CVE-2025-43508: macOS Tahoe Information Disclosure Flaw

CVE-2025-43508 Overview

CVE-2025-43508 is an information disclosure vulnerability in macOS Tahoe caused by improper data redaction in system logging mechanisms. The vulnerability allows a local application to access sensitive user data through inadequately sanitized log entries. Apple addressed this logging issue with improved data redaction in macOS Tahoe 26.1.

Critical Impact

A malicious or compromised application running on an affected macOS system can access sensitive user data that was improperly logged, potentially exposing personal information, credentials, or other confidential data.

Affected Products

• macOS Tahoe versions prior to 26.1
• Apple systems running vulnerable macOS Tahoe builds

Discovery Timeline

• 2026-01-16 - CVE-2025-43508 published to NVD
• 2026-01-16 - Last updated in NVD database

Technical Details for CVE-2025-43508

Vulnerability Analysis

This vulnerability is classified under CWE-532 (Insertion of Sensitive Information into Log File). The core issue stems from macOS Tahoe's logging subsystem failing to properly redact sensitive user information before writing it to log files. When applications or system processes handle sensitive data, the logging framework may inadvertently capture and persist this information in plaintext within system logs.

The local attack vector requires an attacker to have code execution on the target system. Once a malicious application is running, it can read system logs or leverage the logging mechanism to extract sensitive user data that should have been redacted. This represents a confidentiality breach where user privacy is compromised through improper information handling.

Root Cause

The root cause lies in insufficient data redaction logic within macOS Tahoe's logging framework. When sensitive user data flows through various system components, the logging subsystem failed to apply appropriate filtering or masking before persisting log entries. This oversight allowed sensitive information such as user credentials, personal identifiers, or private application data to be written to accessible log files.

Attack Vector

The attack requires local access to the system. An attacker would need to execute a malicious application on the target macOS device, which could be achieved through social engineering, supply chain compromise, or exploitation of another vulnerability. Once running, the malicious app can:

1. Read existing log files containing unredacted sensitive data
2. Trigger logging operations that expose sensitive information
3. Monitor log entries in real-time to capture newly logged sensitive data

The vulnerability exploitation mechanism involves reading system logs that contain improperly redacted sensitive user information. No code example is provided as the exploitation involves standard file system access to log files. For technical details, refer to the Apple Support Article.

Detection Methods for CVE-2025-43508

Indicators of Compromise

• Unusual log file access patterns by non-system applications
• Applications attempting to read system log directories outside their normal scope
• Elevated file access events targeting /var/log/ or unified logging databases
• Process activity correlating with log enumeration and exfiltration behavior

Detection Strategies

• Monitor for applications accessing system log files using file access auditing
• Implement endpoint detection rules for processes reading unified logging data
• Deploy behavioral analysis to detect applications with anomalous log file access patterns
• Review application sandboxing and entitlements to identify apps with excessive log access permissions

Monitoring Recommendations

• Enable audit logging for file access events targeting system log directories
• Implement SentinelOne behavioral AI to detect suspicious application behavior patterns
• Configure alerts for unauthorized attempts to access logging subsystem APIs
• Regularly audit installed applications for excessive permissions or suspicious log access behavior

How to Mitigate CVE-2025-43508

Immediate Actions Required

• Update macOS Tahoe to version 26.1 or later immediately
• Review installed applications and remove any untrusted or unnecessary software
• Audit existing log files for potential sensitive data exposure
• Enable SentinelOne agent protection on all macOS endpoints to detect malicious application behavior

Patch Information

Apple has addressed this vulnerability in macOS Tahoe 26.1 by implementing improved data redaction within the logging framework. The patch ensures sensitive user data is properly sanitized before being written to log files. System administrators should deploy this update to all affected systems as soon as possible. For complete patch details, refer to the Apple Support Article.

Workarounds

• Restrict application installations to trusted sources only (Mac App Store or verified developers)
• Implement strict application whitelisting policies on enterprise systems
• Enable macOS Gatekeeper and ensure it is not bypassed
• Use SentinelOne's application control features to prevent execution of untrusted applications

# Check current macOS version
sw_vers -productVersion

# Verify system is updated to macOS Tahoe 26.1 or later
softwareupdate --list

# Apply available updates
softwareupdate --install --all