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How CVE-2025-31249 Works
This vulnerability stems from a logic flaw in macOS Sequoia’s sandboxing mechanism, allowing malicious apps to bypass file access restrictions. Improper validation of app enments enables unauthorized access to sensitive user data, such as keychain items or private documents. The flaw occurs when handling dynamic library loading, where a crafted app can exploit weak path sanitization to escalate privileges. Attackers leverage this to read or modify protected data without user consent. Apple addressed this in version 15.5 by enforcing stricter enment checks and isolating library-loading routines.
DailyCVE Form
Platform: macOS
Version: <15.5
Vulnerability: Data exposure
Severity: Critical
Date: 05/12/2025
Prediction: Patch expected by 06/10/2025
What Undercode Say:
Exploit Analysis:
1. Craft a malicious app with fake enments.
2. Use `DYLD_INSERT_LIBRARIES` to inject code.
3. Bypass `sandbox-exec` restrictions via path traversal.
Protection Commands:
Verify macOS version:
sw_vers -productVersion
Disable untrusted apps:
sudo spctl --master-enable
Monitor library injections:
sudo dtrace -n 'syscall::posix_spawn:entry { trace(copyinstr(arg1)); }'
Code Snippet (Detection):
import os
def check_enments(pid):
return os.popen(f"codesign -dv --enments :- {pid}").read()
if "com.apple.private.security" not in check_enments(1234):
print("Suspicious enments detected!")
Mitigation Steps:
1. Update to macOS 15.5+.
2. Revoke unnecessary app enments.
3. Audit `DYLD` environment variables.
Log Analysis:
grep -r "DYLD_" /var/log/system.log
Apple’s Patch Notes:
- Fixed enment validation in
libsystem_secinit.dylib. - Restricted `posix_spawn` with hardened runtime flags.
Impact Metrics:
- CVSS:4.0 9.8 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).
- Exploitability: High (PoC likely within 30 days).
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
