NVD database

Technical Details for CVE-2025-43220

Vulnerability Analysis

This vulnerability (CWE-59: Improper Link Resolution Before File Access, commonly known as a "Link Following" vulnerability) occurs when the operating system fails to properly validate symbolic links before allowing file operations. When an application creates or follows a symlink, the system should verify that the target path is within the application's permitted access scope. The improper validation allows malicious applications to create symlinks pointing to protected directories or files, effectively bypassing the sandbox and permission boundaries that protect sensitive user data.

The flaw enables a privilege boundary violation where applications without proper entitlements can potentially access data protected by Transparency, Consent, and Control (TCC) mechanisms or other file system protections in macOS and iPadOS.

Root Cause

The root cause of CVE-2025-43220 is insufficient validation of symbolic link targets during file system operations. When processing symlinks, the affected Apple operating systems did not adequately verify whether the resolved path would lead to protected resources that the requesting application should not have permission to access. This allowed malicious applications to create symlinks that point outside their sandbox container to sensitive locations containing user data, effectively circumventing the intended access control mechanisms.

Attack Vector

The attack vector for this vulnerability is network-based according to the CVSS classification, though exploitation requires a malicious application to be installed and running on the target device. An attacker would need to:

1. Craft a malicious application that creates symbolic links pointing to protected user data directories
2. Distribute this application to target systems (via phishing, malicious websites, or compromised app distribution channels)
3. Once executed, the application exploits the symlink validation flaw to traverse outside its sandbox
4. The malicious app can then read sensitive user data such as photos, documents, contacts, or other protected information

The vulnerability involves exploiting the improper resolution of symbolic links during file system operations. When a malicious application creates a symlink pointing to a protected directory and then attempts to access files through that symlink, the system fails to properly validate that the final resolved path is within the application's permitted access scope. This allows unauthorized data access without user consent or awareness.

Detection Methods for CVE-2025-43220

Indicators of Compromise

• Unusual symlink creation patterns within application sandbox containers pointing to sensitive system directories
• Applications attempting to access protected user data directories (e.g., ~/Library/, Photos, Contacts databases) through indirect paths
• File access audit logs showing unexpected access to TCC-protected resources by unsigned or suspicious applications
• Presence of symbolic links in application containers targeting paths outside the sandbox boundary

Detection Strategies

• Monitor for symlink creation events that point to protected system directories using endpoint detection and response (EDR) tools
• Implement file integrity monitoring on sensitive user data directories to detect unauthorized access attempts
• Review system logs for TCC bypass indicators or unexpected file access patterns from third-party applications
• Deploy behavioral analysis to identify applications exhibiting sandbox escape patterns

Monitoring Recommendations

• Enable advanced audit logging for file system operations, particularly symlink creation and following
• Configure SentinelOne agents to monitor for suspicious file access patterns indicative of symlink-based attacks
• Regularly review installed applications and their file access behaviors using endpoint visibility tools
• Monitor for applications making repeated attempts to access protected data directories

How to Mitigate CVE-2025-43220

Immediate Actions Required

• Update all affected Apple devices to the patched versions: iPadOS 17.7.9, macOS Sequoia 15.6, macOS Sonoma 14.7.7, or macOS Ventura 13.7.7
• Review installed applications and remove any suspicious or untrusted software that could potentially exploit this vulnerability
• Enable automatic updates on all Apple devices to ensure timely deployment of security patches
• Audit applications with broad file system permissions and restrict access where possible

Patch Information

Apple has released security updates addressing this vulnerability across multiple operating system versions. Organizations and users should apply the following updates immediately:

• iPadOS 17.7.9: Apple Security Update 124148
• macOS Sequoia 15.6: Apple Security Update 124149
• macOS Sonoma 14.7.7: Apple Security Update 124150
• macOS Ventura 13.7.7: Apple Security Update 124151

Additional technical details are available in the Full Disclosure Mailing List posts.

Workarounds

• Limit application installations to only those from trusted sources and the official App Store until patches can be applied
• Use Mobile Device Management (MDM) solutions to restrict installation of unsigned or untrusted applications on enterprise devices
• Implement application whitelisting to prevent execution of potentially malicious applications
• Review and restrict file system permissions for applications that do not require broad access

# Check current macOS version
sw_vers -productVersion

# Verify system updates are enabled
defaults read /Library/Preferences/com.apple.SoftwareUpdate AutomaticCheckEnabled

# Enable automatic security updates
sudo defaults write /Library/Preferences/com.apple.SoftwareUpdate CriticalUpdateInstall -bool true