# Cis Cassandra41 5.1

> Cis Cassandra41 5.1 is an Agent Skill for devops & security published in the CyberStrikeus/CyberStrike repository on GitHub: a SKILL.md instruction file an AI agent can load to do this task.

Inter-node Encryption

- Skill name: `cis-cassandra41-5.1`
- Category: [DevOps & Security](https://www.openparable.com/skill/devops-security/1)
- Source: https://github.com/CyberStrikeus/CyberStrike/blob/HEAD/.cyberstrike/skill/CIS_benchmarks/Server_Software/Apache_Cassandra/CIS_Apache_Cassandra_4.1_Benchmark_v1.0.0/cis-cassandra41-5.1/SKILL.md
- Repository: CyberStrikeus/CyberStrike (1,211 GitHub stars when collected)

## SKILL.md

# 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 | Automated

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