Cis Cassandra40 V100 5.1

---
name: cis-cassandra40-v100-5.1
description: "Inter-node Encryption"
category: cis-cassandra
version: "1.0.0"
author: cyberstrike-official
tags: [cis, cassandra, encryption, tls, ssl]
cis_id: "5.1"
cis_benchmark: "CIS Apache Cassandra 4.0 Benchmark v1.0.0"
tech_stack: [cassandra]
cwe_ids: []
chains_with: []
prerequisites: []
severity_boost: {}
---

# 5.1 Inter-node Encryption

## Profile Applicability

- Level 1 - Cassandra on Linux

## Description

Cassandra offers the option to encrypt data in transit between nodes on the cluster. By default, inter-node encryption is turned off.

## Rationale

Data being transferred on the wire should be encrypted to avoid network snooping, whether legitimate or not.

## Audit

Run the following command to verify whether inter-node encryption is enabled.

```bash
cat cassandra.yaml | grep -in "internode_encryption:"
```

Acceptable values are `all`, `dc` or `rack`. If the `internode_encryption` is set to `none`, this is a finding.
Note: The Cassandra configuration files can be found in the conf directory of tarballs. For packages, the configuration files will be located in /etc/cassandra.

## Remediation

The inter-node encryption should be implemented before anyone accesses the Cassandra server.
To enable the inter-node encryption mechanism:

1. Stop the Cassandra database.
2. If not done so already, build out your keystore and truststore.
3. Modify cassandra.yaml file to modify/add entry for internode_encryption: set it to `all`
4. Start the Cassandra database.

## Default Value

```
internode_encryption: none
```

## References

1. http://cassandra.apache.org/doc/latest/operating/security.html

## CIS Controls

- **v8 3.10** Encrypt Sensitive Data in Transit
  - Encrypt sensitive data in transit. Example implementations can include: Transport Layer Security (TLS) and Open Secure Shell (OpenSSH).
- **v7 14.4** Encrypt All Sensitive Information in Transit
  - Encrypt all sensitive information in transit.

## Profile

- Level 1 - Cassandra on Linux | Automated