macOS, Code-Signing Vulnerability, CVE-2025-24109 (Critical)

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How the Mentioned CVE Works:

CVE-2025-24109 is a critical vulnerability in macOS that involves a code-signing downgrade issue. This flaw allows malicious applications to bypass Apple’s code-signing restrictions, potentially gaining unauthorized access to sensitive user data. The vulnerability arises when an app exploits weaknesses in the code-signing validation process, enabling it to execute unsigned or improperly signed code. This can lead to privilege escalation or data exfiltration. Apple addressed this issue in macOS Ventura 13.7.3, macOS Sequoia 15.3, and macOS Sonoma 14.7.3 by implementing stricter code-signing checks and validation mechanisms.

DailyCVE Form:

Platform: macOS
Version: Ventura 13.7.3, Sequoia 15.3, Sonoma 14.7.3
Vulnerability: Code-Signing Bypass
Severity: Critical
Date: 01/27/2025

What Undercode Say:

Exploitation Details:

  1. An attacker crafts a malicious app with improperly signed code.
  2. The app exploits the downgrade vulnerability to bypass code-signing checks.
  3. The app gains access to sensitive user data or system resources.

Protection Measures:

  1. Update macOS to the latest patched versions: Ventura 13.7.3, Sequoia 15.3, or Sonoma 14.7.3.
  2. Enable System Integrity Protection (SIP) to restrict unsigned code execution.
  3. Use Apple’s XProtect and Gatekeeper to block malicious apps.

Commands:

1. Check macOS version:

`sw_vers`

2. Verify SIP status:

`csrutil status`

3. List installed apps and their code-signing status:

`codesign -dv /Applications/AppName.app`

Code Snippet for Code-Signing Verification:

!/bin/bash
APP_PATH="/Applications/AppName.app"
codesign --verify --deep --strict "$APP_PATH"
if [ $? -eq 0 ]; then
echo "Code-signing verification passed."
else
echo "Code-signing verification failed."
fi

References:

  1. Apple Security Updates: https://support.apple.com/en-us/HT201222
  2. NVD CVE Details: https://nvd.nist.gov/vuln/detail/CVE-2025-24109
  3. macOS Developer Documentation on Code-Signing: https://developer.apple.com/documentation/security/code_signing

Analytics:

  • CVSS Score: 9.8 (Critical)
  • Attack Vector: Local
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: Required
  • Scope: Unchanged
  • Confidentiality Impact: High
  • Integrity Impact: High
  • Availability Impact: High

Mitigation Tools:

  1. Use Endpoint Detection and Response (EDR) solutions to monitor for suspicious app behavior.

2. Regularly audit installed applications for code-signing compliance.

  1. Implement network segmentation to limit lateral movement in case of exploitation.

References:

Reported By: https://nvd.nist.gov/vuln/detail/CVE-2025-24109
Extra Source Hub:
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