# Cis Bind V100 7 3

> Disable the dnssec-accept-expired Option (Automated)

- Skill: `cyberstrikeus/cis-bind-v100-7-3` (Agent Skill)
- Install (CLI): `npx skillmds@latest add cyberstrikeus/cis-bind-v100-7-3`
- Raw SKILL.md: https://api.skillmd.com/api/skills/cyberstrikeus/cis-bind-v100-7-3/raw
- Safety review: PASS (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: cyberstrikeus (https://skillmd.com/u/cyberstrikeus)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/cyberstrikeus/cis-bind-v100-7-3

---


# CIS 7.3 — Disable the dnssec-accept-expired Option

## Profile Applicability

- Caching Only Name Server Level 1
- Authoritative Name Server Level 1

## Description

The `dnssec-accept-expired` option allows BIND to accept expired signatures during validation. The option should be disabled so that expired signatures will not be accepted.

## Rationale

Allowing expired signatures would leave the server vulnerable to replay attacks.

## Impact

Not specified in the PDF.

## Audit Procedure

Verify the `dnssec-accept-expired` option is not present in the configuration files, or is set to a value of `no`.

```
# grep dnssec-accept-expired $CONFIG_FILES
/var/named/chroot/etc/named.conf:     dnssec-accept-expired no;
```

## Remediation

Change the `dnssec-accept-expired` option to have a value of `no`, or remove the option from the configuration files.

## Default Value

The `dnssec-accept-expired` option is disabled by default.

## References

Not specified in the PDF.

## CIS Controls

| Controls Version | Control                                                            | IG 1 | IG 2 | IG 3 |
| ---------------- | ------------------------------------------------------------------ | ---- | ---- | ---- |
| v6               | 9 Limitation and Control of Network Ports, Protocols, and Services | Y    | Y    | Y    |
| v7               | 16.7 Establish Process for Revoking Access                         | Y    | Y    | Y    |

## MITRE ATT&CK Mappings

| Tactic              | Technique                                     |
| ------------------- | --------------------------------------------- |
| Credential Access   | T1557 - Adversary-in-the-Middle               |
| Defense Evasion     | T1550 - Use Alternate Authentication Material |
| Command and Control | T1071.004 - Application Layer Protocol: DNS   |

## Profile

- Level 1 - Caching Only Name Server
- Level 1 - Authoritative Name Server