About

Imported from CyberStrikeus/CyberStrike (.cyberstrike/skill/CIS_benchmarks/Server_Software/Bind/cis-isc-bind-dns-server-9-11-benchmark/cis-bind-v100-3-1/SKILL.md). Install upstream with npx skills add CyberStrikeus/CyberStrike --skill cis-bind-v100-3-1. Copyright stays with the author.

CIS 3.1 — Ignore Erroneous or Unwanted Queries

Name: cis-bind-v100-3-1
Author: CyberStrikeus

Profile Applicability

Authoritative Name Server Level 1
Caching Only Name Server Level 1

Description

BIND can be configured to ignore requests originating from specified network segments. This is accomplished by implementing the blackhole option in named.conf. It is recommended that this feature be implemented to ignore requests that originate outside of expected network segments.

Rationale

By ignoring traffic that originates from unexpected networks, the server's exposure to malicious entities is reduced.

Impact

Not specified in the PDF.

Audit Procedure

Attempt to query the server from an address that has been placed in the blackhole list. If properly configured, the query will fail.

nslookup www.google.com ns1.example.com

Remediation

Add a blackhole option for multicast and link local addresses, and all private RFC 1918 addresses that are not being used.

blackhole {
     // Private RFC 1918 addresses
     10/8; 192.168/16; 172.16/12;
     // Multicast
     224/8;
     // Link Local
     169.254/16;
};

Default Value

No networks are blackhole'd 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	9 Limitation and Control of Network Ports, Protocols, and Services	Y	Y	Y

MITRE ATT&CK Mappings

Tactic	Technique
Defense Evasion	T1562 - Impair Defenses
Initial Access	T1190 - Exploit Public-Facing Application

Profile

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

Use it

Copy one of these into your project. Installing also returns the manifest and these snippets.

yaml

targets:
  - https://api.opensmartroute.ai/api/v1/registry/cyberstrikeus-cyberstrike-cis-bind-v100-3-1/manifest   # or paste the manifest below

Manifest

An Open Capability Manifest: the router reads it to know what this does, what it costs and when to pick it.

cyberstrikeus-cyberstrike-cis-bind-v100-3-1.ocm.jsonjson

{
  "ocm": "1",
  "id": "cyberstrikeus-cyberstrike-cis-bind-v100-3-1",
  "kind": "skill",
  "name": "cis-bind-v100-3-1",
  "description": "Ignore Erroneous or Unwanted Queries (Automated)",
  "publisher": "CyberStrikeus",
  "version": "1.0.0",
  "capabilities": {
    "domains": [
      "general"
    ],
    "tags": [
      "skill-md",
      "cis",
      "bind",
      "dns",
      "isc-bind",
      "bind9",
      "restricting-queries",
      "github"
    ],
    "languages": [
      "en"
    ]
  },
  "quality_prior": 0.6,
  "examples": [
    "Ignore Erroneous or Unwanted Queries (Automated)"
  ],
  "primary": false,
  "metadata": {
    "source": {
      "provider": "github",
      "repository": "https://github.com/CyberStrikeus/CyberStrike",
      "path": ".cyberstrike/skill/CIS_benchmarks/Server_Software/Bind/cis-isc-bind-dns-server-9-11-benchmark/cis-bind-v100-3-1/SKILL.md",
      "ref": "df28ccd3dc6d6c02391169121ee2dcdf4a6a132b",
      "url": "https://github.com/CyberStrikeus/CyberStrike/blob/df28ccd3dc6d6c02391169121ee2dcdf4a6a132b/.cyberstrike/skill/CIS_benchmarks/Server_Software/Bind/cis-isc-bind-dns-server-9-11-benchmark/cis-bind-v100-3-1/SKILL.md",
      "key": "CyberStrikeus/CyberStrike/.cyberstrike/skill/CIS_benchmarks/Server_Software/Bind/cis-isc-bind-dns-server-9-11-benchmark/cis-bind-v100-3-1/SKILL.md"
    }
  },
  "instructions": "# CIS 3.1 — Ignore Erroneous or Unwanted Queries\n\n## Profile Applicability\n\n- Authoritative Name Server Level 1\n- Caching Only Name Server Level 1\n\n## Description\n\nBIND can be configured to ignore requests originating from specified network segments. This is accomplished by implementing the `blackhole` option in `named.conf`. It is recommended that this feature be implemented to ignore requests that originate outside of expected network segments.\n\n## Rationale\n\nBy ignoring traffic that originates from unexpected networks, the server's exposure to malicious entities is reduced.\n\n## Impact\n\nNot ",
  "cost": {
    "context_tokens": 515
  }
}

Fetch it by URL: GET /api/v1/registry/cyberstrikeus-cyberstrike-cis-bind-v100-3-1/manifest?version=1.0.0

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