# Cis Cassandra40 V100 3.5

> Cis Cassandra40 V100 3.5 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.

Ensure that Cassandra only listens for network connections on authorized interfaces

- Skill name: `cis-cassandra40-v100-3.5`
- 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_4.0_Benchmark_v1.0.0/cis-cassandra40-v100-3.5/SKILL.md
- Repository: CyberStrikeus/CyberStrike (1,211 GitHub stars when collected)

## SKILL.md

# 3.5 Ensure that Cassandra only listens for network connections on authorized interfaces

## Profile Applicability

- Level 1 - Cassandra on Linux

## Description

When `listen_address` is blank and `listen_interface` is commented out, this will be set automatically by `InetAddress.getLocalHost()`. Presuming the node is configured correctly, e.g. hostname, name resolution, etc., this will configure the node to use the address associated with the hostname. The `listen_address` must not be set to 0.0.0.0.

## Rationale

Setting the address or interface to bind to will tell other Cassandra nodes to which address or interface to connect. This must be changed from the default in order for multiple nodes to be able to communicate.

## Audit

Check the value of `listen_address` or `listen_interface` in the cassandra.yaml. If `listen_address` is set 0.0.0.0 or a non-authorized address or interface is specified, this is a finding.

## Remediation

Set the `listen_address` or `listen_interface`, not both, in the cassandra.yaml to an authorized address or interface.

## Default Value

```
listen_address: localhost
```

```
listen_interface: eth0
```

but is commented out by default.

## References

1. http://cassandra.apache.org/doc/3.11/configuration/cassandra_config_file.html#listen-address
2. http://cassandra.apache.org/doc/3.11/configuration/cassandra_config_file.html#listen-interface

## CIS Controls

- **v8 4.4** Implement and Manage a Firewall on Servers
  - Implement and manage a firewall on servers, where supported. Example implementations include a virtual firewall, operating system firewall, or a third-party firewall agent.
- **v7 9.2** Ensure Only Approved Ports, Protocols and Services Are Running
  - Ensure that only network ports, protocols, and services listening on a system with validated business needs, are running on each system.

## Profile

- Level 1 - Cassandra on Linux | Manual

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Source: https://www.openparable.com/skill/devops-security/cis-cassandra40-v100-3-5 (OpenParable). Cite the canonical URL above.